Annual Weather Averages in Charleston
Based on weather reports collected during 1992–2021.
All Year Climate & Weather Averages in Charleston
High Temp: 86 °F
Low Temp: 26 °F
Mean Temp: 56 °F
Precipitation: 3.88"
Humidity: 69%
Dew Point: 45 °F
Wind: 6 mph
Pressure: 30.06 "Hg
Visibility: 8 mi
January Climate & Weather Averages in Charleston
High Temp: 44 °F
Low Temp: 26 °F
Mean Temp: 35 °F
Precipitation: 3.32"
Humidity: 70%
Dew Point: 26 °F
Wind: 8 mph
Pressure: 30.13 "Hg
Visibility: 8 mi
February Climate & Weather Averages in Charleston
High Temp: 47 °F
Low Temp: 29 °F
Mean Temp: 38 °F
Precipitation: 3.64"
Humidity: 67%
Dew Point: 27 °F
Wind: 8 mph
Pressure: 30.10 "Hg
Visibility: 8 mi
March Climate & Weather Averages in Charleston
High Temp: 57 °F
Low Temp: 35 °F
Mean Temp: 46 °F
Precipitation: 4.09"
Humidity: 62%
Dew Point: 33 °F
Wind: 8 mph
Pressure: 30.08 "Hg
Visibility: 9 mi
April Climate & Weather Averages in Charleston
High Temp: 69 °F
Low Temp: 44 °F
Mean Temp: 57 °F
Precipitation: 3.54"
Humidity: 58%
Dew Point: 41 °F
Wind: 8 mph
Pressure: 29.99 "Hg
Visibility: 9 mi
May Climate & Weather Averages in Charleston
High Temp: 76 °F
Low Temp: 53 °F
Mean Temp: 65 °F
Precipitation: 5.00"
Humidity: 69%
Dew Point: 54 °F
Wind: 5 mph
Pressure: 30.00 "Hg
Visibility: 8 mi
June Climate & Weather Averages in Charleston
High Temp: 83 °F
Low Temp: 62 °F
Mean Temp: 72 °F
Precipitation: 4.77"
Humidity: 72%
Dew Point: 62 °F
Wind: 5 mph
Pressure: 29.98 "Hg
Visibility: 8 mi
July Climate & Weather Averages in Charleston
High Temp: 86 °F
Low Temp: 66 °F
Mean Temp: 76 °F
Precipitation: 5.39"
Humidity: 74%
Dew Point: 66 °F
Wind: 4 mph
Pressure: 30.00 "Hg
Visibility: 7 mi
August Climate & Weather Averages in Charleston
High Temp: 85 °F
Low Temp: 64 °F
Mean Temp: 75 °F
Precipitation: 3.87"
Humidity: 75%
Dew Point: 65 °F
Wind: 3 mph
Pressure: 30.03 "Hg
Visibility: 7 mi
September Climate & Weather Averages in Charleston
High Temp: 79 °F
Low Temp: 57 °F
Mean Temp: 68 °F
Precipitation: 3.36"
Humidity: 73%
Dew Point: 59 °F
Wind: 3 mph
Pressure: 30.06 "Hg
Visibility: 7 mi
October Climate & Weather Averages in Charleston
High Temp: 69 °F
Low Temp: 45 °F
Mean Temp: 57 °F
Precipitation: 3.02"
Humidity: 72%
Dew Point: 47 °F
Wind: 4 mph
Pressure: 30.08 "Hg
Visibility: 8 mi
November Climate & Weather Averages in Charleston
High Temp: 57 °F
Low Temp: 35 °F
Mean Temp: 46 °F
Precipitation: 3.11"
Humidity: 67%
Dew Point: 35 °F
Wind: 6 mph
Pressure: 30.14 "Hg
Visibility: 9 mi
December Climate & Weather Averages in Charleston
High Temp: 47 °F
Low Temp: 30 °F
Mean Temp: 39 °F
Precipitation: 3.51"
Humidity: 72%
Dew Point: 30 °F
Wind: 7 mph
Pressure: 30.14 "Hg
Visibility: 9 mi