Vietnam in September: Weather Info & Best Time to Go (2025)
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Thinking about jetting off to Vietnam in September? You’re in luck, I live in Vietnam (and have for the last 7 years) and am ready to share everything I know about visiting Vietnam in September.
September brings a subtle shift in the weather across Vietnam, slowly exiting the rainy season in certain parts. In this article I will take you through the typical weather in September, the holidays and events worth celebrating, and the best places to visit this month.
Ready to travel to Vietnam in September? Let’s do it.
Typical Vietnam Weather in September

September in Vietnam is a transitional month where the weather starts to shift from rainy to drier days, especially towards the end. You’ll still get rain, but the frequency and intensity begin to lessen compared to August.
North Vietnam Weather in September
Heading to the north? In Hanoi and its surroundings the weather is beginning to cool down a bit, with temperatures ranging between 24°C to 31°C (75°F to 88°F). It’s less humid, and while you might still need your umbrella for occasional showers, the rain is less frequent. This makes it a great time to explore the outdoor beauty without the heavier downpours of the earlier summer months.
Central Vietnam Weather in September
Central Vietnam is where you’ll find the best weather in September. Places like Hoi An and Da Nang see less rain and more sunny days. Temperatures are comfortable, hanging at around 25°C to 32°C (77°F to 90°F), perfect for beach days and exploring the ancient streets of central cities. Rainfall is occasional and usually doesn’t last long.
Southern Vietnam Weather in September
In the south, the rainy season begins to taper off, but you’ll still experience frequent showers. Temperatures in places like Ho Chi Minh City range from 24°C to 31°C (75°F to 88°F). The rain usually comes in quick bursts in the afternoon, so it’s easy to plan around it. Mornings are generally clear and sunny, perfect for exploring.
Rainfall in September in Vietnam
September sees a noticeable reduction in rain across Vietnam. However, it is still the rainy season, so prepare for some wet days!
Northern Vietnam: About 10 to 12 rainy days.
Central Vietnam: Around 6-8 days of light, brief showers.
Southern Vietnam: Still rainy with about 18 to 20 days, but showers are shorter.
Air Quality in Vietnam in September (AQI)
While air quality may not typically be part of your travel planning checklist, it’s an important factor to keep in mind when visiting Vietnam.
Vietnam has significant air quality issues, ranking 36th among 118 countries in 2021 for having some of the poorest air conditions. The main contributors to this pollution include motor vehicles, industrial emissions, construction dust, agricultural burning, small-scale manufacturing, and inefficient waste management systems. For a more detailed understanding of air quality specifics in Vietnam, you might refer to information available through the World Health Organization.
The Air Quality Index (AQI) is a measure which uses color codes and numbers to reflect the daily air quality. This can help you plan your activities, especially on days when outdoor exposure might not be so good.

To stay updated on the air quality during your visit, I recommend using resources like the IQAir website or app. You can also just google “AQI in X” and there will be different air meters for different parts of the city you can check.
Even though brief visits are unlikely to pose serious health risks, the presence of pollutants can bring your trip down, especially if you have other conditions like asthma.
With the rainy season winding down, September can bring better air quality days, particularly after rains when the dust and pollutants have settled. Here’s a quick rundown:
Northern Vietnam: Generally moderate to good. The post-rain freshness helps clear the air, offering clearer skies and better breathing conditions.
Central Vietnam: Continues to enjoy good air quality. The coastal breezes coupled with less frequent rains help maintain a cleaner atmosphere.
Southern Vietnam: The air quality begins to improve with less humidity to trap pollutants. Expect moderate AQI, improving right after the rains.
Pros and Cons of Visiting Vietnam in September
| Pros | Cons |
| Less Rainy Days: Especially in the central and northern regions, the frequency of rain decreases, making it more comfortable for sightseeing and outdoor activities. | Residual Rain: Despite the decrease, rain is still a factor, particularly in southern Vietnam, which can occasionally disrupt plans. |
| Cooler Temperatures: The intense heat of the summer begins to subside, especially in the north, making it more pleasant to explore the cities and countryside. | Variable Weather: The weather can be unpredictable across different regions, with sudden changes that might require flexible travel plans. |
| Lower Tourist Numbers: With the peak tourist season winding down, you’ll encounter fewer crowds, providing a more authentic experience and better access to attractions. | Humidity: Even as the rainy season tapers off, the humidity can still be quite high, which might be uncomfortable for some visitors. |
| Improved Air Quality: Post-rain freshness helps to clear the air, particularly in northern and central Vietnam, leading to better air quality and clearer skies. | Peak Rainy Season in the South: Early September can still be quite wet in southern regions like Ho Chi Minh City, with frequent afternoon showers. |
| Scenic Beauty: The end of the rainy season means lush, vibrant landscapes that are perfect for photography and nature lovers. | Transition Month: As a transitional period, September might not offer the full advantages of either the rainy or dry seasons, leading to a mixed experience. |
Holidays in Vietnam in September

National Day
What is National Day?
If you’re hitting up Vietnam in September, you’ve timed it perfectly to catch National Day on the 2nd. This big deal of a holiday marks Vietnam’s independence from France back in 1945. It’s a major event with a lot of history behind it.
How do Vietnamese Celebrate National Day?
During National Day, Vietnam really shows its colors. In big cities like Hanoi, massive military parades are a common sight, especially around Ba Dinh Square where the independence was declared. Besides the formal stuff, there are plenty of parades, fireworks, and live music to catch throughout the city. It’s a great chance to see how locals celebrate their national pride.
What Does it Mean for Travelers to Vietnam?
As a traveler, this is your chance to see Vietnam in full swing. The public celebrations are a cool way to experience a holiday in Vietnam. Just a heads up, since it’s a public holiday, many shops and services might shut down, so plan ahead for that.
The places can get pretty crowded too, thanks to all the events and the general buzz, and you might bump into more security than usual. But really, it just adds to the whole atmosphere. Join in, have fun, and see a different side of Vietnam while you’re at it!
Mid Autumn Festival
The Mid Autumn festival could also be referred to as “Tet Light”. Tet is the biggest Vietnamese holiday that falls in January/February. The mid-autumn festival has a lot of the same celebrations as Tet, just not as intense.
What is the Mid-Autumn Festival?
The Mid-Autumn Festival, also known as the Moon Festival will happen this year on September 17, 2024. It’s an important festival in Vietnam, primarily celebrating the end of the autumn harvest and focusing on family reunions.
How do Vietnamese Celebrate the Mid-Autumn Festival?
The Mid-Autumn Festival in Vietnam is like a blend of Thanksgiving and Halloween. Streets light up with colorful lanterns, and there’s a lot of traditional music and lion dance performances.
Kids parade around with beautifully crafted lanterns of different shapes and sizes. Families gather for a feast which includes mooncakes—a dense, sweet pastry typically filled with lotus seed paste or red bean with an egg yolk in the center, symbolizing the moon.
What Does it Mean for Travelers to Vietnam?
For travelers, the Mid-Autumn Festival is a fantastic opportunity to experience Vietnamese culture hands-on. You can try various mooncakes (which are everywhere) from street vendors to high-end bakeries. Many local communities host events where you can join in the festivities and even try making your own lantern.
It’s a busy time, so while the streets are full of energy, transport and accommodations can get a bit hectic. It is not nearly as popular as Tet, so you don’t have to worry about huge disruptions to your travel plans. Just make sure to book your stay early and be ready for some crowds!
Best Places to Visit in September
September is a solid choice for a time to explore Vietnam. The weather is transitioning and some cool festivals are happening. Here’s a rundown of the best places to visit and why they’re great this time of year:
Hanoi in September

Start with Hanoi, the capital. September brings slightly cooler temperatures and less rain, making it perfect for exploring the city’s rich history and street food scene. Don’t miss the Old Quarter and Hoan Kiem Lake.
Weather in Hanoi in September
If you’re headed to Hanoi in September, you’re in for some mostly decent weather. The city starts to cool down a bit with the end of summer, so you can expect temperatures to range from about 24°C to 31°C (75°F to 88°F).
It’s still a bit humid, but not overwhelmingly so.
Rain is on the decline, though you might still experience occasional showers—mostly brief and refreshing, rather than day-long downpours.
The air quality in Hanoi in September is generally good as the rains help clear the air of pollutants, making it a better time for outdoor activities compared to the sweltering summer months.
The Best Thing to Do in Hanoi in September
One of the best things to do in Hanoi during September is to explore the Old Quarter on foot. With the cooler and less humid weather, wandering around the maze of streets filled with shops, street food stalls, and historic buildings is a lot more comfortable.
This is also a great time to enjoy some of Hanoi’s outdoor cafes, spend a fun night on beer street, and wander the night markets.
Why You Should or Shouldn’t Visit Hanoi in September
Why You Should Visit: September is a sweet spot for visiting Hanoi. The weather is much more manageable than the hotter, rainier summer months. You get to enjoy the lush, post-rain greenery of the city without the extreme heat. It’s also less crowded with tourists compared to peak times, so you’ll have a more laid-back experience and easier access to popular sites.
Why You Might Not Want to Visit: If you prefer a completely dry holiday or are particularly sensitive to humidity, September might still pose a challenge. The city is transitioning from the rainy season, so unexpected showers can still pop up.
Halong Bay in September

Consider a cruise in Halong Bay this month. The weather starts to clear up in September, so you can enjoy those stunning limestone cliffs and emerald waters without too much rain. The sunset views from a junk boat are something you shouldn’t miss (no matter what time of year you are visiting).
Weather in Halong Bay in September
September brings a gentle shift towards cooler and drier weather in Halong Bay, making it one of the more pleasant times for a visit. The temperatures range from 25°C to 30°C (77°F to 86°F), offering a comfortable climate without the stifling heat of midsummer.
While the rain is reducing, occasional showers are still possible, generally brief and less frequent as the month progresses. The humidity begins to drop, which can make your activities more enjoyable.
The Best Thing to Do in Halong Bay in September
Taking a cruise through Halong Bay is the ultimate September activity. With the weather becoming milder and the summer crowds dwindling, you’ll find the bay more serene and accessible.
Cruising around the limestone karsts and islets at this time means awesome photo opportunities, especially as the less frequent rain can lead to clearer skies.
Most cruises will have kayaking as part of their itinerary, which is a fantastic way to get up close with the bay’s natural beauty.
Why You Should or Shouldn’t Visit Halong Bay in September
Why You Should Visit: September is a transitional month for Halong Bay, where the benefits of both summer and autumn blend together. You have the warmth needed for swimming and water activities without the overwhelming crowds or heat.
Why You Might Not Want to Visit: If you’re unlucky, you might still catch some of the tail-end of the rainy season, which can occasionally disrupt cruise itineraries with rough seas or lead to cancellations of outdoor activities. Also, as September still falls within the typhoon season for the region, there’s a small risk of encountering stormy weather, which requires flexibility in travel plans.
Hue in September

Hue is a must-visit for history buffs. The Imperial City, with its palaces and shrines, is less crowded in September. The weather is a bit cooler, making your exploration of the ancient ruins more comfortable.
Weather in Hue in September
Visiting Hue in September means experiencing a shift towards cooler and more manageable weather. The temperatures will range from 24°C to 34°C (75°F to 93°F), which are still warm but less oppressive than the summer months. Rainfall is decreasing, but you might still experience some occasional showers, particularly in the early part of the month.
The humidity also starts to drop, which makes exploring the outdoors more comfortable.
The Best Thing to Do in Hue in September
Exploring the Imperial City is a must-do in Hue, and September’s cooler weather makes wandering through this vast historical site much more enjoyable. The Imperial City, is a UNESCO World Heritage Site and is where you can get a glimpse into the lives of the ancient emperors of Vietnam.
Why You Should or Shouldn’t Visit Hue in September
Why You Should Visit: September is a good time to visit Hue as the weather is becoming better for exploring. The decrease in both heat and rain means more comfortable conditions for visiting outdoor attractions. It’s also not peak tourist season, you’ll get fewer crowds, allowing for a more relaxed exploration of the city’s history and sites.
Why You Might Not Want to Visit: While the weather is generally improving, September can still be somewhat unpredictable with occasional heavy showers, especially early in the month. If you prefer a trip with guaranteed dry days, you might find this slightly off-putting.
Hoi An in September

Hoi An is an excellent choice for September in Vietnam. The town is less crowded, and the weather is ideal for walking through the lantern-lit streets. Make sure to catch the Mid-Autumn Festival here, it is a good place for experiencing the culture!
Weather in Hoi An in September
In September in Hoi An you can expect temperatures to range from 24°C to 34°C (75°F to 93°F), which feels quite warm, but it’s a bit cooler compared to the scorching summer months.
The rainfall is not too much, though occasional showers are still common, usually occurring in the late afternoon or evening.
Humidity starts to decrease as the month progresses, making outdoor activities more comfortable.
The Best Thing to Do in Hoi An in September
In September, explore the Ancient Town of Hoi An. This UNESCO World Heritage Site is exceptionally charming in the milder weather of early fall. Walking through the old streets, you’ll see the town lit up with colorful lanterns.
September also coincides with the Mid-Autumn Festival, and Hoi An celebrates this event beautifully. Participating in the festival activities, including lantern floating, mooncake tasting, and watching traditional performances, offers a unique cultural experience.
Why You Should or Shouldn’t Visit Hoi An in September
Why You Should Visit: September is a fantastic time to visit Hoi An for several reasons. The weather is more comfortable, with cooler temperatures and reduced humidity. The Mid-Autumn Festival will let you experience the culture a bit deeper. Also, there are less tourists after the peak summer season means less crowding and often better deals on accommodation and services.
Why You Might Not Want to Visit: The main drawback of visiting Hoi An in September could be the unpredictable weather patterns, with potential for sudden rain showers. If you prefer to avoid any rain during your travels, this might be a concern. Also, while the Mid-Autumn Festival is a draw for many, it can mean some crowded events and busy public spaces, especially during festival nights.
Da Nang in September

If you’re going to Hoi An in September (which you should) then you definitely need to hit the beaches of Da Nang. The weather is still warm enough for swimming but with fewer rain showers, making it perfect for beach days. Check out the Marble Mountains and the Dragon Bridge as well.
Weather in Da Nang in September
September in Da Nang is the beginning of a transition towards cooler and more pleasant weather conditions. The temperatures during this month range from 24°C to 34°C (75°F to 93°F), making it warm but not excessively hot. Rainfall is present, but not so much compared to the peak rainy months.
The Best Thing to Do in Da Nang in September
Visiting the Marble Mountains is one of the best activities to do in Da Nang during September. These five limestone and marble hills, each named after an element — metal, wood, water, fire, and earth — offer a perfect blend of natural beauty and cultural significance.
The cooler weather in September is excellent for climbing the steps carved into the mountains to explore caves filled with Buddhist sanctuaries and enjoying the panoramic views of the surrounding area.
Why You Should or Shouldn’t Visit Da Nang in September
Why You Should Visit: September is a great month to visit Da Nang because of the improving weather conditions — warm days with reduced humidity and less rainfall. The tourist crowd thins out, allowing for a more relaxed experience whether you are on the beach or touring cultural sites.
Why You Might Not Want to Visit: While the weather is generally better, September can still see occasional rain showers, which might disrupt plans, especially if you’re keen on spending a lot of time outdoors or on the beach.
Nha Trang in September

If you’re into diving or snorkeling, Nha Trang’s waters are calm and clear in September. The marine life this time of year is impressive.
Weather in Nha Trang in September
September in Nha Trang typically has some of the best weather conditions for visiting. The temperatures hover around 24°C to 32°C (75°F to 90°F), providing warmth without the oppressive heat found earlier in the summer.
Unlike many other parts of Vietnam, Nha Trang sees relatively little rainfall in September, thanks to its unique microclimate. This makes it one of the drier spots in the country during this time. Humidity is moderate, making outdoor activities and beach time quite pleasant.
The Best Thing to Do in Nha Trang in September
Diving and snorkeling are the best activities to do while in Nha Trang during September. The clear, calm waters this month provide excellent visibility for exploring the underwater life.
If you’re not into diving, a boat trip to the nearby islands, like Bamboo Island, offers a great alternative with opportunities for snorkeling, swimming, and relaxing on beautiful beaches.
Why You Should or Shouldn’t Visit Nha Trang in September
Why You Should Visit: September is ideal for visiting Nha Trang due to the excellent weather — warm, sunny days with minimal rain are perfect for beach activities and exploring the city. The sea conditions are optimal for water sports, especially snorkeling and diving, which are big draws in this coastal city.
Why You Might Not Want to Visit: If you’re looking for lush, green landscapes or a more culturally immersive Vietnamese experience, Nha Trang in September might not meet those expectations. The city is very much geared towards beach tourism and water sports, which might not appeal as much if you’re more interested in historical or cultural exploration.
Dalat in September

For a cooler escape, head to Dalat in the central highlands. It’s known for its mild weather, beautiful lakes, and flower gardens. It’s a great spot for hiking and enjoying the outdoors without the heat and humidity of the coast.
Weather in Dalat in September
Dalat in September is a breath of fresh air compared to the humid coastal and southern regions of Vietnam. Year round, Dalat has a cool and temperate climate with temperatures ranging between 18°C to 23°C (64°F to 73°F).
This is the tail end of the rainy season for Dalat, so you might still encounter some rainfall, especially in the early part of the month. However, these rains usually come in quick bursts and tend to clear up fast, leaving fresh and crisp air.
The humidity is much lower than in other parts of Vietnam, which makes it pleasant for exploring outdoors.
The Best Thing to Do in Dalat in September
Exploring the gardens and waterfalls that Dalat is famous for is an excellent September activity. The post-rain landscape is lush, making places like the Valley of Love, Dalat Flower Gardens, and the surrounding coffee plantations exceptionally beautiful.
Hiking is also a good bet this month. Elephant Falls and Pongour Falls will give you a scenic escape into nature. Or hiking to the top of Lang Biang Mountain is a challenging day out.
Why You Should or Shouldn’t Visit Dalat in September
Why You Should Visit: September is a great time to visit Dalat if you enjoy mild weather and natural beauty. The climate is ideal for outdoor activities without the intense heat or humidity found elsewhere in Vietnam at this time.
Why You Might Not Want to Visit: While Dalat’s weather in September is generally mild, the lingering rain showers might deter those looking for guaranteed dry days. Additionally, if you’re seeking a beach holiday or a typical tropical environment, Dalat’s cooler, mountainous climate might not align with your expectations. It’s more suited to those looking to escape the heat rather than soak it up.
Sa Pa in September

Late September is a brilliant time to visit Sa Pa for some trekking as the rice terraces are at their most photogenic… lush green before the harvest. The cooler climate in the mountains makes trekking more enjoyable.
Weather in Sapa in September
September in Sapa brings a noticeable shift towards more pleasant weather conditions as the region begins to transition from the rainy season to the drier months of autumn.
The temperatures are mild, typically ranging from 15°C to 25°C (59°F to 77°F), which is excellent for outdoor activities. While you might still get some rain early in the month, the frequency and intensity decreases significantly as the month progresses. The humidity also starts to lessen, making the air feel fresher and more comfortable.
The Best Thing to Do in Sapa in September
Trekking is by far the best activity to do during September in Sapa. The landscapes are at their most vibrant, especially early in the month.
This is the tail end of the rice-growing season, and the golden hues of ripening rice paddies are very cool to see.
Trekking routes through villages are beautiful, and offer a chance to interact with local ethnic communities. For those looking for a less strenuous activity, taking a cable car up to Fansipan Peak gives you a panoramic view of the region from the highest point in Indochina.
Why You Should or Shouldn’t Visit Sapa in September
Why You Should Visit: September is one of the best months to visit Sapa if you want to experience the area’s natural beauty in milder weather. The reduced rainfall and cooler temperatures make hiking and exploring much more enjoyable. The scenery is also spectacular, with the rice terraces in full color, providing perfect photo opportunities.
Why You Might Not Want to Visit: The early part of September can still be a bit wet, and if you’re unlucky, you might catch some lingering showers that could impact your trekking plans. Also, the nights in Sapa can start to get chilly, so if you’re not prepared for cooler weather, it might come as a surprise. Plus, the mists, while beautiful, can sometimes obscure views, particularly in the mornings and late afternoons.
Phu Quoc in September

Wrap up your September trip with some relaxation on Phu Quoc Island. The rainy season starts to taper off, and you can enjoy the beautiful beaches and sunsets with fewer tourists around.
Weather in Phu Quoc in September
September in Phu Quoc means the tail end of the rainy season, which means the weather can be a bit of a mixed bag. You’ll experience warm temperatures ranging from 24°C to 30°C (75°F to 86°F).
While there are still several rainy days, the frequency and intensity of rainfall begin to decrease as the month progresses. The humidity remains high, which is typical for tropical climates, but the rain brings a refreshing break from the heat.
The Best Thing to Do in Phu Quoc in September
Exploring the beaches and snorkeling are fantastic activities in Phu Quoc during September. Despite the occasional rain, the waters are usually calm and clear, making it good for underwater adventures.
Another must-do is a visit to the Phu Quoc National Park, which covers more than half of the island and is perfect for hiking and wildlife spotting.
Why You Should or Shouldn’t Visit Phu Quoc in September
Why You Should Visit: September can be a great time to visit Phu Quoc if you’re looking for a quieter vacation with fewer tourists and lower prices. The weather, while still seeing some rain, begins to clear up, and you can enjoy beautiful sunny spells in between. The sea conditions are generally good for swimming and snorkeling.
Why You Might Not Want to Visit: The main drawback of visiting in September is the unpredictability of the weather. You might encounter some rainy days, which could limit your time on the beach and potentially affect outdoor activities. The high humidity might also be uncomfortable for those not used to tropical climates. If you prefer guaranteed sunshine all day long, the lingering showers of the rainy season might not be ideal.
Frequently Asked Questions about Vietnam in September (FAQs)

Here are some frequently asked questions (FAQs) about visiting Vietnam in September, which can help you plan your trip more effectively:
Is September a good time to visit Vietnam?
YES – September is a good time to visit as it marks the transition from the rainy season to the drier months, particularly in the northern and central regions. The weather begins to cool down, and the rain decreases, making it more comfortable for travel and sightseeing.
What should I pack for a trip to Vietnam in September?
You should pack light, breathable clothing due to the lingering humidity, but also bring along a waterproof jacket or an umbrella for occasional showers. For trekking or visits to cooler areas like Sapa or Dalat, bring some warmer layers for the evenings.
Are there any festivals in Vietnam in September?
YES – the Mid-Autumn Festival, also known as the Moon Festival, typically occurs in September. It’s a cultural event celebrated with mooncakes, lanterns, and various festivities, particularly enjoyable in places like Hanoi and Hoi An.
Are there a lot of tourists in Vietnam in September?
September generally sees fewer tourists compared to peak travel seasons like summer and winter holidays. This can mean fewer crowds at popular attractions and potentially lower prices for accommodations and tours.
What are the best places to visit in Vietnam in September?
Popular destinations in September include Hanoi, Halong Bay, Hue, Hoi An, and Sapa. These locations offer decent weather conditions and seasonal activities that take advantage of the transitioning weather.
How are the beach conditions in Vietnam in September?
Beach conditions vary by region. In central Vietnam, including places like Da Nang and Nha Trang, the weather starts to improve with less rain and calmer seas, making it a good time for beach activities. However, southern beaches like those in Phu Quoc might still experience some rainfall.
Is it safe to travel to Vietnam in September considering the weather?
While September is generally safe for travel, it’s still part of the typhoon season for northern and central Vietnam. It’s wise to check weather forecasts and travel advisories regularly and plan your itinerary with some flexibility.
Final Thoughts on Visiting Vietnam in September
Visiting Vietnam in September is an excellent idea for those who appreciate a blend of mild(er) weather and cultural richness.
The rains and heat from the summer months are coming down. Cities are full of spirit and culture to celebrate the moon festival. And the bigger tourist numbers from the summer are lessening. All in all it is a good month for traveling to Vietnam!
You’ll need to pack some layers for the cooler evenings in the north mountains. And keep an umbrella handy for the rain showers that will still come.
And remember, if the slight unpredictability of September’s weather doesn’t suit your travel style, Vietnam’s varied seasonal experiences mean there’s a perfect time for everyone. You can check out more on what other months in Vietnam are like below:
- Vietnam in January
- Vietnam in February
- Vietnam in March
- Vietnam in April
- Vietnam in May
- Vietnam in June
- Vietnam in July
- Vietnam in August
- Vietnam in October
- Vietnam in November
- Vietnam in December








