Charleston boasts a year-around average temperature of 19.3°C, peaking at 27.9°C in July, its warmest month, and dipping to an average low of 9.9°C in January, the coolest. Rainfall averages at 94.0mm annually, with August seeing the heaviest showers and May being the driest month.
Month![]() | Temperature (Celcius)![]() | Rainfall (mm)![]() |
January | 9.9 | 74.7 |
February | 11.4 | 63.8 |
March | 14.6 | 83.8 |
April | 18.6 | 64.3 |
May | 22.7 | 54.9 |
June | 26.3 | 118.1 |
July | 27.9 | 137.2 |
August | 27.4 | 170.4 |
September | 24.9 | 146.3 |
October | 20.3 | 93.2 |
November | 15.8 | 55.6 |
December | 11.4 | 66.0 |