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Nankoku, Japan climate
Cfa Humid subtropical
Nankoku has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 89°F, while the coldest is January averaging around 33°F at night. Precipitation totals about 93 inches a year and is strongly seasonal — September alone averages 13.2 inches while January barely receives 2.04 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)Nankoku climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 53 | 54 | 60 | 68 | 75 | 79 | 86 | 89 | 84 | 76 | 66 | 57 |
| Avg temp (°F) | 43 | 45 | 51 | 59 | 67 | 73 | 79 | 81 | 76 | 67 | 56 | 47 |
| Avg low (°F) | 33 | 36 | 42 | 51 | 59 | 66 | 73 | 74 | 69 | 58 | 47 | 37 |
| Precipitation (in) | 2.0 | 3.7 | 6.0 | 7.7 | 9.4 | 12.4 | 12.6 | 10.9 | 13.2 | 7.1 | 4.6 | 3.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 53 | 54 | 60 | 68 | 75 | 79 |
| Avg temp (°F) | 43 | 45 | 51 | 59 | 67 | 73 |
| Avg low (°F) | 33 | 36 | 42 | 51 | 59 | 66 |
| Precipitation (in) | 2.0 | 3.7 | 6.0 | 7.7 | 9.4 | 12.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 86 | 89 | 84 | 76 | 66 | 57 |
| Avg temp (°F) | 79 | 81 | 76 | 67 | 56 | 47 |
| Avg low (°F) | 73 | 74 | 69 | 58 | 47 | 37 |
| Precipitation (in) | 12.6 | 10.9 | 13.2 | 7.1 | 4.6 | 3.0 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 68 | 69 | 68 | 66 | 72 | 83 | 75 | 66 | 72 | 65 | 65 | 65 |
| Relative humidity (%) | 80 | 77 | 75 | 75 | 78 | 83 | 86 | 83 | 80 | 77 | 78 | 80 |
| Wind speed (mph) | 9.6 | 9.6 | 9.4 | 8.6 | 7.7 | 7.0 | 6.9 | 7.2 | 7.8 | 8.3 | 8.1 | 9.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 68 | 69 | 68 | 66 | 72 | 83 |
| Relative humidity (%) | 80 | 77 | 75 | 75 | 78 | 83 |
| Wind speed (mph) | 9.6 | 9.6 | 9.4 | 8.6 | 7.7 | 7.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 66 | 72 | 65 | 65 | 65 |
| Relative humidity (%) | 86 | 83 | 80 | 77 | 78 | 80 |
| Wind speed (mph) | 6.9 | 7.2 | 7.8 | 8.3 | 8.1 | 9.0 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Gomen, 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.