Average annual temperature is 17.1 °C
Absolute maximum temperature: 34.5 °C
Absolute minimum temperature: -2.0 °C
Number of sunny days: 173 days
Number of rainy days: 190 days
Number of snow days: 2 days
Look at detailed online map of Seichō
* Weather data for Seichō 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) | 14.0 | 15.4 | 19.5 | 22.3 | 26.7 | 29.3 | 32.5 | 34.5 | 32.7 | 27.1 | 24.9 | 20.4 |
| Average daytime temperature (°C) | 9.2 | 9.6 | 15.2 | 18.0 | 21.9 | 24.8 | 29.9 | 31.8 | 29.9 | 22.9 | 17.5 | 12.0 |
| Average temperature (°C) | 6.2 | 6.3 | 11.5 | 14.5 | 18.6 | 22.1 | 26.9 | 28.5 | 26.7 | 19.3 | 14.2 | 9.1 |
| Average night temperature (°C) | 3.2 | 2.8 | 7.7 | 11.1 | 15.6 | 19.7 | 24.2 | 25.9 | 24.1 | 16.0 | 11.3 | 6.2 |
| Absolute minimum temperature (°C) | -2.0 | -1.8 | 1.3 | 6.7 | 10.2 | 14.6 | 20.8 | 24.6 | 20.4 | 10.7 | 6.6 | 1.7 |
| 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) | 10.2 | 11.0 | 12.0 | 13.0 | 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) | 7.2 | 6.8 | 8.5 | 8.4 | 9.2 | 7.1 | 10.0 | 10.1 | 9.4 | 8.6 | 7.6 | 7.1 |
| Precipitation (mm) | 37 | 41 | 86 | 184 | 213 | 263 | 70 | 201 | 49 | 22 | 67 | 50 |
| Sunny days | 15 | 12 | 18 | 17 | 18 | 12 | 16 | 8 | 13 | 17 | 14 | 13 |
| Rainy days | 15 | 16 | 13 | 13 | 13 | 18 | 15 | 23 | 17 | 14 | 16 | 17 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The largest precipitation sum in Seichō is at