Average annual temperature is 15.6 °C
Absolute maximum temperature: 36.6 °C
Absolute minimum temperature: -11.1 °C
Number of sunny days: 149 days
Number of rainy days: 211 days
Number of snow days: 5 days
Look at detailed online map of Iwayama
* Weather data for Iwayama 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) | 16.6 | 15.0 | 22.6 | 25.0 | 26.9 | 29.5 | 34.3 | 36.6 | 33.1 | 24.7 | 25.8 | 20.2 |
| Average daytime temperature (°C) | 8.0 | 8.9 | 16.0 | 18.8 | 22.4 | 25.3 | 31.1 | 32.3 | 29.9 | 21.1 | 16.5 | 11.4 |
| Average temperature (°C) | 3.5 | 4.6 | 10.4 | 13.5 | 17.6 | 21.6 | 26.6 | 27.9 | 25.3 | 16.2 | 11.8 | 6.8 |
| Average night temperature (°C) | -0.5 | 0.8 | 5.7 | 9.0 | 13.6 | 18.3 | 22.9 | 24.6 | 21.7 | 12.1 | 8.0 | 2.8 |
| Absolute minimum temperature (°C) | -11.1 | -2.8 | -1.1 | 3.2 | 6.8 | 12.2 | 18.3 | 22.9 | 17.2 | 7.5 | 1.8 | -3.3 |
| 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 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 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) | 7.0 | 6.1 | 8.5 | 7.9 | 9.5 | 6.8 | 10.1 | 10.0 | 10.0 | 8.6 | 7.3 | 7.0 |
| Precipitation (mm) | 53 | 46 | 110 | 155 | 226 | 377 | 119 | 196 | 115 | 53 | 116 | 40 |
| Sunny days | 9 | 10 | 17 | 14 | 14 | 10 | 10 | 8 | 7 | 18 | 16 | 16 |
| Rainy days | 20 | 15 | 14 | 16 | 17 | 20 | 21 | 23 | 23 | 13 | 14 | 15 |
| Snow days | 2 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Iwayama is at