Hanoi in September: Weather & climate information
- Hanoi weather in autumn features typical characteristics including cooler temperatures, fewer rains and most often during the second half of the month.
- The climate is humid and some extreme weather such as tropical storms may occur.
- This is a "back to school" month, therefore traffic is often busy.
The ending of the long rainy season in Hanoi is also the beginning of its beautiful autumn – the season of flower blossom and love. The beauty of Hanoi’s autumn is a popular topic of uncountable songs and poems can describe how wonderful it is.
September Averages
| Min Temperature | 24.3°C | Precipitation | 109.5mm |
| Max Temperature | 31.7°C | Rainy Days | 5.0 days |
| Humidity | 79.4% | Sunshine Hours | 10.8 hours |
Historical weather
September weather averages for Hanoi in the last 10 years ( 2010 to 2020).
- 2010
- 2011
- 2012
- 2013
- 2014
- 2015
- 2016
- 2017
- 2018
- 2019
- 2020
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|
1 25.0°30.0° | ||||||
2 25.0°31.0° | 3 24.0°33.0° | 4 25.0°27.0° | 5 22.0°26.0° | 6 22.0°26.0° | 7 21.0°29.0° | 8 23.0°29.0° |
9 23.0°31.0° | 10 22.0°33.0° | 11 23.0°30.0° | 12 24.0°29.0° | 13 24.0°30.0° | 14 22.0°34.0° | 15 24.0°34.0° |
16 24.0°34.0° | 17 24.0°34.0° | 18 25.0°34.0° | 19 23.0°32.0° | 20 22.0°29.0° | 21 22.0°33.0° | 22 24.0°34.0° |
23 24.0°31.0° | 24 23.0°28.0° | 25 22.0°24.0° | 26 20.0°23.0° | 27 19.0°29.0° | 28 22.0°31.0° | 29 21.0°30.0° |
30 20.0°24.0° |
Temperature Graph (°C)
The average Hanoi temperature during September is around 27.8°C (82.04°F).
| Month | High | Low | Changes |
| August | 32.8°C (91.04°F) | 25.5°C (77.9°F) | -1.1°C (30.02°F) |
| September* | 31.7°C (89.06°F) | 24.3°C (75.74°F) | -1.1°C (30.02°F) |
| October | 29.3°C (84.74°F) | 21.9°C (71.42°F) | -2.5°C (27.5°F) |
Humidity Graph (%)
The average humidity in September in Hanoi is 79.4%, which is 0.1% lower than August and 6.0% higher than October.
Rainfall Graph (mm)
Average rainfall in September in Hanoi: 109.5mm
| August | September* | October |
| 184.6mm (-75.1mm) | 109.5mm | 77.8mm (+31.7mm) |
Rain Days Graph
Average rain days in September in Hanoi: 5.0 days
Daylight Graph
Average daylight in September in Hanoi: 12.3h
Tips for visiting Hanoi in September
September is the transforming time between summer and autumn, so the weather is cooler and more comfortable. Although the temperature is still in a high level, the hot in this time is not extreme than in June and July with less sunlight.
Although its temperature range hasn’t changed much, in between 26 to 31°C, sunlight is not too strong and highest temperature remains below 35°C. The decrease of the humidity in combination with its cool breeze, soft sunlight and clear blue sky make Hanoi such a romantic place. Besides T-shirts and shorts, a good camera is recommended to capture charming tree-lined boulevards of milk wood pines or streets piled high with yellow leaves.
In September, Hanoi proudly celebrates Vietnam’s Independence Day on September 2nd with many hilarious events organized around the city. Besides, shopping centers may offer discount and entertaining centers are always crowed with special events on the day.
Another exciting day ones may enjoy is Mid-Autumn Festival, usually occurs in the second half of September and some time at the beginning of October. During the festivals, Hanoi’s streets are colored in red with lanterns and children toys. Additionally, moon cakes are must-try if ones arrived at the time of the festival.
September is the last month of damp season in Hanoi, but it may still cause quite many rainy days, except for that acceptable detriment, Hanoi’s autumn is really worth a visit.
What to pack
If you plan to come to Hanoi in September, you can still bring T-shirts and shorts for some hotter days while light sweaters are necessary for chilly nights. Sunscreen is not really essential but it can protect you from the UV while being out for a long time. Because of the low humidity, you need to drink more water.
Frequently asked questions
How is the weather in Hanoi in September?
September is a hot month in Hanoi with an average temperature of 27.8°C. Hanoi's temperature in September ranges between 24.3°C (75.74°F) and 31.7°C (89.06°F).
Is Hanoi humid in September?
Yes, it is. The humidity of Hanoi in September is around 79.4% and rarely falls below 52.0%.
Does it rain often in Hanoi in September?
No, it does not. Hanoi has only 5.0 rainy days in September with an approximate 109.5mm (4.31") of precipitation.
How many hours of daylight are there in September in Hanoi?
In September, Hanoi's average day-length is 12.3 hours.
How long is the sun out per day in Hanoi in September?
The average sunshine hours of Hanoi in September is 10.8 hours.
