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Hanoi, Vietnam climate
Cwa Monsoon-influenced humid subtropical
Hanoi has a mildly seasonal tropical climate (Monsoon-influenced humid subtropical, Köppen Cwa). The hottest month is June with an average daily high near 93°F, while the coldest is January averaging around 57°F at night. Precipitation totals about 56 inches a year and is strongly seasonal — August alone averages 10.6 inches while December barely receives 0.85 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Hanoi climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 68 | 71 | 75 | 83 | 90 | 93 | 92 | 91 | 90 | 86 | 80 | 72 |
| Avg temp (°F) | 63 | 66 | 70 | 77 | 83 | 86 | 86 | 85 | 83 | 79 | 73 | 65 |
| Avg low (°F) | 57 | 60 | 65 | 71 | 76 | 79 | 79 | 78 | 77 | 72 | 66 | 59 |
| Precipitation (in) | 1.2 | 0.9 | 2.0 | 3.7 | 7.1 | 8.0 | 10.3 | 10.6 | 5.9 | 3.5 | 2.0 | 0.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 68 | 71 | 75 | 83 | 90 | 93 |
| Avg temp (°F) | 63 | 66 | 70 | 77 | 83 | 86 |
| Avg low (°F) | 57 | 60 | 65 | 71 | 76 | 79 |
| Precipitation (in) | 1.2 | 0.9 | 2.0 | 3.7 | 7.1 | 8.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 92 | 91 | 90 | 86 | 80 | 72 |
| Avg temp (°F) | 86 | 85 | 83 | 79 | 73 | 65 |
| Avg low (°F) | 79 | 78 | 77 | 72 | 66 | 59 |
| Precipitation (in) | 10.3 | 10.6 | 5.9 | 3.5 | 2.0 | 0.9 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 73 | 76 | 79 | 80 | 79 | 85 | 85 | 81 | 70 | 62 | 60 | 64 |
| Relative humidity (%) | 80 | 79 | 79 | 77 | 80 | 83 | 84 | 85 | 85 | 83 | 81 | 79 |
| Wind speed (mph) | 4.2 | 4.7 | 5.1 | 4.9 | 4.2 | 3.5 | 3.4 | 3.1 | 3.4 | 3.7 | 3.6 | 3.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 73 | 76 | 79 | 80 | 79 | 85 |
| Relative humidity (%) | 80 | 79 | 79 | 77 | 80 | 83 |
| Wind speed (mph) | 4.2 | 4.7 | 5.1 | 4.9 | 4.2 | 3.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 85 | 81 | 70 | 62 | 60 | 64 |
| Relative humidity (%) | 84 | 85 | 85 | 83 | 81 | 79 |
| Wind speed (mph) | 3.4 | 3.1 | 3.4 | 3.7 | 3.6 | 3.8 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Noibai Intl, a weather station, about 22 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.