Average annual temperature is 12.4 °C
Absolute maximum temperature: 32.3 °C
Absolute minimum temperature: -9.4 °C
Number of sunny days: 112 days
Number of rainy days: 235 days
Number of snow days: 18 days
Look at detailed online map of Iwaya
* Weather data for Iwaya 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) | 11.0 | 10.3 | 21.0 | 22.6 | 27.5 | 26.9 | 31.5 | 32.3 | 30.6 | 21.9 | 21.2 | 14.9 |
| Average daytime temperature (°C) | 2.8 | 4.0 | 11.6 | 14.7 | 18.9 | 22.7 | 27.7 | 29.2 | 26.6 | 17.3 | 12.7 | 7.0 |
| Average temperature (°C) | -0.1 | 0.7 | 7.1 | 10.2 | 14.6 | 18.8 | 23.6 | 25.1 | 22.2 | 13.0 | 8.8 | 3.6 |
| Average night temperature (°C) | -2.6 | -2.2 | 3.3 | 6.7 | 11.2 | 15.7 | 20.5 | 22.2 | 19.3 | 10.0 | 5.9 | 0.9 |
| Absolute minimum temperature (°C) | -9.4 | -8.3 | -3.1 | 0.6 | 4.7 | 9.9 | 17.0 | 20.4 | 13.9 | 4.8 | -1.9 | -4.7 |
| 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) | 5.0 | 5.9 | 7.9 | 7.9 | 9.2 | 7.5 | 9.5 | 10.0 | 9.1 | 8.4 | 6.5 | 5.0 |
| Precipitation (mm) | 182 | 136 | 160 | 231 | 292 | 316 | 278 | 151 | 125 | 131 | 191 | 234 |
| Sunny days | 4 | 8 | 16 | 14 | 14 | 7 | 10 | 5 | 7 | 14 | 7 | 6 |
| Rainy days | 17 | 13 | 15 | 16 | 17 | 23 | 21 | 26 | 23 | 17 | 23 | 24 |
| Snow days | 10 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Iwaya during the most sunny months:
The largest precipitation sum in Iwaya is at