Average annual temperature is 16.8 °C
Absolute maximum temperature: 36.7 °C
Absolute minimum temperature: -4.7 °C
Number of sunny days: 174 days
Number of rainy days: 189 days
Number of snow days: 2 days
Look at detailed online map of Iwamachō
* Weather data for Iwamachō 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) | 14.9 | 18.3 | 23.1 | 22.7 | 28.6 | 30.7 | 36.7 | 35.4 | 33.7 | 28.9 | 25.6 | 22.3 |
| Average daytime temperature (°C) | 9.1 | 10.8 | 16.1 | 19.5 | 21.9 | 25.7 | 32.0 | 32.3 | 29.7 | 22.4 | 18.3 | 13.4 |
| Average temperature (°C) | 4.6 | 6.4 | 12.0 | 15.4 | 17.9 | 22.3 | 27.6 | 28.4 | 26.1 | 18.0 | 13.6 | 8.4 |
| Average night temperature (°C) | 0.8 | 2.7 | 7.9 | 11.8 | 14.4 | 19.5 | 24.2 | 25.4 | 23.4 | 13.8 | 9.6 | 4.0 |
| Absolute minimum temperature (°C) | -4.7 | -1.3 | 2.2 | 5.2 | 9.1 | 14.9 | 21.3 | 23.8 | 17.4 | 9.5 | 3.3 | -1.4 |
| 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 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 6.9 | 7.1 | 7.4 | 8.6 | 8.5 | 7.4 | 10.7 | 11.3 | 9.0 | 8.7 | 7.3 | 7.7 |
| Precipitation (mm) | 23 | 44 | 141 | 129 | 178 | 279 | 45 | 127 | 180 | 120 | 59 | 38 |
| Sunny days | 17 | 16 | 15 | 13 | 16 | 11 | 15 | 6 | 9 | 18 | 16 | 22 |
| Rainy days | 13 | 11 | 16 | 17 | 15 | 19 | 16 | 25 | 21 | 13 | 14 | 9 |
| Snow days | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Iwamachō during the most sunny months:
The largest precipitation sum in Iwamachō is at