Average annual temperature is 14.1 °C
Absolute maximum temperature: 36.7 °C
Absolute minimum temperature: -13.6 °C
Number of sunny days: 171 days
Number of rainy days: 184 days
Number of snow days: 10 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 | 12.6 | 25.5 | 27.1 | 33.1 | 36.7 | 32.9 | 33.9 | 31.3 | 23.0 | 25.3 | 18.9 |
| Average daytime temperature (°C) | 5.0 | 8.1 | 17.2 | 20.1 | 24.9 | 29.2 | 29.5 | 30.6 | 27.0 | 20.4 | 12.8 | 7.3 |
| Average temperature (°C) | -0.1 | 2.1 | 9.2 | 13.6 | 18.8 | 23.1 | 25.9 | 26.5 | 22.7 | 14.9 | 8.1 | 3.4 |
| Average night temperature (°C) | -4.4 | -2.7 | 2.8 | 8.0 | 13.7 | 18.7 | 23.1 | 23.1 | 19.0 | 10.0 | 3.5 | -0.3 |
| Absolute minimum temperature (°C) | -13.6 | -6.3 | -4.5 | 0.5 | 4.0 | 14.4 | 20.4 | 16.8 | 13.2 | 5.0 | -4.4 | -10.3 |
| 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 | 14.5 | 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 | 7.4 | 9.0 | 7.6 | 8.2 | 9.6 | 7.0 | 9.3 | 7.6 | 8.6 | 6.9 | 5.5 |
| Precipitation (mm) | 41 | 9 | 27 | 81 | 171 | 169 | 572 | 335 | 246 | 13 | 88 | 127 |
| Sunny days | 19 | 23 | 23 | 16 | 12 | 12 | 2 | 4 | 9 | 23 | 15 | 13 |
| Rainy days | 10 | 5 | 8 | 14 | 19 | 18 | 29 | 27 | 21 | 8 | 14 | 11 |
| Snow days | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 7 |
The largest precipitation sum in Osan is at