Average annual temperature is 13.8 °C
Absolute maximum temperature: 35.6 °C
Absolute minimum temperature: -9.1 °C
Number of sunny days: 140 days
Number of rainy days: 214 days
Number of snow days: 11 days
Look at detailed online map of Iwanuma
* Weather data for Iwanuma 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) | 14.5 | 15.4 | 21.5 | 25.1 | 30.9 | 31.0 | 35.2 | 35.6 | 32.5 | 25.1 | 24.7 | 17.1 |
| Average daytime temperature (°C) | 5.9 | 7.2 | 13.9 | 18.1 | 20.5 | 24.8 | 29.8 | 32.0 | 27.9 | 20.6 | 15.2 | 9.5 |
| Average temperature (°C) | 1.4 | 2.2 | 7.5 | 12.0 | 15.3 | 20.7 | 25.3 | 27.8 | 23.9 | 14.7 | 9.9 | 4.4 |
| Average night temperature (°C) | -2.4 | -2.0 | 1.8 | 6.5 | 10.2 | 17.1 | 21.3 | 24.2 | 20.7 | 9.7 | 5.8 | 0.6 |
| Absolute minimum temperature (°C) | -9.1 | -5.6 | -4.8 | -0.7 | 2.0 | 11.6 | 16.8 | 21.7 | 13.3 | 5.5 | -3.4 | -5.0 |
| 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 | 14.8 | 14.5 | 13.6 | 12.4 | 11.2 | 10.1 | 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) | 6.5 | 7.3 | 8.3 | 9.0 | 8.2 | 7.4 | 9.5 | 11.7 | 7.7 | 8.7 | 6.9 | 6.8 |
| Precipitation (mm) | 29 | 62 | 83 | 55 | 145 | 211 | 96 | 65 | 249 | 49 | 74 | 69 |
| Sunny days | 15 | 13 | 18 | 20 | 12 | 7 | 8 | 4 | 3 | 15 | 11 | 14 |
| Rainy days | 10 | 11 | 13 | 10 | 19 | 23 | 23 | 27 | 27 | 16 | 19 | 16 |
| Snow days | 6 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Iwanuma during the most sunny months:
The largest precipitation sum in Iwanuma is at