Average annual temperature is 14.7 °C
Absolute maximum temperature: 35.5 °C
Absolute minimum temperature: -14.3 °C
Number of sunny days: 142 days
Number of rainy days: 215 days
Number of snow days: 8 days
Look at detailed online map of Seiwadai
* Weather data for Seiwadai 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) | 14.4 | 13.8 | 21.4 | 24.6 | 25.3 | 27.8 | 32.3 | 35.5 | 32.8 | 25.5 | 24.2 | 19.0 |
| Average daytime temperature (°C) | 6.9 | 7.7 | 14.6 | 17.0 | 20.8 | 23.9 | 28.8 | 30.9 | 28.4 | 20.5 | 15.1 | 10.1 |
| Average temperature (°C) | 2.7 | 3.9 | 9.9 | 12.6 | 16.7 | 20.7 | 25.1 | 26.6 | 24.4 | 16.1 | 11.2 | 6.3 |
| Average night temperature (°C) | -0.9 | 0.3 | 6.1 | 9.0 | 13.4 | 17.9 | 22.2 | 23.6 | 21.6 | 12.4 | 7.8 | 2.8 |
| Absolute minimum temperature (°C) | -14.3 | -4.3 | -2.0 | 3.9 | 6.8 | 13.2 | 18.4 | 22.3 | 18.5 | 7.0 | 0.3 | -3.6 |
| 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 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.4 | 14.2 | 13.4 | 12.4 | 11.3 | 10.4 | 9.9 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 7.0 | 6.7 | 8.4 | 7.9 | 9.1 | 6.8 | 9.7 | 10.2 | 9.8 | 8.8 | 7.5 | 7.1 |
| Precipitation (mm) | 51 | 41 | 100 | 190 | 278 | 311 | 102 | 193 | 67 | 47 | 131 | 38 |
| Sunny days | 10 | 10 | 17 | 14 | 15 | 8 | 10 | 3 | 8 | 14 | 14 | 19 |
| Rainy days | 17 | 14 | 14 | 16 | 16 | 22 | 21 | 28 | 22 | 17 | 16 | 12 |
| Snow days | 4 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Seiwadai is at