Average annual temperature is 14.4 °C
Absolute maximum temperature: 32.5 °C
Absolute minimum temperature: -12.9 °C
Number of sunny days: 198 days
Number of rainy days: 165 days
Number of snow days: 2 days
Look at detailed online map of Onsan-eup
* Weather data for Onsan-eup 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) | 16.0 | 14.3 | 23.2 | 25.4 | 26.1 | 28.6 | 31.0 | 32.5 | 28.1 | 23.9 | 25.1 | 19.7 |
| Average daytime temperature (°C) | 6.6 | 9.7 | 15.4 | 17.5 | 20.4 | 24.7 | 27.7 | 29.0 | 25.8 | 20.9 | 14.4 | 8.9 |
| Average temperature (°C) | 1.6 | 4.8 | 10.5 | 13.5 | 16.9 | 21.4 | 24.9 | 26.1 | 22.8 | 15.7 | 9.2 | 4.2 |
| Average night temperature (°C) | -2.6 | 0.7 | 6.1 | 9.6 | 13.6 | 18.5 | 22.2 | 23.6 | 20.1 | 11.2 | 4.7 | 0.4 |
| Absolute minimum temperature (°C) | -12.9 | -4.3 | -2.6 | 2.1 | 6.8 | 15.3 | 18.4 | 21.9 | 14.7 | 5.1 | -4.2 | -8.9 |
| 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 | 8.4 | 8.0 | 8.5 | 8.1 | 9.7 | 7.6 | 8.8 | 8.0 | 7.1 |
| Precipitation (mm) | 65 | 46 | 66 | 99 | 256 | 175 | 212 | 282 | 159 | 6 | 29 | 119 |
| Sunny days | 25 | 18 | 21 | 17 | 14 | 13 | 7 | 7 | 4 | 24 | 25 | 23 |
| Rainy days | 5 | 10 | 10 | 13 | 17 | 17 | 24 | 24 | 26 | 7 | 5 | 7 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The largest precipitation sum in Onsan-eup is at