Average annual temperature is 14.6 °C
Absolute maximum temperature: 35.9 °C
Absolute minimum temperature: -5.9 °C
Number of sunny days: 90 days
Number of rainy days: 261 days
Number of snow days: 14 days
Look at detailed online map of Seirō
* Weather data for Seirō 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) | 13.7 | 13.4 | 22.3 | 23.3 | 27.2 | 28.3 | 32.4 | 35.9 | 33.5 | 24.3 | 25.3 | 16.7 |
| Average daytime temperature (°C) | 5.4 | 5.8 | 12.4 | 15.6 | 19.6 | 24.1 | 28.5 | 33.3 | 28.4 | 19.5 | 15.1 | 8.6 |
| Average temperature (°C) | 2.9 | 3.3 | 7.8 | 11.5 | 15.5 | 20.9 | 25.2 | 29.3 | 24.8 | 15.9 | 11.6 | 6.0 |
| Average night temperature (°C) | 0.8 | 1.0 | 3.6 | 7.6 | 11.5 | 18.0 | 22.1 | 25.4 | 21.8 | 12.7 | 8.5 | 3.4 |
| Absolute minimum temperature (°C) | -5.9 | -3.4 | -0.9 | 1.0 | 4.3 | 14.1 | 15.8 | 22.9 | 14.8 | 8.7 | 3.7 | -1.1 |
| 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) | 4.6 | 5.1 | 8.2 | 8.0 | 8.5 | 8.3 | 9.6 | 12.0 | 7.8 | 7.9 | 5.9 | 4.0 |
| Precipitation (mm) | 152 | 121 | 108 | 119 | 193 | 211 | 200 | 21 | 204 | 191 | 213 | 277 |
| Sunny days | 0 | 1 | 14 | 13 | 10 | 5 | 12 | 15 | 6 | 5 | 6 | 3 |
| Rainy days | 25 | 20 | 17 | 17 | 21 | 25 | 19 | 16 | 24 | 26 | 24 | 27 |
| Snow days | 6 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Seirō during the most sunny months:
The largest precipitation sum in Seirō is at