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Sasebo, Japan climate
Cfa Humid subtropical
Sasebo has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 32°C, while the coldest is January averaging around 4°C at night. Precipitation totals about 1989 mm a year and is strongly seasonal — July alone averages 342 mm while January barely receives 63 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)Sasebo climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 15 | 20 | 24 | 27 | 30 | 32 | 29 | 24 | 19 | 13 |
| Avg temp (°C) | 7 | 8 | 11 | 15 | 20 | 23 | 27 | 28 | 25 | 20 | 14 | 9 |
| Avg low (°C) | 4 | 4 | 7 | 11 | 16 | 20 | 24 | 25 | 22 | 16 | 11 | 6 |
| Precipitation (mm) | 63 | 81 | 121 | 153 | 171 | 329 | 342 | 255 | 196 | 99 | 102 | 77 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 15 | 20 | 24 | 27 |
| Avg temp (°C) | 7 | 8 | 11 | 15 | 20 | 23 |
| Avg low (°C) | 4 | 4 | 7 | 11 | 16 | 20 |
| Precipitation (mm) | 63 | 81 | 121 | 153 | 171 | 329 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 32 | 29 | 24 | 19 | 13 |
| Avg temp (°C) | 27 | 28 | 25 | 20 | 14 | 9 |
| Avg low (°C) | 24 | 25 | 22 | 16 | 11 | 6 |
| Precipitation (mm) | 342 | 255 | 196 | 99 | 102 | 77 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 75 | 74 | 72 | 72 | 82 | 72 | 65 | 68 | 64 | 69 | 74 |
| Relative humidity (%) | 79 | 77 | 77 | 78 | 80 | 85 | 86 | 84 | 84 | 81 | 80 | 79 |
| Wind speed (km/h) | 6.8 | 6.8 | 6.4 | 5.5 | 4.5 | 4.1 | 4.1 | 4.3 | 5.0 | 5.5 | 5.7 | 6.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 75 | 74 | 72 | 72 | 82 |
| Relative humidity (%) | 79 | 77 | 77 | 78 | 80 | 85 |
| Wind speed (km/h) | 6.8 | 6.8 | 6.4 | 5.5 | 4.5 | 4.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 65 | 68 | 64 | 69 | 74 |
| Relative humidity (%) | 86 | 84 | 84 | 81 | 80 | 79 |
| Wind speed (km/h) | 4.1 | 4.3 | 5.0 | 5.5 | 5.7 | 6.4 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Sasebo, about 1 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.