Average annual temperature is 12.5 °C
Absolute maximum temperature: 33.4 °C
Absolute minimum temperature: -11.8 °C
Number of sunny days: 110 days
Number of rainy days: 241 days
Number of snow days: 14 days
Look at detailed online map of Ōsawa
* Weather data for Ōsawa 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) | 11.5 | 11.7 | 19.4 | 22.6 | 27.7 | 27.8 | 33.4 | 32.0 | 28.7 | 21.8 | 20.7 | 15.4 |
| Average daytime temperature (°C) | 4.7 | 6.2 | 12.6 | 16.6 | 19.4 | 22.8 | 28.3 | 28.7 | 25.3 | 17.9 | 13.5 | 8.6 |
| Average temperature (°C) | 0.3 | 1.8 | 7.6 | 10.8 | 14.3 | 18.9 | 23.5 | 24.2 | 21.6 | 13.4 | 9.0 | 4.0 |
| Average night temperature (°C) | -3.4 | -2.0 | 3.1 | 6.1 | 9.9 | 15.5 | 19.5 | 21.3 | 18.9 | 9.4 | 5.3 | 0.5 |
| Absolute minimum temperature (°C) | -11.8 | -5.8 | -3.9 | -0.2 | 2.6 | 9.5 | 16.8 | 19.7 | 11.9 | 5.1 | -1.2 | -5.0 |
| 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 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.8 | 12.0 | 13.1 | 14.1 | 14.6 | 14.4 | 13.5 | 12.4 | 11.3 | 10.2 | 9.7 |
| 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) | 7.3 | 8.0 | 8.0 | 9.0 | 9.1 | 7.7 | 9.9 | 10.1 | 7.7 | 8.5 | 7.7 | 7.4 |
| Precipitation (mm) | 32 | 51 | 112 | 100 | 198 | 339 | 150 | 263 | 237 | 119 | 109 | 41 |
| Sunny days | 11 | 13 | 13 | 15 | 8 | 2 | 2 | 0 | 2 | 13 | 16 | 15 |
| Rainy days | 11 | 12 | 18 | 15 | 23 | 28 | 29 | 31 | 28 | 18 | 14 | 14 |
| Snow days | 9 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
The largest precipitation sum in Ōsawa is at