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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 89°F, while the coldest is January averaging around 39°F at night. Precipitation totals about 75 inches a year and is strongly seasonal — June alone averages 13.2 inches while January barely receives 2.48 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)Nagasaki climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 51 | 54 | 60 | 68 | 75 | 80 | 87 | 89 | 84 | 75 | 65 | 56 |
| Avg temp (°F) | 45 | 47 | 52 | 60 | 67 | 73 | 80 | 83 | 77 | 68 | 58 | 49 |
| Avg low (°F) | 39 | 40 | 46 | 53 | 61 | 68 | 76 | 78 | 71 | 62 | 52 | 43 |
| Precipitation (in) | 2.5 | 3.3 | 4.9 | 6.0 | 6.3 | 13.2 | 11.5 | 8.6 | 7.3 | 4.0 | 4.0 | 2.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 51 | 54 | 60 | 68 | 75 | 80 |
| Avg temp (°F) | 45 | 47 | 52 | 60 | 67 | 73 |
| Avg low (°F) | 39 | 40 | 46 | 53 | 61 | 68 |
| Precipitation (in) | 2.5 | 3.3 | 4.9 | 6.0 | 6.3 | 13.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 87 | 89 | 84 | 75 | 65 | 56 |
| Avg temp (°F) | 80 | 83 | 77 | 68 | 58 | 49 |
| Avg low (°F) | 76 | 78 | 71 | 62 | 52 | 43 |
| Precipitation (in) | 11.5 | 8.6 | 7.3 | 4.0 | 4.0 | 2.9 |
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.