Average annual temperature is 17.0 °C
Absolute maximum temperature: 36.5 °C
Absolute minimum temperature: -4.5 °C
Number of sunny days: 146 days
Number of rainy days: 218 days
Number of snow days: 1 day
Look at detailed online map of Kōseki
* Weather data for Kōseki 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) | 16.2 | 19.9 | 23.9 | 26.2 | 30.9 | 31.5 | 36.5 | 35.1 | 33.8 | 32.2 | 26.1 | 23.6 |
| Average daytime temperature (°C) | 9.8 | 11.3 | 16.5 | 20.1 | 21.9 | 26.0 | 31.6 | 32.1 | 29.9 | 22.8 | 19.2 | 13.9 |
| Average temperature (°C) | 5.2 | 7.0 | 12.2 | 15.7 | 18.0 | 22.2 | 27.0 | 27.8 | 26.0 | 18.2 | 14.6 | 9.1 |
| Average night temperature (°C) | 1.3 | 3.1 | 8.6 | 12.3 | 14.8 | 19.2 | 23.4 | 24.8 | 23.4 | 14.2 | 11.1 | 5.1 |
| Absolute minimum temperature (°C) | -4.5 | -2.6 | 1.3 | 5.5 | 10.0 | 15.4 | 20.4 | 20.7 | 18.8 | 10.1 | 5.5 | -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 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 6.7 | 6.7 | 7.4 | 8.9 | 8.4 | 7.0 | 10.8 | 11.5 | 8.8 | 8.6 | 7.2 | 7.3 |
| Precipitation (mm) | 46 | 73 | 140 | 134 | 149 | 257 | 47 | 96 | 217 | 127 | 72 | 44 |
| Sunny days | 19 | 14 | 10 | 12 | 11 | 8 | 16 | 3 | 4 | 14 | 15 | 20 |
| Rainy days | 12 | 13 | 21 | 18 | 20 | 22 | 15 | 28 | 26 | 17 | 15 | 11 |
| Snow days | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Kōseki during the most sunny months:
The largest precipitation sum in Kōseki is at