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Kumamoto, Japan climate
Cfa Humid subtropical
Kumamoto has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 33°C, while the coldest is January averaging around 2°C at night. Precipitation totals about 2007 mm a year and is strongly seasonal — June alone averages 448 mm while January barely receives 57 mm.
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)Kumamoto climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 16 | 21 | 26 | 28 | 32 | 33 | 30 | 25 | 19 | 13 |
| Avg temp (°C) | 6 | 7 | 11 | 16 | 21 | 24 | 28 | 28 | 25 | 20 | 14 | 8 |
| Avg low (°C) | 2 | 3 | 6 | 11 | 16 | 20 | 24 | 25 | 21 | 15 | 9 | 3 |
| Precipitation (mm) | 57 | 83 | 125 | 145 | 161 | 448 | 387 | 195 | 173 | 87 | 84 | 61 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 16 | 21 | 26 | 28 |
| Avg temp (°C) | 6 | 7 | 11 | 16 | 21 | 24 |
| Avg low (°C) | 2 | 3 | 6 | 11 | 16 | 20 |
| Precipitation (mm) | 57 | 83 | 125 | 145 | 161 | 448 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 33 | 30 | 25 | 19 | 13 |
| Avg temp (°C) | 28 | 28 | 25 | 20 | 14 | 8 |
| Avg low (°C) | 24 | 25 | 21 | 15 | 9 | 3 |
| Precipitation (mm) | 387 | 195 | 173 | 87 | 84 | 61 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 67 | 66 | 64 | 68 | 81 | 70 | 62 | 63 | 55 | 60 | 66 |
| Relative humidity (%) | 81 | 79 | 78 | 78 | 79 | 84 | 86 | 84 | 84 | 82 | 81 | 81 |
| Wind speed (mph) | 3.4 | 3.5 | 3.3 | 2.9 | 2.4 | 2.2 | 2.3 | 2.2 | 2.6 | 2.8 | 2.9 | 3.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 67 | 66 | 64 | 68 | 81 |
| Relative humidity (%) | 81 | 79 | 78 | 78 | 79 | 84 |
| Wind speed (mph) | 3.4 | 3.5 | 3.3 | 2.9 | 2.4 | 2.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 70 | 62 | 63 | 55 | 60 | 66 |
| Relative humidity (%) | 86 | 84 | 84 | 82 | 81 | 81 |
| Wind speed (mph) | 2.3 | 2.2 | 2.6 | 2.8 | 2.9 | 3.2 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Kumamoto, about 2 km from the city centre.
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.