Average annual temperature is 15.6 °C
Absolute maximum temperature: 34.8 °C
Absolute minimum temperature: -10.1 °C
Number of sunny days: 190 days
Number of rainy days: 172 days
Number of snow days: 3 days
Look at detailed online map of Isu
* Weather data for Isu 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) | 14.7 | 12.6 | 22.4 | 24.5 | 24.6 | 29.3 | 32.9 | 34.8 | 30.0 | 24.3 | 26.2 | 19.4 |
| Average daytime temperature (°C) | 6.7 | 9.8 | 15.4 | 17.5 | 20.9 | 25.3 | 28.4 | 30.4 | 26.9 | 22.0 | 15.1 | 9.7 |
| Average temperature (°C) | 3.2 | 5.8 | 10.9 | 14.0 | 17.6 | 22.0 | 25.5 | 27.6 | 24.3 | 18.3 | 11.4 | 6.5 |
| Average night temperature (°C) | -0.4 | 2.2 | 7.0 | 10.8 | 15.1 | 19.6 | 23.4 | 25.3 | 22.1 | 15.2 | 7.7 | 3.2 |
| Absolute minimum temperature (°C) | -10.1 | -2.0 | 1.0 | 5.1 | 10.7 | 16.0 | 20.5 | 23.5 | 16.9 | 10.5 | -1.5 | -5.6 |
| 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 | 14.2 | 13.4 | 12.4 | 11.3 | 10.3 | 9.9 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 7.7 | 7.4 | 8.8 | 8.0 | 7.5 | 8.1 | 7.2 | 9.6 | 7.4 | 8.6 | 8.1 | 7.0 |
| Precipitation (mm) | 60 | 48 | 52 | 114 | 237 | 227 | 280 | 265 | 234 | 8 | 49 | 90 |
| Sunny days | 24 | 20 | 19 | 16 | 13 | 11 | 6 | 7 | 7 | 24 | 22 | 21 |
| Rainy days | 6 | 8 | 12 | 14 | 18 | 19 | 25 | 24 | 23 | 7 | 8 | 8 |
| Snow days | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
The largest precipitation sum in Isu is at