Average annual temperature is 16.8 °C
Absolute maximum temperature: 34.2 °C
Absolute minimum temperature: -4.4 °C
Number of sunny days: 173 days
Number of rainy days: 192 days
Look at detailed online map of Ōshima
* Weather data for Ōshima 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) | 16.2 | 15.4 | 20.5 | 22.9 | 26.6 | 28.3 | 32.3 | 34.2 | 32.7 | 28.6 | 24.8 | 20.2 |
| Average daytime temperature (°C) | 9.5 | 10.3 | 15.5 | 18.3 | 21.8 | 24.7 | 28.5 | 30.9 | 29.1 | 22.9 | 17.5 | 12.0 |
| Average temperature (°C) | 6.4 | 7.0 | 11.3 | 14.5 | 18.2 | 21.6 | 25.8 | 27.7 | 26.0 | 19.2 | 14.4 | 9.0 |
| Average night temperature (°C) | 3.5 | 3.9 | 7.6 | 11.1 | 15.4 | 19.1 | 23.7 | 25.3 | 23.6 | 16.3 | 11.5 | 6.2 |
| Absolute minimum temperature (°C) | -4.4 | 0.4 | 1.3 | 7.0 | 10.1 | 13.6 | 19.2 | 23.7 | 21.2 | 12.7 | 5.3 | -1.0 |
| 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 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.2 | 11.0 | 12.0 | 13.0 | 13.9 | 14.4 | 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) | 7.6 | 6.8 | 8.5 | 8.1 | 9.1 | 7.5 | 9.3 | 10.1 | 9.4 | 8.5 | 8.3 | 6.9 |
| Precipitation (mm) | 68 | 61 | 124 | 252 | 281 | 255 | 155 | 119 | 68 | 20 | 48 | 80 |
| Sunny days | 15 | 14 | 17 | 17 | 15 | 10 | 12 | 11 | 6 | 21 | 18 | 17 |
| Rainy days | 16 | 14 | 14 | 13 | 16 | 20 | 19 | 20 | 24 | 10 | 12 | 14 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Ōshima is at