Average annual temperature is 15.7 °C
Absolute maximum temperature: 34.5 °C
Absolute minimum temperature: -7.1 °C
Number of sunny days: 150 days
Number of rainy days: 213 days
Number of snow days: 2 days
Look at detailed online map of Iwaikawa
* Weather data for Iwaikawa 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) | 20.3 | 18.9 | 25.7 | 24.2 | 30.4 | 32.0 | 32.6 | 34.5 | 32.0 | 27.1 | 24.5 | 20.7 |
| Average daytime temperature (°C) | 10.2 | 11.8 | 16.8 | 19.4 | 22.5 | 25.7 | 29.7 | 28.4 | 28.5 | 21.9 | 17.5 | 12.0 |
| Average temperature (°C) | 4.8 | 6.6 | 11.6 | 14.3 | 18.2 | 21.8 | 25.6 | 25.2 | 24.1 | 16.5 | 12.3 | 7.3 |
| Average night temperature (°C) | 1.2 | 2.8 | 7.6 | 10.3 | 14.8 | 19.0 | 22.8 | 23.2 | 21.4 | 12.8 | 8.7 | 4.1 |
| Absolute minimum temperature (°C) | -7.1 | -3.9 | -1.5 | 4.7 | 8.4 | 14.3 | 21.3 | 21.4 | 17.2 | 8.5 | 0.6 | -4.5 |
| 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) | 10.3 | 11.0 | 12.0 | 13.0 | 13.8 | 14.3 | 14.1 | 13.3 | 12.4 | 11.4 | 10.5 | 10.0 |
| Daylight minimum duration (h) | 10.0 | 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) | 7.6 | 6.8 | 7.9 | 7.9 | 8.5 | 6.0 | 9.7 | 8.0 | 9.3 | 8.4 | 8.5 | 6.9 |
| Precipitation (mm) | 58 | 149 | 178 | 189 | 196 | 406 | 133 | 719 | 122 | 67 | 29 | 73 |
| Sunny days | 19 | 14 | 15 | 16 | 14 | 7 | 3 | 0 | 5 | 18 | 21 | 18 |
| Rainy days | 12 | 13 | 16 | 14 | 17 | 23 | 28 | 31 | 25 | 13 | 9 | 12 |
| Snow days | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The largest precipitation sum in Iwaikawa is at