Average annual temperature is 15.6 °C
Absolute maximum temperature: 37.1 °C
Absolute minimum temperature: -7.6 °C
Number of sunny days: 170 days
Number of rainy days: 190 days
Number of snow days: 5 days
Look at detailed online map of Iruma
* Weather data for Iruma 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) | 12.4 | 18.4 | 23.2 | 26.5 | 31.8 | 30.5 | 37.1 | 35.8 | 33.1 | 25.8 | 24.9 | 18.3 |
| Average daytime temperature (°C) | 7.9 | 10.3 | 16.1 | 20.1 | 22.3 | 25.4 | 32.0 | 32.2 | 29.0 | 21.4 | 16.8 | 11.9 |
| Average temperature (°C) | 3.2 | 5.1 | 10.9 | 14.4 | 17.2 | 21.5 | 26.8 | 27.3 | 24.8 | 16.6 | 11.9 | 6.9 |
| Average night temperature (°C) | -0.6 | 1.1 | 6.7 | 9.9 | 13.0 | 18.4 | 22.7 | 23.7 | 21.7 | 12.5 | 8.3 | 2.6 |
| Absolute minimum temperature (°C) | -7.6 | -3.5 | -1.1 | 2.6 | 6.7 | 13.8 | 19.4 | 22.1 | 16.4 | 7.3 | 1.2 | -3.5 |
| 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) | 10.0 | 10.9 | 12.0 | 13.1 | 14.1 | 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) | 7.3 | 8.0 | 7.7 | 8.7 | 8.8 | 7.4 | 10.2 | 11.0 | 8.6 | 8.5 | 7.4 | 7.7 |
| Precipitation (mm) | 31 | 41 | 127 | 80 | 189 | 310 | 49 | 218 | 237 | 108 | 63 | 32 |
| Sunny days | 19 | 17 | 16 | 14 | 13 | 6 | 12 | 8 | 9 | 17 | 18 | 21 |
| Rainy days | 9 | 10 | 15 | 16 | 18 | 24 | 19 | 23 | 21 | 14 | 12 | 9 |
| Snow days | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Iruma during the most sunny months:
The largest precipitation sum in Iruma is at