Average annual temperature is 10.9 °C
Absolute maximum temperature: 34.0 °C
Absolute minimum temperature: -13.0 °C
Number of sunny days: 93 days
Number of rainy days: 219 days
Number of snow days: 53 days
Look at detailed online map of Sōmai
* Weather data for Sōmai 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) | 10.8 | 8.4 | 18.9 | 22.1 | 26.9 | 28.6 | 31.8 | 34.0 | 31.7 | 21.8 | 22.2 | 13.5 |
| Average daytime temperature (°C) | 0.0 | 0.8 | 10.8 | 14.2 | 18.3 | 23.2 | 27.2 | 30.8 | 25.3 | 17.3 | 10.8 | 3.3 |
| Average temperature (°C) | -3.3 | -2.2 | 4.9 | 9.0 | 13.1 | 18.6 | 23.1 | 26.0 | 20.9 | 12.4 | 7.0 | -0.1 |
| Average night temperature (°C) | -6.0 | -5.2 | 0.7 | 5.3 | 9.2 | 15.3 | 20.0 | 22.6 | 17.9 | 9.1 | 4.0 | -3.0 |
| Absolute minimum temperature (°C) | -13.0 | -9.8 | -6.1 | -0.7 | 1.4 | 9.2 | 15.3 | 20.6 | 10.4 | 2.7 | -4.7 | -9.2 |
| 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 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.7 | 10.7 | 11.9 | 13.3 | 14.4 | 15.0 | 14.7 | 13.7 | 12.5 | 11.1 | 10.0 | 9.4 |
| 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) | 6.1 | 6.2 | 8.4 | 8.9 | 9.1 | 8.3 | 9.4 | 10.5 | 7.8 | 8.4 | 5.8 | 5.0 |
| Precipitation (mm) | 57 | 59 | 79 | 98 | 117 | 154 | 171 | 113 | 171 | 104 | 129 | 100 |
| Sunny days | 6 | 4 | 18 | 10 | 9 | 6 | 5 | 7 | 5 | 8 | 8 | 7 |
| Rainy days | 5 | 6 | 12 | 20 | 22 | 24 | 26 | 24 | 25 | 23 | 18 | 14 |
| Snow days | 20 | 18 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 10 |
The best time to visit Sōmai during the most sunny months:
The largest precipitation sum in Sōmai is at