Climate averages 1991–2020
Hanoi weather
in August.
A hot, very wet month: the 3rd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Hanoi: daytime highs average 31.4°C and nights cool to about 25.4°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 314 mm of rain on roughly 23 days, which makes August a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 51 min on an average August day.
The nearest other city in this atlas is Tây Hồ (6 km away). In August its highs average 31.4°C, about as warm as Hanoi, with 314 mm of rain.
Among the 136 cities listed in Vietnam, Hanoi ranks joint 31st of 136 for the warmest August highs and joint 94th of 136 for the driest August (rainfall, lowest first). The mean August high of those 136 cities is 30.5°C; Hanoi is 1.0°C warmer than that mean.
From August to September, average highs fall by 1.2°C to 30.3°C, and monthly rainfall falls from 314 mm to 226 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Hanoi climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.6°C13.6°C | 13.6°C | 40 | 7.7 | 11.011 h |
| February | 21.7°C15.2°C | 15.2°C | 27 | 6.8 | 11.411 h |
| March | 24.9°C18.1°C | 18.1°C | 52 | 9.6 | 12.012 h |
| April | 28.8°C21.6°C | 21.6°C | 100 | 11.1 | 12.613 h |
| May | 31.1°C24.2°C | 24.2°C | 232 | 17.5 | 13.113 h |
| June | 32.6°C26.0°C | 26.0°C | 226 | 18.3 | 13.413 h |
| July | 32.3°C26.0°C | 26.0°C | 259 | 20.4 | 13.313 h |
| August, selected | 31.4°C25.4°C | 25.4°C | 314 | 22.5 | 12.813 h |
| September | 30.3°C24.1°C | 24.1°C | 226 | 18.7 | 12.312 h |
| October | 28.2°C21.5°C | 21.5°C | 121 | 11.9 | 11.712 h |
| November | 25.0°C17.9°C | 17.9°C | 57 | 7.2 | 11.211 h |
| December | 21.0°C14.1°C | 14.1°C | 33 | 6.6 | 10.911 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Tây Hồ in AugustVietnam · 6 kmHigh 31.4°C · Low 25.4°C · 314 mm rain
- Long Bien in AugustVietnam · 6 kmHigh 31.4°C · Low 25.4°C · 350 mm rain
- Bắc Từ Liêm in AugustVietnam · 11 kmHigh 31.3°C · Low 25.3°C · 314 mm rain
- Thuận Thanh in AugustVietnam · 25 kmHigh 31.4°C · Low 25.4°C · 350 mm rain
- Sóc Sơn in AugustVietnam · 26 kmHigh 31.5°C · Low 25.4°C · 351 mm rain
- Phúc Yên in AugustVietnam · 28 kmHigh 31.4°C · Low 25.4°C · 351 mm rain
- Mỹ Hào in AugustVietnam · 28 kmHigh 31.4°C · Low 25.6°C · 350 mm rain
- Bắc Ninh in AugustVietnam · 30 kmHigh 31.5°C · Low 25.3°C · 361 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Hanoi) is explained once on the Hanoi year overview and on the Sources, method and limits page.
Bắc Từ Liêm and Tây Hồ lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.