Average annual temperature is 13.3 °C
Absolute maximum temperature: 36.9 °C
Absolute minimum temperature: -7.8 °C
Number of sunny days: 103 days
Number of rainy days: 240 days
Number of snow days: 22 days
Look at detailed online map of Iwai
* Weather data for Iwai 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) | 12.8 | 10.5 | 20.9 | 24.9 | 30.3 | 28.5 | 32.3 | 36.9 | 35.3 | 23.7 | 24.5 | 16.6 |
| Average daytime temperature (°C) | 4.4 | 4.5 | 12.2 | 17.1 | 20.6 | 24.2 | 28.8 | 33.8 | 28.8 | 19.0 | 14.7 | 8.6 |
| Average temperature (°C) | 0.8 | 1.6 | 6.7 | 11.2 | 15.2 | 19.9 | 24.4 | 27.7 | 23.6 | 13.7 | 9.4 | 4.0 |
| Average night temperature (°C) | -2.0 | -1.0 | 2.4 | 6.6 | 10.8 | 16.3 | 20.5 | 23.2 | 19.9 | 9.2 | 5.3 | -0.3 |
| Absolute minimum temperature (°C) | -7.5 | -5.0 | -3.0 | 0.8 | 1.5 | 10.7 | 17.1 | 20.7 | 13.7 | 5.5 | -1.0 | -7.8 |
| 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 | 14.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.0 | 10.8 | 12.0 | 13.1 | 14.1 | 14.6 | 14.4 | 13.5 | 12.4 | 11.2 | 10.2 | 9.7 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 5.5 | 5.7 | 8.2 | 8.5 | 9.1 | 8.0 | 9.8 | 11.5 | 8.8 | 8.8 | 6.8 | 6.6 |
| Precipitation (mm) | 289 | 213 | 109 | 152 | 182 | 210 | 163 | 22 | 145 | 125 | 223 | 353 |
| Sunny days | 5 | 5 | 15 | 13 | 13 | 4 | 10 | 9 | 5 | 10 | 9 | 5 |
| Rainy days | 14 | 15 | 16 | 17 | 18 | 26 | 21 | 22 | 25 | 21 | 21 | 24 |
| Snow days | 12 | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
The best time to visit Iwai during the most sunny months:
The largest precipitation sum in Iwai is at