Average annual temperature is 16.1 °C
Absolute maximum temperature: 36.8 °C
Absolute minimum temperature: -6.2 °C
Number of sunny days: 157 days
Number of rainy days: 205 days
Number of snow days: 3 days
Look at detailed online map of Iwakura
* Weather data for Iwakura 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) | 15.5 | 16.0 | 22.8 | 26.9 | 29.9 | 30.8 | 35.8 | 36.8 | 33.4 | 25.8 | 25.5 | 20.0 |
| Average daytime temperature (°C) | 9.2 | 10.4 | 17.3 | 19.8 | 23.7 | 26.6 | 31.7 | 32.5 | 30.1 | 22.1 | 17.4 | 12.2 |
| Average temperature (°C) | 3.6 | 5.1 | 11.0 | 14.4 | 18.5 | 22.5 | 27.1 | 28.1 | 25.8 | 16.8 | 12.2 | 7.0 |
| Average night temperature (°C) | -0.9 | 1.0 | 5.6 | 9.5 | 13.9 | 18.9 | 23.0 | 24.7 | 22.4 | 12.5 | 8.0 | 2.9 |
| Absolute minimum temperature (°C) | -6.2 | -4.7 | -0.7 | 3.6 | 6.7 | 12.2 | 17.9 | 22.6 | 18.2 | 7.6 | 1.4 | -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 | 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) | 7.7 | 7.5 | 8.5 | 8.2 | 9.0 | 7.4 | 10.4 | 10.4 | 9.5 | 8.5 | 8.1 | 7.3 |
| Precipitation (mm) | 32 | 67 | 120 | 154 | 250 | 375 | 210 | 226 | 161 | 90 | 92 | 80 |
| Sunny days | 17 | 16 | 17 | 14 | 14 | 9 | 9 | 4 | 8 | 17 | 17 | 15 |
| Rainy days | 12 | 12 | 14 | 16 | 17 | 21 | 22 | 27 | 22 | 14 | 13 | 15 |
| Snow days | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The largest precipitation sum in Iwakura is at