Charleston (SC) monthly weather averages

  • Average daytime temperature

    The bar chart below shows the average monthly peak daytime temperatures at Charleston

    Charleston average temperature chart
    Average monthly temperatures in Charleston (degrees centigrade and fahrenheit)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    °C 13.3 15 18.7 22.8 26.6 29.5 31.2 30.6 28.3 23.9 19.6 15.4
    °F 56 59 65.6 73.1 79.8 85.1 88.1 87.1 82.9 75 67.3 59.7

    Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

  • Average rainfall & rainy days

    The graph below shows the average rainfall and number of rainy days per month.

    Average monthly rainfall in Charleston (mm and inches)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    mm 86 81 109 64 95 153 162 185 121 73 60 76
    inches 3.4 3.2 4.3 2.5 3.7 6 6.4 7.3 4.8 2.9 2.4 3
    Rainy days 10 9 9 7 9 11 13 13 10 6 7 8
  • Average daily sunshine

    The bar chart below shows the average daily sunshine hours in Charleston

    Average daily sunshine Charleston
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    Hrs sunshine 6.4 7.2 8.4 9.8 10.1 9.9 9.8 8.8 7.8 7.8 6.9 6.1
  • Day / night temperatures

    The graph below shows the daily range of temperatures for each month.

    Maximum and minimum daily temperatures in Charleston (degrees centigrade and fahrenheit)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    Min °C 4.7 6 9.9 14 18.7 22.1 23.9 23.6 21.4 15.5 10.8 6.6
    Max °C 13.6 15.2 18.9 23.1 26.8 29.7 31.4 30.8 28.5 24.1 19.9 15.6
    Min °F 40.4 42.8 49.8 57.1 65.6 71.8 74.9 74.5 70.4 59.9 51.4 43.9
    Max °F 48.4 51.1 57.9 65.3 72.9 78.6 81.7 81 76.8 67.6 59.5 52
  • Sea temperature

    The graph below shows the average sea temperature.

    Average sea temperature around Charleston in degrees centigrade and fahrenheit
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    °C 20.8 20.3 20.1 20.8 23.4 26.4 28.1 28.4 27.7 25.4 23 21.8
    °F 69.4 68.5 68.2 69.5 74.1 79.5 82.6 83.2 81.9 77.8 73.5 71.2
  • Wind speed

    The graph below shows the average wind speed.

    Average wind speed in Charleston (mph and kmh)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    km/h 15 17 17 16 14 14 13 12 13 14 14 14
    mph 9 10 10 10 9 9 8 8 8 9 9 9

    A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

  • Relative humidity

    The graph below shows the average relative humidity.

    Average relative humidity in Charleston
    Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    70% 67% 68% 68% 73% 75% 77% 79% 78% 74% 73% 72%

Other monthly averages

Charleston weather stats

Charleston weather statistics
Hottest month: July 31.2°C 88.2°F
Driest month: November 60mm 2.4ins
Sunniest month: April 9.8hrs
Coldest month: January 13.3°C 55.9°F
Wettest month: August 185mm 7.3ins
Warmest sea: August 28.4°C 83.1°F
Map showing location of Charleston (32.77657, -79.93092)

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