Average annual temperature is 11.6 °C
Absolute maximum temperature: 32.5 °C
Absolute minimum temperature: -18.3 °C
Number of sunny days: 166 days
Number of rainy days: 180 days
Number of snow days: 19 days
Look at detailed online map of Osan
* Weather data for Osan South Korea is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 13.8 | 13.6 | 21.0 | 24.0 | 28.7 | 30.7 | 32.5 | 32.1 | 27.9 | 21.8 | 23.8 | 16.6 |
| Average daytime temperature (°C) | 2.2 | 6.1 | 14.0 | 16.4 | 20.9 | 26.0 | 27.8 | 28.5 | 24.3 | 17.8 | 10.3 | 4.5 |
| Average temperature (°C) | -2.5 | 0.4 | 7.5 | 10.6 | 15.9 | 20.8 | 23.8 | 24.3 | 20.3 | 12.5 | 5.1 | 0.1 |
| Average night temperature (°C) | -6.4 | -3.4 | 2.4 | 5.5 | 11.4 | 16.6 | 21.0 | 21.2 | 17.2 | 8.3 | 0.7 | -3.3 |
| Absolute minimum temperature (°C) | -18.3 | -9.1 | -5.2 | -1.1 | 4.2 | 13.1 | 17.0 | 17.6 | 12.3 | 3.2 | -9.4 | -14.3 |
| 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) | 10.0 | 10.9 | 12.0 | 13.1 | 14.1 | 14.6 | 14.3 | 13.5 | 12.4 | 11.3 | 10.3 | 9.8 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.2 | 7.4 | 8.8 | 8.1 | 8.2 | 9.9 | 7.1 | 9.2 | 7.4 | 9.0 | 7.6 | 6.1 |
| Precipitation (mm) | 41 | 18 | 46 | 76 | 132 | 155 | 392 | 335 | 179 | 9 | 70 | 109 |
| Sunny days | 19 | 18 | 19 | 13 | 16 | 10 | 4 | 4 | 7 | 23 | 17 | 16 |
| Rainy days | 6 | 4 | 12 | 17 | 15 | 20 | 27 | 27 | 23 | 8 | 12 | 9 |
| Snow days | 6 | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 6 |
The largest precipitation sum in Osan is at