Hanoi weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Poor
Best time to visit: November – March
What is the weather like in Hanoi in September?
In September, Hanoi is hot: daytime highs average 30 °C, and even at night it stays warm at around 24 °C. Expect around 5 hours of sunshine a day. It rains often – on about 19 days, adding up to 246 mm. On about 19 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is not an ideal month for a holiday in Hanoi.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 26 | 34 | 60 |
| Day | 32° | 30° | 28° |
| Night | 26° | 24° | 22° |
| Sun | 4 h | 5 h | 5 h |
| Rain days | 22 | 19 | 12 |
More details for September
- Daylight
- 12 h 17 min05:43 – 18:01
- UV index
- 11 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or more
- Wind
- 11 km/haverage daily peak
- Cloud cover
- 72 %on average
- Hot days
- 19 days30 °C or more
- Time zone
- UTC+7Asia/Bangkok
How the score comes together
- Temperatureweight 50 %58 %
- Sunshineweight 20 %25 %
- Few rainy daysweight 30 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Hanoi in September: quick answers
Is Hanoi hot in September?
Yes. In September, Hanoi is hot: daytime highs average 30 °C and nights stay around 24 °C. On about 19 days the thermometer climbs to 30 °C or more.
Does it rain much in Hanoi in September?
It rains often – on about 19 days, adding up to 246 mm.
Hanoi month by month
The whole year in HanoiAll destinations: VietnamWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)