Average annual temperature is 16.7 °C
Absolute maximum temperature: 34.5 °C
Absolute minimum temperature: -6.4 °C
Number of sunny days: 156 days
Number of rainy days: 206 days
Number of snow days: 3 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) | 15.7 | 14.2 | 20.6 | 23.4 | 24.7 | 28.9 | 32.4 | 34.5 | 33.2 | 26.5 | 25.0 | 19.8 |
| Average daytime temperature (°C) | 8.7 | 9.3 | 15.1 | 17.9 | 21.6 | 24.7 | 29.3 | 31.2 | 29.4 | 22.0 | 16.7 | 11.8 |
| Average temperature (°C) | 5.4 | 6.0 | 11.6 | 14.4 | 18.4 | 22.3 | 26.5 | 28.1 | 26.3 | 18.5 | 13.6 | 8.7 |
| Average night temperature (°C) | 2.5 | 3.0 | 8.4 | 11.2 | 15.7 | 20.1 | 24.1 | 25.7 | 23.9 | 15.5 | 10.6 | 5.7 |
| Absolute minimum temperature (°C) | -6.4 | -1.3 | 1.8 | 6.4 | 10.9 | 16.2 | 20.8 | 24.1 | 21.4 | 11.0 | 4.0 | -0.3 |
| 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 | 10.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.4 | 14.2 | 13.4 | 12.4 | 11.3 | 10.4 | 9.9 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 7.3 | 6.7 | 8.6 | 7.9 | 9.3 | 6.8 | 10.0 | 10.2 | 9.9 | 8.7 | 7.6 | 7.2 |
| Precipitation (mm) | 51 | 46 | 100 | 198 | 286 | 309 | 97 | 190 | 94 | 36 | 132 | 43 |
| Sunny days | 14 | 12 | 16 | 13 | 17 | 8 | 10 | 6 | 9 | 15 | 15 | 21 |
| Rainy days | 15 | 15 | 15 | 17 | 14 | 22 | 21 | 25 | 21 | 16 | 15 | 10 |
| Snow days | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Iwaya is at