Average annual temperature is 14.7 °C
Absolute maximum temperature: 32.9 °C
Absolute minimum temperature: -12.4 °C
Number of sunny days: 202 days
Number of rainy days: 161 days
Number of snow days: 2 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) | 16.7 | 14.8 | 23.9 | 25.9 | 27.1 | 29.4 | 31.5 | 32.9 | 28.6 | 24.3 | 26.3 | 20.3 |
| Average daytime temperature (°C) | 7.0 | 10.1 | 16.0 | 18.1 | 21.0 | 25.2 | 28.2 | 29.4 | 26.2 | 21.5 | 15.1 | 9.4 |
| Average temperature (°C) | 1.7 | 4.9 | 10.7 | 13.8 | 17.3 | 21.9 | 25.4 | 26.6 | 23.2 | 16.0 | 9.4 | 4.5 |
| Average night temperature (°C) | -2.6 | 0.4 | 5.9 | 9.6 | 13.7 | 18.9 | 22.6 | 24.0 | 20.5 | 11.1 | 4.4 | 0.3 |
| Absolute minimum temperature (°C) | -12.4 | -5.1 | -2.7 | 3.0 | 6.3 | 15.0 | 18.8 | 22.2 | 15.7 | 5.0 | -3.7 | -8.6 |
| 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) | 7.8 | 7.5 | 9.0 | 8.5 | 8.0 | 8.6 | 8.3 | 9.7 | 7.6 | 8.8 | 7.9 | 7.0 |
| Precipitation (mm) | 59 | 42 | 63 | 87 | 238 | 147 | 207 | 230 | 147 | 4 | 37 | 100 |
| Sunny days | 24 | 18 | 22 | 16 | 15 | 14 | 10 | 4 | 6 | 24 | 25 | 24 |
| Rainy days | 6 | 10 | 9 | 14 | 16 | 16 | 21 | 27 | 24 | 7 | 5 | 6 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The largest precipitation sum in Osan is at