Average annual temperature is 16.6 °C
Absolute maximum temperature: 32.4 °C
Absolute minimum temperature: -2.5 °C
Number of sunny days: 175 days
Number of rainy days: 189 days
Number of snow days: 1 day
Look at detailed online map of Iwagatani
* Weather data for Iwagatani 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) | 13.1 | 11.6 | 18.9 | 20.9 | 23.4 | 27.8 | 32.0 | 32.4 | 31.2 | 27.0 | 23.0 | 18.0 |
| Average daytime temperature (°C) | 8.3 | 8.4 | 13.7 | 16.8 | 20.4 | 23.5 | 28.7 | 30.0 | 28.9 | 22.1 | 16.7 | 11.5 |
| Average temperature (°C) | 5.9 | 6.0 | 10.8 | 13.9 | 17.7 | 21.3 | 26.0 | 27.5 | 26.3 | 19.4 | 14.4 | 9.3 |
| Average night temperature (°C) | 3.6 | 3.4 | 7.6 | 10.8 | 15.3 | 19.5 | 23.9 | 25.5 | 24.3 | 17.2 | 12.1 | 7.1 |
| Absolute minimum temperature (°C) | -2.5 | 0.5 | 3.6 | 7.3 | 11.6 | 15.4 | 21.9 | 24.1 | 21.8 | 13.3 | 5.8 | 1.1 |
| 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) | 7.4 | 7.1 | 8.5 | 8.3 | 9.2 | 7.1 | 9.9 | 10.3 | 9.8 | 8.8 | 7.7 | 7.3 |
| Precipitation (mm) | 33 | 38 | 79 | 191 | 197 | 247 | 61 | 218 | 41 | 29 | 105 | 34 |
| Sunny days | 15 | 13 | 20 | 15 | 19 | 11 | 15 | 9 | 11 | 15 | 16 | 16 |
| Rainy days | 15 | 15 | 11 | 15 | 12 | 19 | 16 | 22 | 19 | 16 | 14 | 15 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Iwagatani is at