Climate Averages in Hanoi in September

Welcoming morning sunlight Huc Bridge in September -Hanoi
Welcoming morning sunlight Huc Bridge in September. Photo: Teseum

September marks the transition from summer to fall as temperatures begin to drop and rainfall decreases. The fall season officially starts in the middle of September and is characterized by warm sunlight, gentle winds, and comfortable temperatures.

You can expect temperatures of as low as 78°F (25.5°C) and as high as 88°F (31.1°C) during this time. On average, there are 5.4 hours of direct sunlight throughout September, representing 43% of the 12.3 hours of daylight. On the first day of September, hot temperatures begin at 11:30 am and end at 6 pm. By the end of the month, you can expect hot temperatures to last from 1 pm to 5:30 pm.

September is the last month of Hanoi’s wet season. Although humidity slightly decreases from 82% in August to 79%, the hot temperatures mix with the moisture to bring about heavy, unpredictable rains. Hanoi receives 265.4 mm of rain in September over 13.7 rainfall days.

September Weather
Temperature 78-88°F (25.5-31.1°C)
Precipitation 265.4 mm
Humidity 79%
Rainfall 13.7 days
Daylight 12.3 hr
Sunlight 5.4 hr

Things To Do in Hanoi in September

Tet Trung Thu Festival in September, Hanoi
Lion Dance, Mid- Autumn Festival, Old Quarter in September. Photo: Gavin White

On September 2, the Vietnamese celebrate Vietnam National Day, which commemorates Vietnam’s declaration of independence from France in 1945. In Hanoi, locals celebrate with a large parade in Ba Dinh Square, speeches, a fireworks display, and other cultural festivities.

At the end of September, the Vietnamese celebrate the end of the harvest season during the Tet Trung Thu Festival, also known as the Mid-Autumn Festival. Children can be seen running around with colorful masks and toys during this family-friendly festival. Some of the festivities include lion dancing, fruit carving, dragon boat races, lantern fairs and more.

The Hanoi Pride Festival, which has been held annually since 2012, takes place for one week between July and September. The festival features a colorful parade, educational events, film screenings, parties, a bicycle rally, and more.

Tips for Visiting Hanoi in September

Let's take a sip and enjoy the sunlight at Little Tranquil, Hang Manh in September - Hanoi
Let’s take a sip and enjoy the sunlight at Little Tranquil, Hang Manh in September. Photo: ePi.Longo

September is one of the best months to visit Hanoi to enjoy warm temperatures without the sweltering heat and humidity of the summer months. The cooler weather conditions and the changing of the leaves make Hanoi a very romantic destination during this time of year.

Due to the warm weather, it is comfortable enough to wear a t-shirt and shorts during the day. However, as rainfall is still considered unpredictable in September, a rain jacket and other rain gear are recommended to remain comfortable.

It is also recommended that you wear adequate sun protection—especially sunscreen—during September as the sun’s UV rays can be harsh during this time of year.

Hanoi can become overly crowded near the end of the month due to the Mid-Autumn Festival, as many families from across the country plan to visit Vietnam’s capital city to celebrate the holiday. However, this would be an excellent time to visit Hanoi to experience the colourful festival and lively culture.

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