Sullivan's Island Weather Forecast

    • 77
    • 84

    Chance Thunderstorms

    • 77
    • 86

    Chance Thunderstorms

    • 77
    • 87

    Rain Showers Likely

    • 77
    • 85

    Chance Thunderstorms

    • 77
    • 86

    Chance Thunderstorms

    • 77
    • 86

    Chance Thunderstorms

Today 9 Sep Charleston

Mostly sunny with a slight chance of Thunderstorms. A chance of Showers, mainly this morning. Highs in the mid 80s. East Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 50 percent.

Tonight 9 Sep Charleston

Partly cloudy. A slight chance of Showers and Thunderstorms after midnight. Lows in the mid 70s. East Winds 10 to 15 Mph, becoming southeast around 5 Mph after midnight. Chance of rain 20 percent.

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Sullivan's Island Temperature Statistics

September Temperature

Mount Pleasant Regional-Faison Field (9.3 miles)

  • Lowest 6 September, 2026

    73.4 °F

  • Average September

    81.8 °F

  • Highest 5 September, 2026

    93.2 °F

Climate (2021–2026)

Mount Pleasant Regional-Faison Field (9.3 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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