Climate averages 1991–2020
Hanoi weather
in May.
A hot, very wet month: the 4th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Hanoi: daytime highs average 31.1°C and nights cool to about 24.2°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 232 mm of rain on roughly 18 days, which makes May a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 08 min on an average May day.
The nearest other city in this atlas is Tây Hồ (6 km away). In May its highs average 31.0°C, about as warm as Hanoi, with 232 mm of rain.
Among the 136 cities listed in Vietnam, Hanoi ranks joint 73rd of 136 for the warmest May highs and joint 99th of 136 for the driest May (rainfall, lowest first). The mean May high of those 136 cities is 31.2°C; Hanoi is 0.1°C cooler than that mean.
From May to June, average highs rise by 1.5°C to 32.6°C, and monthly rainfall falls from 232 mm to 226 mm.
The annual picture
May 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, selected | 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 | 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
May in nearby cities
- Tây Hồ in MayVietnam · 6 kmHigh 31.0°C · Low 24.2°C · 232 mm rain
- Long Bien in MayVietnam · 6 kmHigh 31.1°C · Low 24.3°C · 232 mm rain
- Bắc Từ Liêm in MayVietnam · 11 kmHigh 31.0°C · Low 24.2°C · 232 mm rain
- Thuận Thanh in MayVietnam · 25 kmHigh 31.0°C · Low 24.4°C · 232 mm rain
- Sóc Sơn in MayVietnam · 26 kmHigh 30.9°C · Low 24.2°C · 241 mm rain
- Phúc Yên in MayVietnam · 28 kmHigh 31.0°C · Low 24.2°C · 241 mm rain
- Mỹ Hào in MayVietnam · 28 kmHigh 31.1°C · Low 24.5°C · 232 mm rain
- Bắc Ninh in MayVietnam · 30 kmHigh 31.0°C · Low 24.2°C · 251 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.