Average annual temperature is 15.0 °C
Absolute maximum temperature: 34.8 °C
Absolute minimum temperature: -11.5 °C
Number of sunny days: 161 days
Number of rainy days: 199 days
Number of snow days: 5 days
Look at detailed online map of Iwasaki
* Weather data for Iwasaki 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) | 17.2 | 13.9 | 20.2 | 24.6 | 27.8 | 29.0 | 33.6 | 34.8 | 32.3 | 26.3 | 24.6 | 19.3 |
| Average daytime temperature (°C) | 8.2 | 9.1 | 15.3 | 18.0 | 21.8 | 25.0 | 29.5 | 31.3 | 28.9 | 21.5 | 16.1 | 10.3 |
| Average temperature (°C) | 2.9 | 4.2 | 10.0 | 13.1 | 17.3 | 21.1 | 25.8 | 27.1 | 24.4 | 16.1 | 11.1 | 5.7 |
| Average night temperature (°C) | -1.3 | 0.0 | 5.0 | 8.6 | 13.3 | 17.6 | 22.4 | 23.6 | 21.0 | 11.7 | 7.0 | 2.0 |
| Absolute minimum temperature (°C) | -11.5 | -4.7 | -4.5 | 3.7 | 6.7 | 12.0 | 19.2 | 21.5 | 17.6 | 7.1 | -0.7 | -5.3 |
| 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 | 8.5 | 7.9 | 8.8 | 7.9 | 9.4 | 10.1 | 9.4 | 8.6 | 8.1 | 6.9 |
| Precipitation (mm) | 44 | 68 | 82 | 195 | 231 | 218 | 125 | 158 | 74 | 17 | 42 | 52 |
| Sunny days | 17 | 14 | 17 | 15 | 14 | 11 | 8 | 4 | 5 | 23 | 18 | 15 |
| Rainy days | 12 | 13 | 14 | 15 | 17 | 19 | 23 | 27 | 25 | 8 | 12 | 14 |
| Snow days | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
The largest precipitation sum in Iwasaki is at