Average annual temperature is 14.3 °C
Absolute maximum temperature: 33.6 °C
Absolute minimum temperature: -9.1 °C
Number of sunny days: 131 days
Number of rainy days: 225 days
Number of snow days: 9 days
Look at detailed online map of Ōsumi
* Weather data for Ōsumi 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) | 14.7 | 13.6 | 21.3 | 23.7 | 25.8 | 28.7 | 32.0 | 33.6 | 30.8 | 23.5 | 23.4 | 18.1 |
| Average daytime temperature (°C) | 6.2 | 7.5 | 14.1 | 17.0 | 20.6 | 24.0 | 29.2 | 29.8 | 27.8 | 19.6 | 15.0 | 10.0 |
| Average temperature (°C) | 2.6 | 3.7 | 9.5 | 12.3 | 16.3 | 20.3 | 24.7 | 25.5 | 23.3 | 15.2 | 10.8 | 6.2 |
| Average night temperature (°C) | -0.8 | 0.3 | 5.5 | 8.4 | 12.7 | 17.2 | 21.3 | 22.6 | 20.1 | 11.8 | 7.3 | 3.2 |
| Absolute minimum temperature (°C) | -9.1 | -4.2 | -1.7 | 3.1 | 6.5 | 12.4 | 18.0 | 19.8 | 15.8 | 7.6 | 1.9 | -2.5 |
| 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) | 6.9 | 7.0 | 8.6 | 8.1 | 9.1 | 6.9 | 10.1 | 9.6 | 9.8 | 8.7 | 7.3 | 6.9 |
| Precipitation (mm) | 112 | 53 | 123 | 252 | 257 | 497 | 68 | 196 | 105 | 81 | 130 | 70 |
| Sunny days | 9 | 13 | 15 | 11 | 14 | 10 | 9 | 2 | 9 | 16 | 13 | 10 |
| Rainy days | 17 | 13 | 16 | 19 | 17 | 20 | 22 | 29 | 21 | 15 | 17 | 19 |
| Snow days | 5 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
The largest precipitation sum in Ōsumi is at