Average annual temperature is 12.6 °C
Absolute maximum temperature: 37.4 °C
Absolute minimum temperature: -8.7 °C
Number of sunny days: 80 days
Number of rainy days: 255 days
Number of snow days: 30 days
Look at detailed online map of Ōishizawa
* Weather data for Ōishizawa 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) | 11.8 | 10.4 | 17.8 | 25.0 | 30.8 | 27.6 | 33.1 | 37.4 | 34.8 | 24.3 | 24.9 | 16.1 |
| Average daytime temperature (°C) | 2.6 | 3.2 | 10.6 | 16.4 | 19.8 | 24.1 | 28.7 | 33.6 | 28.0 | 18.4 | 13.5 | 7.2 |
| Average temperature (°C) | -0.2 | 0.4 | 4.7 | 9.9 | 14.4 | 19.6 | 24.2 | 27.6 | 23.2 | 13.7 | 9.1 | 3.5 |
| Average night temperature (°C) | -2.6 | -2.3 | 0.0 | 5.0 | 9.7 | 15.9 | 20.3 | 23.1 | 20.0 | 10.3 | 5.9 | 0.4 |
| Absolute minimum temperature (°C) | -8.7 | -6.2 | -3.1 | -3.2 | 1.5 | 11.0 | 16.6 | 20.9 | 13.4 | 7.0 | 0.7 | -6.6 |
| 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) | 9.9 | 10.8 | 12.0 | 13.2 | 14.2 | 14.8 | 14.5 | 13.6 | 12.4 | 11.2 | 10.1 | 9.6 |
| 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) | 3.3 | 4.9 | 8.0 | 8.0 | 8.3 | 8.0 | 9.4 | 11.7 | 8.0 | 8.1 | 5.5 | 3.8 |
| Precipitation (mm) | 234 | 215 | 115 | 120 | 169 | 218 | 176 | 52 | 143 | 153 | 261 | 259 |
| Sunny days | 1 | 2 | 17 | 13 | 11 | 5 | 4 | 5 | 7 | 8 | 5 | 2 |
| Rainy days | 15 | 15 | 13 | 17 | 20 | 25 | 27 | 26 | 23 | 23 | 25 | 26 |
| Snow days | 15 | 11 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
The best time to visit Ōishizawa during the most sunny months:
The largest precipitation sum in Ōishizawa is at