Average annual temperature is 14.7 °C
Absolute maximum temperature: 39.0 °C
Absolute minimum temperature: -6.5 °C
Number of sunny days: 106 days
Number of rainy days: 243 days
Number of snow days: 16 days
Look at detailed online map of Iwamuro-onsen
* Weather data for Iwamuro-onsen 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) | 15.6 | 13.2 | 23.6 | 22.8 | 27.2 | 28.6 | 32.1 | 39.0 | 33.9 | 24.2 | 26.1 | 16.9 |
| Average daytime temperature (°C) | 5.7 | 6.2 | 12.7 | 15.5 | 19.7 | 24.1 | 28.6 | 34.3 | 28.7 | 19.8 | 15.3 | 8.9 |
| Average temperature (°C) | 2.9 | 3.3 | 7.9 | 11.3 | 15.7 | 20.8 | 25.4 | 29.9 | 25.0 | 16.2 | 11.7 | 6.0 |
| Average night temperature (°C) | 0.6 | 0.6 | 3.7 | 7.4 | 11.8 | 18.1 | 22.4 | 25.9 | 22.3 | 13.1 | 8.7 | 3.2 |
| Absolute minimum temperature (°C) | -5.6 | -6.5 | -1.9 | 1.7 | 4.9 | 14.6 | 16.8 | 23.9 | 16.8 | 9.1 | 2.9 | -1.8 |
| 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 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.9 | 10.8 | 12.0 | 13.2 | 14.2 | 14.7 | 14.5 | 13.6 | 12.4 | 11.2 | 10.2 | 9.6 |
| 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) | 4.7 | 5.2 | 8.0 | 8.2 | 8.3 | 8.1 | 9.5 | 11.9 | 7.9 | 7.8 | 6.3 | 4.2 |
| Precipitation (mm) | 131 | 115 | 106 | 98 | 180 | 227 | 154 | 37 | 191 | 171 | 193 | 260 |
| Sunny days | 2 | 5 | 15 | 14 | 11 | 9 | 13 | 16 | 4 | 7 | 7 | 3 |
| Rainy days | 21 | 16 | 16 | 16 | 20 | 21 | 18 | 15 | 26 | 24 | 23 | 27 |
| Snow days | 8 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Iwamuro-onsen during the most sunny months:
The largest precipitation sum in Iwamuro-onsen is at