Average annual temperature is 14.2 °C
Absolute maximum temperature: 36.0 °C
Absolute minimum temperature: -14.0 °C
Number of sunny days: 168 days
Number of rainy days: 186 days
Number of snow days: 11 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) | 15.8 | 12.6 | 25.6 | 25.2 | 32.1 | 36.0 | 33.1 | 34.3 | 31.3 | 23.2 | 25.2 | 19.2 |
| Average daytime temperature (°C) | 5.0 | 7.8 | 16.5 | 19.7 | 24.6 | 28.3 | 29.6 | 30.7 | 27.1 | 20.7 | 13.3 | 7.7 |
| Average temperature (°C) | 0.2 | 2.0 | 9.1 | 13.5 | 18.7 | 22.8 | 25.9 | 26.5 | 22.7 | 15.2 | 8.6 | 3.9 |
| Average night temperature (°C) | -4.5 | -2.7 | 3.4 | 8.1 | 13.7 | 18.7 | 23.0 | 22.9 | 18.9 | 10.5 | 4.0 | 0.2 |
| Absolute minimum temperature (°C) | -14.0 | -5.7 | -4.2 | 1.5 | 5.0 | 14.6 | 20.0 | 16.2 | 13.4 | 5.8 | -3.3 | -9.7 |
| 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) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 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 | 7.5 | 8.9 | 7.8 | 8.2 | 9.4 | 7.0 | 9.6 | 7.7 | 8.6 | 6.4 | 5.1 |
| Precipitation (mm) | 43 | 9 | 26 | 74 | 149 | 133 | 571 | 233 | 214 | 18 | 96 | 120 |
| Sunny days | 18 | 22 | 23 | 13 | 15 | 15 | 2 | 4 | 10 | 20 | 14 | 12 |
| Rainy days | 9 | 6 | 8 | 17 | 16 | 15 | 29 | 27 | 20 | 11 | 15 | 13 |
| Snow days | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 6 |
The largest precipitation sum in Osan is at