Average annual temperature is 18.3 °C
Absolute maximum temperature: 28.9 °C
Absolute minimum temperature: 2.0 °C
Number of sunny days: 156 days
Number of rainy days: 208 days
Number of snow days: 1 day
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) | 18.3 | 18.1 | 19.3 | 20.3 | 22.0 | 25.0 | 28.1 | 28.9 | 28.7 | 27.4 | 24.1 | 20.2 |
| Average daytime temperature (°C) | 11.2 | 12.0 | 15.4 | 17.7 | 19.6 | 22.4 | 25.6 | 27.9 | 27.1 | 22.2 | 18.7 | 14.2 |
| Average temperature (°C) | 9.6 | 10.3 | 14.1 | 16.3 | 18.6 | 21.6 | 24.9 | 27.0 | 26.1 | 20.7 | 17.0 | 12.5 |
| Average night temperature (°C) | 7.7 | 8.2 | 12.1 | 14.3 | 17.4 | 20.7 | 24.1 | 25.8 | 24.9 | 18.9 | 15.1 | 10.6 |
| Absolute minimum temperature (°C) | 2.0 | 4.2 | 7.2 | 10.8 | 13.3 | 17.9 | 22.0 | 23.0 | 21.4 | 16.0 | 10.2 | 5.4 |
| 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 | 10.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 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) | 6.2 | 7.1 | 7.4 | 8.8 | 8.9 | 7.2 | 10.7 | 10.9 | 9.2 | 8.6 | 7.5 | 7.6 |
| Precipitation (mm) | 79 | 130 | 231 | 231 | 202 | 259 | 45 | 247 | 298 | 221 | 154 | 72 |
| Sunny days | 9 | 10 | 13 | 13 | 13 | 11 | 22 | 10 | 10 | 11 | 14 | 20 |
| Rainy days | 21 | 18 | 18 | 17 | 18 | 19 | 9 | 21 | 20 | 20 | 16 | 11 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Ōshima during the most sunny months:
The largest precipitation sum in Ōshima is at