Average annual temperature is 15.8 °C
Absolute maximum temperature: 36.2 °C
Absolute minimum temperature: -7.2 °C
Number of sunny days: 141 days
Number of rainy days: 219 days
Number of snow days: 5 days
Look at detailed online map of Ōiwa
* Weather data for Ōiwa 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) | 16.0 | 15.9 | 22.7 | 25.2 | 26.7 | 30.2 | 34.9 | 36.2 | 33.2 | 25.8 | 25.5 | 19.0 |
| Average daytime temperature (°C) | 8.3 | 9.0 | 15.9 | 18.6 | 22.4 | 25.6 | 31.1 | 32.4 | 30.1 | 21.4 | 16.5 | 11.4 |
| Average temperature (°C) | 3.8 | 4.8 | 10.5 | 13.6 | 17.7 | 21.8 | 26.7 | 27.9 | 25.6 | 16.9 | 12.2 | 7.2 |
| Average night temperature (°C) | 0.3 | 1.4 | 6.0 | 9.5 | 14.0 | 18.4 | 23.3 | 24.6 | 22.3 | 13.3 | 8.8 | 3.6 |
| Absolute minimum temperature (°C) | -7.2 | -2.6 | -0.8 | 4.1 | 8.0 | 12.9 | 19.8 | 23.0 | 19.1 | 8.9 | 1.6 | -2.8 |
| 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 | 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) | 7.1 | 6.1 | 8.5 | 7.9 | 9.3 | 6.7 | 9.6 | 10.0 | 9.8 | 8.8 | 7.4 | 6.9 |
| Precipitation (mm) | 43 | 41 | 106 | 190 | 262 | 334 | 115 | 245 | 77 | 46 | 119 | 48 |
| Sunny days | 8 | 12 | 17 | 15 | 16 | 7 | 8 | 4 | 8 | 13 | 16 | 17 |
| Rainy days | 21 | 13 | 14 | 15 | 15 | 23 | 23 | 27 | 22 | 18 | 14 | 14 |
| Snow days | 2 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Ōiwa is at