Average annual temperature is 13.9 °C
Absolute maximum temperature: 36.0 °C
Absolute minimum temperature: -14.1 °C
Number of sunny days: 182 days
Number of rainy days: 174 days
Number of snow days: 9 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) | 15.1 | 11.9 | 26.3 | 27.9 | 31.7 | 36.0 | 33.0 | 35.0 | 31.0 | 23.3 | 25.4 | 19.1 |
| Average daytime temperature (°C) | 4.8 | 8.0 | 16.5 | 19.7 | 24.7 | 28.3 | 29.1 | 30.8 | 26.9 | 20.6 | 12.8 | 7.2 |
| Average temperature (°C) | -0.3 | 1.9 | 8.9 | 13.4 | 18.6 | 22.7 | 25.5 | 26.5 | 22.7 | 14.9 | 8.1 | 3.1 |
| Average night temperature (°C) | -4.9 | -2.7 | 3.0 | 8.0 | 13.7 | 18.7 | 22.7 | 23.2 | 19.3 | 10.1 | 3.6 | -0.6 |
| Absolute minimum temperature (°C) | -14.1 | -5.9 | -5.1 | 1.2 | 5.3 | 14.6 | 20.3 | 18.3 | 14.1 | 5.2 | -4.6 | -10.8 |
| 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) | 7.3 | 7.6 | 9.0 | 7.8 | 8.5 | 9.8 | 7.1 | 9.4 | 7.5 | 8.4 | 6.8 | 5.5 |
| Precipitation (mm) | 40 | 6 | 28 | 85 | 164 | 252 | 674 | 318 | 217 | 15 | 87 | 126 |
| Sunny days | 20 | 23 | 24 | 16 | 13 | 14 | 1 | 6 | 11 | 22 | 17 | 15 |
| Rainy days | 9 | 4 | 7 | 14 | 18 | 16 | 30 | 25 | 19 | 9 | 12 | 11 |
| Snow days | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 5 |
The largest precipitation sum in Osan is at