Average annual temperature is 14.6 °C
Absolute maximum temperature: 36.4 °C
Absolute minimum temperature: -6.2 °C
Number of sunny days: 87 days
Number of rainy days: 255 days
Number of snow days: 23 days
Look at detailed online map of Koesawa
* Weather data for Koesawa Japan is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 14.6 | 11.8 | 22.3 | 21.9 | 27.8 | 28.4 | 32.0 | 36.4 | 33.3 | 22.9 | 26.4 | 16.1 |
| Average daytime temperature (°C) | 4.9 | 4.9 | 12.1 | 15.2 | 19.2 | 23.9 | 28.3 | 33.1 | 27.8 | 19.2 | 14.8 | 8.4 |
| Average temperature (°C) | 2.8 | 3.0 | 8.0 | 11.4 | 15.5 | 20.8 | 25.0 | 29.3 | 24.4 | 16.1 | 11.8 | 6.1 |
| Average night temperature (°C) | 1.1 | 1.3 | 4.5 | 8.1 | 12.0 | 18.2 | 22.0 | 25.8 | 21.8 | 13.3 | 9.3 | 3.7 |
| Absolute minimum temperature (°C) | -6.2 | -1.6 | 0.9 | 2.5 | 5.3 | 13.9 | 16.9 | 22.7 | 15.9 | 8.9 | 3.2 | -0.6 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.8 | 10.8 | 12.0 | 13.2 | 14.3 | 14.8 | 14.5 | 13.6 | 12.4 | 11.2 | 10.1 | 9.5 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 4.1 | 4.8 | 8.1 | 7.8 | 8.7 | 8.6 | 9.4 | 11.8 | 7.9 | 7.7 | 5.7 | 3.7 |
| Precipitation (mm) | 198 | 126 | 127 | 155 | 188 | 221 | 314 | 44 | 215 | 239 | 323 | 292 |
| Sunny days | 0 | 2 | 14 | 10 | 11 | 5 | 11 | 18 | 3 | 4 | 6 | 3 |
| Rainy days | 21 | 16 | 17 | 20 | 20 | 25 | 20 | 13 | 27 | 27 | 24 | 25 |
| Snow days | 10 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
The best time to visit Koesawa during the most sunny months:
The largest precipitation sum in Koesawa is at