Average annual temperature is 10.9 °C
Absolute maximum temperature: 35.3 °C
Absolute minimum temperature: -12.0 °C
Number of sunny days: 85 days
Number of rainy days: 231 days
Number of snow days: 49 days
Look at detailed online map of Iwatari
* Weather data for Iwatari 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) | 8.6 | 8.3 | 18.4 | 20.5 | 25.2 | 28.5 | 31.5 | 35.3 | 29.9 | 21.3 | 21.7 | 11.8 |
| Average daytime temperature (°C) | -0.9 | 0.5 | 9.1 | 13.2 | 17.7 | 22.8 | 26.3 | 30.6 | 25.1 | 16.7 | 10.4 | 2.5 |
| Average temperature (°C) | -2.9 | -1.6 | 4.3 | 8.8 | 13.1 | 18.6 | 22.8 | 26.7 | 21.1 | 12.7 | 7.0 | 0.0 |
| Average night temperature (°C) | -5.0 | -3.7 | 0.5 | 5.3 | 9.2 | 15.3 | 19.9 | 23.7 | 17.9 | 9.6 | 4.2 | -2.7 |
| Absolute minimum temperature (°C) | -12.0 | -10.2 | -6.3 | -2.3 | 2.7 | 10.6 | 14.4 | 21.6 | 10.5 | 3.4 | -4.0 | -9.2 |
| 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 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.7 | 11.9 | 13.3 | 14.5 | 15.0 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.3 |
| 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) | 4.9 | 5.9 | 8.6 | 8.6 | 9.8 | 8.5 | 10.0 | 11.3 | 8.0 | 8.3 | 5.0 | 4.1 |
| Precipitation (mm) | 154 | 157 | 86 | 160 | 132 | 131 | 224 | 52 | 126 | 171 | 240 | 142 |
| Sunny days | 1 | 1 | 16 | 9 | 15 | 8 | 3 | 6 | 9 | 10 | 5 | 2 |
| Rainy days | 9 | 13 | 14 | 21 | 16 | 22 | 28 | 25 | 21 | 21 | 24 | 17 |
| Snow days | 21 | 14 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 12 |
The best time to visit Iwatari during the most sunny months:
The largest precipitation sum in Iwatari is at