South Dewees Island Weather Forecast

    • 73
    • 86

    Chance Rain Showers

    • 72
    • 85

    Chance Thunderstorms

    • 68
    • 83

    Chance Thunderstorms

    • 65
    • 81

    Slight Chance Thunderstorms

    • 63
    • 79

    Mostly Sunny

    • 64
    • 78

    Partly Sunny

Today 21 Sep Charleston

Mostly sunny with a slight chance of Showers. A slight chance of Thunderstorms this afternoon. Highs in the upper 80s. Northeast Winds around 5 Mph, becoming east this afternoon. Chance of rain 20 percent.

Tonight 21 Sep Charleston

Mostly cloudy. A chance of Showers and Thunderstorms after midnight. Lows in the lower 70s. East Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Dewees Island Temperature Statistics

September Temperature

Mount Pleasant Regional-Faison Field (5 miles)

  • Lowest 17 September, 2026

    66.2 °F

  • Average September

    80.5 °F

  • Highest 5 September, 2026

    93.2 °F

Climate (2021–2026)

Mount Pleasant Regional-Faison Field (5 miles)

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  • Average Low 2021–2026

    58.4 °F

  • Average 2021–2026

    66.5 °F

  • Average High 2021–2026

    75.6 °F
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