Average annual temperature is 14.3 °C
Absolute maximum temperature: 34.8 °C
Absolute minimum temperature: -12.8 °C
Number of sunny days: 174 days
Number of rainy days: 182 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) | 16.3 | 12.8 | 23.9 | 26.4 | 30.8 | 34.8 | 32.5 | 34.7 | 30.7 | 23.1 | 24.3 | 18.5 |
| Average daytime temperature (°C) | 5.4 | 8.8 | 17.1 | 19.3 | 23.6 | 28.8 | 29.4 | 30.9 | 27.2 | 20.3 | 13.1 | 8.0 |
| Average temperature (°C) | 0.4 | 2.8 | 10.0 | 13.3 | 18.4 | 23.0 | 25.9 | 26.7 | 23.0 | 15.3 | 8.4 | 4.0 |
| Average night temperature (°C) | -4.0 | -1.6 | 4.4 | 8.0 | 13.7 | 18.6 | 23.3 | 23.3 | 19.6 | 10.7 | 4.1 | 0.5 |
| Absolute minimum temperature (°C) | -12.8 | -5.2 | -3.4 | 0.7 | 6.7 | 13.7 | 19.8 | 18.1 | 14.2 | 6.0 | -3.5 | -10.0 |
| 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 | 7.1 | 8.7 | 7.2 | 7.6 | 8.9 | 6.4 | 9.6 | 7.4 | 8.3 | 7.2 | 5.7 |
| Precipitation (mm) | 39 | 26 | 49 | 88 | 149 | 197 | 389 | 288 | 192 | 12 | 81 | 87 |
| Sunny days | 21 | 20 | 23 | 12 | 14 | 14 | 3 | 4 | 8 | 22 | 18 | 15 |
| Rainy days | 7 | 8 | 8 | 18 | 17 | 16 | 28 | 27 | 22 | 9 | 12 | 10 |
| Snow days | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6 |
The best time to visit Osan during the most sunny months:
The largest precipitation sum in Osan is at