Complete Guide to Vietnam Weather in September: Temperature & Things to Do

Vietnam Weather September Overview

September marks the beginning of autumn and is one of the most beautiful months to travel to Vietnam thanks to its comfortable climate. As it is the changing time between the hot and cold seasons, there will be a fluctuating temperature difference between the early and the end of this month. Vietnam’s average temperature in September is about 24°C - 33°C. Along with the decrease in rainfall in both the North and South regions, September weather is said to be very beautiful and suitable for travelling almost anywhere in the country.

Here's an overview of September weather in three regions:

Weather Snapshot of Vietnam's 7 Top Destinations in September

Hanoi temperature September

September marks a transition in Hanoi as the city begins to cool down after the summer heat. The air becomes fresher, the sky clearer, and there's a noticeable drop in humidity levels. While short-lived showers still occur, they are less intense, making the month favorable for sightseeing, street food tours, and cultural exploration. The capital starts to take on a touch of autumn charm, with golden leaves appearing on tree-lined boulevards and a romantic atmosphere settling in.

• Average Temperature: 24°C - 30°C (75°F - 86°F)
• Rainfall: Up to 265 mm, mainly in early September
• Recommended Activities: Wander around the Old Quarter, visit historical sites like the Temple of Literature, savor seasonal treats like green rice (Com).

Hanoi’s cool September weather makes it perfect for exploring historical sites

Da Nang September Weather

Da Nang experiences the tail-end of the summer monsoon in September. The weather is warm, but the frequency of rain increases, often in the form of late afternoon showers or overnight rain. Despite this, you can still enjoy long stretches of sunshine in between. Sea conditions remain suitable for swimming early in the month, while the surrounding landscapes are lush from the rainfall, ideal for short nature escapes.

• Average Temperature: 25°C - 32°C (77°F - 89°F)
• Rainfall: Around 312 mm, with frequent rainy days (15 - 20 days)
• Recommended Activities: Take a trip to Ba Na Hills and its Golden Bridge, enjoy fresh seafood at beachside restaurants, or visit the Dragon Bridge at night.

Although it rains from time to time, Da Nang still enjoys periods of sunshine in between

Ho Chi Minh Weather in September

In Ho Chi Minh City, September continues the rainy season pattern with frequent tropical downpours. However, these rains are usually brief and followed by clear skies. Temperatures remain warm, and the city's lively atmosphere continues undisturbed. It's a great month for immersing in vibrant street life, shopping, and visiting air-conditioned museums and attractions. Streets are also less dusty, thanks to regular rainfall.

• Average Temperature: 24°C - 32°C (75°F - 90°F)
• Rainfall: Approximately 327 mm, mostly afternoon rains
• Recommended Activities: Explore Cu Chi Tunnels or the War Remnants Museum, take a dinner cruise on the Saigon River, or unwind in rooftop bars.

Ho Chi Minh City enjoys clear skies and pleasant weather in September

Hoi An Weather in September

Hoi An witnesses the return of regular rain in September, typically short bursts in the late afternoon. Despite the moisture, this UNESCO World Heritage town remains charming, and its cultural activities continue to delight. Fewer tourists mean more peaceful streets, and the countryside around Hoi An turns a vibrant green. The monthly Full Moon Festival - if it falls during your visit - adds extra magic to your trip.

• Average Temperature: 25°C - 31°C (77°F - 88°F)
• Rainfall: Around 250 mm, with moderate to high humidity
• Recommended Activities: Attend the lantern festival, take a countryside bike tour, try a Vietnamese cooking class.

Hoi An stays charming in September with brief rains and vibrant activities

Sapa Vietnam Weather September

September is widely regarded as one of the most beautiful times to visit Sapa. The rice terraces are at their golden peak before harvest, creating picture-perfect views. The weather is cool and refreshing, especially in the morning and evening, with gentle mists adding to the mountain charm. Rain is still present but significantly reduced compared to summer, making trekking and exploring local villages very enjoyable.

• Average Temperature: 16°C - 23°C (61°F - 73°F)
• Rainfall: Around 192 mm, often light or scattered
• Recommended Activities: Trekking to ethnic minority villages like Lao Chai and Ta Van, visiting rice terraces in Mu Cang Chai (nearby), or enjoying a homestay experience.

September offers stunning views in Sapa with golden rice terraces at their peak

Phu Quoc Weather September

September remains the rainy season for Phu Quoc, though rainfall tends to lessen slightly toward the end of the month. The island's lush vegetation is at its peak, and waterfalls are flowing with full force. This is a low tourist season, so you can enjoy secluded beaches, discounted accommodations, and peaceful surroundings. While beach days may be interrupted by rain, indoor and cultural activities can still be enjoyed.

• Average Temperature: 25°C - 30°C (77°F - 86°F)
• Rainfall: Around 258 mm, with 15 - 18 rainy days
• Recommended Activities: Explore Suoi Tranh Waterfall, visit local pepper farms and the night market, enjoy spa retreats or cooking classes.

Suoi Tranh Waterfall in Phu Quoc is at its most majestic of the year

Da Lat Weather September

Da Lat in September is cool, misty, and romantic - true to its nickname “City of Eternal Spring.” Though it experiences regular afternoon drizzles, mornings and evenings are ideal for sightseeing. The rain brings out the lush greenery and blooming flowers across the town’s hills, lakes, and pine forests. It's an excellent time for couples or those seeking a peaceful escape from tropical heat.

• Average Temperature: 17°C - 24°C (63°F - 75°F)
• Rainfall: Around 280 mm, typically light showers
• Recommended Activities: Stroll around Xuan Huong Lake, visit flower gardens and waterfalls, enjoy warm drinks in hilltop cafés.

Da Lat in September is perfect for sightseeing with its lakes and pine forests

Vietnam Weather in September: Best Places to Visit

Golden Rice Fields in North Vietnam

As mentioned, September is the harvest season in North Vietnam and there is no doubt that you shouldn’t miss the chance to see the amazingly magnificent scenery of golden rice fields. To have the best view of paddies, you had better plan a trip to Sapa, Ninh Binh, or Mu Cang Chai at this time.

You may be interested in 4 Best Places to See Golden Rice Fields in Vietnam

Hanoi Capital

September 2nd is Vietnam National Independence Day and is celebrated across the country. On this occasion, you can see National flags, pictures, etc. of Ho Chi Minh President adorn the streets in big and small cities here. However, as the heart of the country and also the most important political centre, Hanoi Capital owns the biggest celebrations with a large parade in Ba Dinh Square in front of Ho Chi Minh’s mausoleum, many great performances taking place in a few days, and also the gorgeous fireworks at the 2nd Sept night. Something to note is that some shops and restaurants may be closed this time or provide services at higher prices.

Lan Ha Bay 

Some tourists avoid travelling to Lan Ha Bay this time, but there is a reason to go. September is autumn in Lan Ha bay with a little bit of rain which does not last long. You can enjoy a cool breeze and more comfortable weather than in the summer. Moreover, this is the off-peak season for local tourists as the school reopens and you can easily find a lot of promotions when booking the Lan Ha Bay cruise. Fewer tourists mean you get better service and the bay is more peaceful, and you have a chance to fully enjoy the breathtaking Halong Bay with a crystal clear blue sky and seawater, or join swimming and other activities in the water such as try snorkelling, kayaking, and visiting floating villages.

September is a great time to visit Lan Ha Bay with cooler weather and fewer crowds

Mui Ne (Phan Thiet)

Some rain in the Central can not prevent you from getting closer to the beach as it does not matter if you’ll get wet on the beach one way or another. September is the first month of autumn in Mui Ne (Phan Thiet) and as mentioned above, this place in Central Vietnam is where would have the least rain in September. The weather here is cooler than the previous month as the temperature is in the range of an average high of 30°C and an average low of 24°C and the seawater temperature is around 28°C. All show that September is a great time for beach relaxing in Mui Ne and enjoy other activities here such as swimming in the windsurfing, or kitesurfing (thanks to strong sea breezes).

September marks the start of Autumn in Mui Ne, ideal for swimming, wind- and kitesurfing

Mekong Delta

Although September is the rainy season in Mekong Delta (South Vietnam), it is also the time that you can see the unique beauty of this area that is hard to find anywhere else. As it usually rains in this month, the water level in rivers and fields rises thrivingly, creating the annual floating water season which will last from September till November.

More water brings a better life for plants and creatures in the Mekong Delta; therefore, September - November is the best time to see the natural beauty of this area. You should spend time visiting national parks and natural reserves here to admire the precious birds (some kinds even in the Red Book) and the wild beauty of Mangrove forests. 

In addition, the Mekong Delta is home to many fruit orchards which provide fresh tropical fruits all year round. You should also visit an orchard to taste the delightful fruits here at a very cheap price. Cai Be Orchard (Tien Giang Province), Cai Mon Orchard (Ben Tre Province), Vinh Long Orchard are among the best orchards in the Mekong Delta where you can find a variety of fruits through four seasons of the year, and some outstanding types are Nam Roi Pomelo and Binh Hoa Phuoc rambutan, and a wide selection of other fruits, like durian, longan, tangerine, mango, etc.

The Mekong Delta enters its floating season with a unique beauty found nowhere else

Is September a Good Time to Visit Vietnam?

Yes, September is generally a great time to travel across Vietnam. The weather tends to be mild and comfortable, with a noticeable drop in humidity and temperature compared to peak summer. While brief showers may still occur - especially in central and southern regions - they are usually not intense enough to disrupt travel plans. Northern areas like Hanoi and Sapa start enjoying early autumn with cool breezes, while the southern regions remain warm and lively.

Major Events and Festivals in September

September hosts several cultural events and festivals that enrich your travel experience:

Vietnam National Day (September 2)

Held across the country, especially vibrant in Hanoi and Ho Chi Minh City. Expect patriotic parades, flag-raising ceremonies, and colorful fireworks that showcase Vietnam’s national pride.

Mid-Autumn Festival (Tet Trung Thu)

Celebrated nationwide, particularly joyful in Hanoi and Hoi An. Streets come alive with lantern displays, lion dances, and mooncake stalls. This is a magical time for families and photographers alike.

“Golden Tourism Month” in Hue

A month-long promotion in Hue featuring discounted tickets to imperial landmarks, art exhibitions, and cultural shows. It’s a great time to explore this historic city at a relaxed pace.

Nghinh Ong Festival in Can Gio, Ho Chi Minh City

Typically held in mid-to-late September, this festival honors the Whale God, a guardian of fishermen. Includes boat processions, seafood feasts, and traditional rituals by the sea.

Le Van Duyet Mausoleum Festival (HCMC)

A spiritual and historical gathering that commemorates General Le Van Duyet. Visitors can witness ceremonial offerings, folk performances, and community prayers.

Con Son - Kiep Bac Festival (Hai Duong)

Celebrated in northern Vietnam to honor national heroes like General Tran Hung Dao. The festival includes incense ceremonies, water puppet shows, and reenactments of historical battles.

Top Tips for Exploring Vietnam in September

• Bring along an umbrella, poncho raincoat, waterproof jacket, and shoes/flip-flops.
• Prepare multivitamins, Vitamin C, and flu medicines to stay healthy in a changing season time like September
• Have contingency plans to enjoy your trip even if it rains suddenly and you can’t enjoy outdoor activities.
• Avoid visiting destinations where they have a high chance of rain.

September is a fantastic time to visit Vietnam for travelers seeking a mix of culture, nature, and comfort. With mild temperatures, festive events, and beautiful scenery, it offers memorable experiences without the peak-season crowds. Let’s plan your trip with our expert guides to make the most of your Vietnam adventure this autumn.

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MinKJ

Image source: Internet