Average annual temperature is 15.9 °C
Absolute maximum temperature: 35.6 °C
Absolute minimum temperature: -6.2 °C
Number of sunny days: 142 days
Number of rainy days: 219 days
Number of snow days: 4 days
Look at detailed online map of Iwama
* Weather data for Iwama 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) | 15.7 | 16.9 | 25.0 | 26.1 | 30.3 | 30.8 | 35.6 | 34.0 | 33.2 | 27.3 | 25.0 | 21.1 |
| Average daytime temperature (°C) | 11.1 | 12.4 | 16.6 | 19.7 | 22.0 | 25.2 | 31.2 | 31.4 | 29.0 | 21.1 | 18.3 | 14.3 |
| Average temperature (°C) | 5.8 | 7.0 | 11.0 | 14.0 | 17.0 | 20.9 | 26.0 | 26.3 | 24.3 | 15.7 | 12.9 | 9.3 |
| Average night temperature (°C) | 1.5 | 2.5 | 6.5 | 9.4 | 12.8 | 17.6 | 22.0 | 22.8 | 20.9 | 11.1 | 8.6 | 5.3 |
| Absolute minimum temperature (°C) | -5.4 | -6.2 | 0.2 | 3.8 | 6.8 | 13.7 | 19.1 | 20.0 | 14.6 | 6.5 | 2.4 | 1.2 |
| 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) | 7.5 | 7.5 | 8.5 | 8.9 | 9.2 | 7.5 | 9.8 | 10.3 | 9.6 | 9.0 | 7.9 | 7.4 |
| Precipitation (mm) | 128 | 199 | 195 | 171 | 295 | 459 | 80 | 122 | 179 | 121 | 94 | 82 |
| Sunny days | 13 | 15 | 15 | 13 | 11 | 4 | 9 | 4 | 9 | 13 | 17 | 19 |
| Rainy days | 14 | 13 | 16 | 17 | 20 | 26 | 22 | 27 | 21 | 18 | 13 | 12 |
| Snow days | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Iwama is at