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Nagasaki, Japan climate
Cfa Humid subtropical
Nagasaki 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 1895 mm a year and is strongly seasonal — June alone averages 336 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)Nagasaki 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 | 16 | 20 | 23 | 27 | 28 | 25 | 20 | 15 | 9 |
| Avg low (°C) | 4 | 5 | 8 | 12 | 16 | 20 | 25 | 25 | 22 | 17 | 11 | 6 |
| Precipitation (mm) | 63 | 84 | 123 | 153 | 161 | 336 | 293 | 218 | 187 | 102 | 101 | 75 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 15 | 20 | 24 | 27 |
| Avg temp (°C) | 7 | 8 | 11 | 16 | 20 | 23 |
| Avg low (°C) | 4 | 5 | 8 | 12 | 16 | 20 |
| Precipitation (mm) | 63 | 84 | 123 | 153 | 161 | 336 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 32 | 29 | 24 | 19 | 13 |
| Avg temp (°C) | 27 | 28 | 25 | 20 | 15 | 9 |
| Avg low (°C) | 25 | 25 | 22 | 17 | 11 | 6 |
| Precipitation (mm) | 293 | 218 | 187 | 102 | 101 | 75 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 83 | 77 | 73 | 70 | 70 | 81 | 67 | 59 | 62 | 58 | 69 | 78 |
| Relative humidity (%) | 76 | 74 | 74 | 76 | 80 | 86 | 87 | 83 | 81 | 77 | 75 | 75 |
| Wind speed (mph) | 8.4 | 8.1 | 7.6 | 6.3 | 5.0 | 4.6 | 4.7 | 5.1 | 6.0 | 6.9 | 7.2 | 8.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 83 | 77 | 73 | 70 | 70 | 81 |
| Relative humidity (%) | 76 | 74 | 74 | 76 | 80 | 86 |
| Wind speed (mph) | 8.4 | 8.1 | 7.6 | 6.3 | 5.0 | 4.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 67 | 59 | 62 | 58 | 69 | 78 |
| Relative humidity (%) | 87 | 83 | 81 | 77 | 75 | 75 |
| Wind speed (mph) | 4.7 | 5.1 | 6.0 | 6.9 | 7.2 | 8.2 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Nagasaki, 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.