Average annual temperature is 19.5 °C
Absolute maximum temperature: 41.3 °C
Absolute minimum temperature: -5.1 °C
Number of sunny days: 299 days
Number of rainy days: 66 days
Look at detailed online map of Charleston (historical)
* Weather data for Charleston (historical) United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 22.5 | 24.7 | 25.8 | 33.9 | 33.1 | 40.0 | 41.3 | 40.1 | 39.1 | 33.3 | 31.4 | 23.9 |
| Average daytime temperature (°C) | 15.7 | 17.1 | 20.8 | 27.7 | 30.3 | 34.7 | 38.7 | 35.7 | 34.8 | 29.3 | 22.4 | 18.0 |
| Average temperature (°C) | 7.9 | 8.9 | 12.8 | 19.2 | 22.5 | 26.9 | 31.5 | 28.7 | 27.0 | 21.8 | 15.1 | 10.4 |
| Average night temperature (°C) | 1.8 | 2.7 | 5.6 | 10.1 | 13.7 | 17.8 | 23.6 | 21.9 | 19.6 | 14.5 | 8.4 | 4.1 |
| Absolute minimum temperature (°C) | -5.1 | -2.8 | -2.2 | 1.2 | 8.7 | 11.3 | 20.7 | 17.8 | 16.6 | 4.0 | 1.9 | -0.8 |
| 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 | 10.0 |
| Daylight mean duration (h) | 10.4 | 11.1 | 12.0 | 13.0 | 13.8 | 14.2 | 14.0 | 13.3 | 12.4 | 11.4 | 10.6 | 10.1 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 8.3 | 8.6 | 10.1 | 12.1 | 12.3 | 12.6 | 12.5 | 11.4 | 11.1 | 10.2 | 9.4 | 8.3 |
| Precipitation (mm) | 27 | 19 | 27 | 0 | 10 | 0 | 4 | 23 | 11 | 0 | 2 | 18 |
| Sunny days | 24 | 16 | 26 | 30 | 26 | 30 | 23 | 15 | 25 | 29 | 28 | 27 |
| Rainy days | 7 | 12 | 5 | 0 | 5 | 0 | 8 | 16 | 5 | 2 | 2 | 4 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Charleston (historical) is at