Average annual temperature is 10.4 °C
Absolute maximum temperature: 31.8 °C
Absolute minimum temperature: -20.0 °C
Number of sunny days: 176 days
Number of rainy days: 173 days
Number of snow days: 16 days
Look at detailed online map of Yachon
* Weather data for Yachon 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) | 10.7 | 11.5 | 21.2 | 23.6 | 27.4 | 31.3 | 31.8 | 31.8 | 29.0 | 19.8 | 20.5 | 13.1 |
| Average daytime temperature (°C) | -0.1 | 4.9 | 12.6 | 15.4 | 20.9 | 24.8 | 27.8 | 28.1 | 24.2 | 16.5 | 7.6 | 1.7 |
| Average temperature (°C) | -4.8 | -0.8 | 5.8 | 9.5 | 15.3 | 19.7 | 23.5 | 23.7 | 19.7 | 11.3 | 3.1 | -2.1 |
| Average night temperature (°C) | -9.4 | -5.0 | -0.3 | 4.1 | 9.9 | 15.0 | 20.0 | 20.1 | 15.9 | 6.9 | -0.9 | -5.4 |
| Absolute minimum temperature (°C) | -20.0 | -8.8 | -7.3 | -3.0 | 0.7 | 10.9 | 14.4 | 15.7 | 7.9 | 0.9 | -10.1 | -17.5 |
| 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 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.9 | 10.8 | 12.0 | 13.2 | 14.2 | 14.7 | 14.5 | 13.6 | 12.4 | 11.2 | 10.2 | 9.6 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 7.0 | 8.0 | 9.1 | 7.5 | 9.4 | 10.0 | 8.1 | 8.8 | 7.6 | 8.1 | 6.9 | 5.9 |
| Precipitation (mm) | 64 | 1 | 24 | 126 | 120 | 204 | 374 | 305 | 147 | 25 | 91 | 86 |
| Sunny days | 19 | 24 | 20 | 13 | 19 | 8 | 4 | 7 | 9 | 19 | 15 | 19 |
| Rainy days | 4 | 1 | 11 | 17 | 12 | 22 | 27 | 24 | 21 | 12 | 13 | 9 |
| Snow days | 8 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 3 |
The largest precipitation sum in Yachon is at