Home › Cities › Japan › Isahaya
Isahaya, Japan climate
Cfa Humid subtropical
Isahaya 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 3°C at night. Precipitation totals about 1811 mm a year and is strongly seasonal — June alone averages 306 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)Isahaya climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 16 | 20 | 25 | 27 | 31 | 33 | 29 | 25 | 19 | 13 |
| Avg temp (°C) | 7 | 8 | 11 | 15 | 20 | 23 | 27 | 28 | 25 | 20 | 14 | 9 |
| Avg low (°C) | 3 | 4 | 6 | 11 | 16 | 20 | 24 | 25 | 22 | 16 | 10 | 5 |
| Precipitation (mm) | 57 | 77 | 113 | 144 | 158 | 306 | 306 | 221 | 180 | 94 | 88 | 68 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 16 | 20 | 25 | 27 |
| Avg temp (°C) | 7 | 8 | 11 | 15 | 20 | 23 |
| Avg low (°C) | 3 | 4 | 6 | 11 | 16 | 20 |
| Precipitation (mm) | 57 | 77 | 113 | 144 | 158 | 306 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 33 | 29 | 25 | 19 | 13 |
| Avg temp (°C) | 27 | 28 | 25 | 20 | 14 | 9 |
| Avg low (°C) | 24 | 25 | 22 | 16 | 10 | 5 |
| Precipitation (mm) | 306 | 221 | 180 | 94 | 88 | 68 |
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 (%) | 79 | 77 | 77 | 78 | 80 | 85 | 86 | 84 | 84 | 81 | 80 | 79 |
| Wind speed (m/s) | 1.9 | 1.9 | 1.8 | 1.5 | 1.3 | 1.1 | 1.2 | 1.2 | 1.4 | 1.5 | 1.6 | 1.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 83 | 77 | 73 | 70 | 70 | 81 |
| Relative humidity (%) | 79 | 77 | 77 | 78 | 80 | 85 |
| Wind speed (m/s) | 1.9 | 1.9 | 1.8 | 1.5 | 1.3 | 1.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 67 | 59 | 62 | 58 | 69 | 78 |
| Relative humidity (%) | 86 | 84 | 84 | 81 | 80 | 79 |
| Wind speed (m/s) | 1.2 | 1.2 | 1.4 | 1.5 | 1.6 | 1.8 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Omura, about 15 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.