Annual Weather Averages in Charleston
Based on weather reports collected during 1985–2015.
All Year Climate & Weather Averages in Charleston
High Temp: 86 °F
Low Temp: 26 °F
Mean Temp: 56 °F
Precipitation: 2.22"
Humidity: 69%
Dew Point: 45 °F
Wind: 3 mph
Pressure: 30.07 "Hg
Visibility: 8 mi
January Climate & Weather Averages in Charleston
High Temp: 44 °F
Low Temp: 26 °F
Mean Temp: 35 °F
Precipitation: 1.98"
Humidity: 70%
Dew Point: 26 °F
Wind: 5 mph
Pressure: 30.13 "Hg
Visibility: 8 mi
February Climate & Weather Averages in Charleston
High Temp: 47 °F
Low Temp: 28 °F
Mean Temp: 37 °F
Precipitation: 1.97"
Humidity: 67%
Dew Point: 26 °F
Wind: 5 mph
Pressure: 30.11 "Hg
Visibility: 9 mi
March Climate & Weather Averages in Charleston
High Temp: 57 °F
Low Temp: 35 °F
Mean Temp: 46 °F
Precipitation: 2.53"
Humidity: 62%
Dew Point: 33 °F
Wind: 4 mph
Pressure: 30.07 "Hg
Visibility: 9 mi
April Climate & Weather Averages in Charleston
High Temp: 69 °F
Low Temp: 44 °F
Mean Temp: 56 °F
Precipitation: 2.18"
Humidity: 58%
Dew Point: 41 °F
Wind: 4 mph
Pressure: 29.99 "Hg
Visibility: 10 mi
May Climate & Weather Averages in Charleston
High Temp: 76 °F
Low Temp: 53 °F
Mean Temp: 64 °F
Precipitation: 2.90"
Humidity: 70%
Dew Point: 54 °F
Wind: 3 mph
Pressure: 30.01 "Hg
Visibility: 8 mi
June Climate & Weather Averages in Charleston
High Temp: 83 °F
Low Temp: 62 °F
Mean Temp: 72 °F
Precipitation: 2.70"
Humidity: 73%
Dew Point: 62 °F
Wind: 3 mph
Pressure: 29.99 "Hg
Visibility: 8 mi
July Climate & Weather Averages in Charleston
High Temp: 86 °F
Low Temp: 66 °F
Mean Temp: 76 °F
Precipitation: 3.37"
Humidity: 74%
Dew Point: 66 °F
Wind: 2 mph
Pressure: 30.01 "Hg
Visibility: 7 mi
August Climate & Weather Averages in Charleston
High Temp: 85 °F
Low Temp: 64 °F
Mean Temp: 74 °F
Precipitation: 2.00"
Humidity: 75%
Dew Point: 65 °F
Wind: 2 mph
Pressure: 30.03 "Hg
Visibility: 6 mi
September Climate & Weather Averages in Charleston
High Temp: 78 °F
Low Temp: 57 °F
Mean Temp: 68 °F
Precipitation: 1.69"
Humidity: 75%
Dew Point: 59 °F
Wind: 2 mph
Pressure: 30.06 "Hg
Visibility: 7 mi
October Climate & Weather Averages in Charleston
High Temp: 68 °F
Low Temp: 44 °F
Mean Temp: 56 °F
Precipitation: 1.47"
Humidity: 72%
Dew Point: 46 °F
Wind: 3 mph
Pressure: 30.09 "Hg
Visibility: 8 mi
November Climate & Weather Averages in Charleston
High Temp: 57 °F
Low Temp: 36 °F
Mean Temp: 47 °F
Precipitation: 1.80"
Humidity: 67%
Dew Point: 35 °F
Wind: 4 mph
Pressure: 30.14 "Hg
Visibility: 9 mi
December Climate & Weather Averages in Charleston
High Temp: 47 °F
Low Temp: 29 °F
Mean Temp: 38 °F
Precipitation: 2.06"
Humidity: 72%
Dew Point: 29 °F
Wind: 4 mph
Pressure: 30.15 "Hg
Visibility: 8 mi