Average annual temperature is 17.5 °C
Absolute maximum temperature: 34.1 °C
Absolute minimum temperature: -3.1 °C
Number of sunny days: 127 days
Number of rainy days: 234 days
Number of snow days: 4 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) | 20.0 | 17.5 | 23.6 | 26.1 | 29.4 | 30.7 | 33.3 | 33.6 | 34.1 | 28.2 | 26.2 | 22.7 |
| Average daytime temperature (°C) | 10.1 | 11.9 | 17.4 | 20.1 | 23.7 | 26.3 | 31.0 | 31.4 | 30.4 | 23.4 | 18.6 | 13.0 |
| Average temperature (°C) | 6.9 | 7.6 | 12.8 | 16.0 | 19.6 | 23.1 | 27.5 | 27.7 | 26.3 | 18.5 | 14.3 | 9.3 |
| Average night temperature (°C) | 4.2 | 3.6 | 8.9 | 12.2 | 16.0 | 20.2 | 24.6 | 24.9 | 23.0 | 14.6 | 10.9 | 6.0 |
| Absolute minimum temperature (°C) | -3.1 | -1.9 | 1.1 | 7.4 | 10.3 | 14.9 | 21.2 | 23.0 | 19.7 | 9.0 | 4.4 | -0.1 |
| 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 | 14.3 | 14.1 | 13.4 | 12.4 | 11.4 | 10.5 | 10.0 |
| 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) | 6.8 | 7.2 | 8.7 | 8.2 | 9.1 | 6.2 | 10.1 | 10.0 | 9.9 | 8.8 | 7.7 | 6.7 |
| Precipitation (mm) | 82 | 64 | 108 | 252 | 207 | 379 | 140 | 203 | 82 | 24 | 77 | 94 |
| Sunny days | 13 | 14 | 18 | 14 | 15 | 10 | 3 | 0 | 3 | 18 | 10 | 9 |
| Rainy days | 17 | 14 | 13 | 16 | 16 | 20 | 28 | 31 | 27 | 13 | 20 | 19 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
The largest precipitation sum in Ōshima is at