Sullivan's Island Weather Forecast

    • 80
    • 92

    Slight Chance Thunderstorms

    • 82
    • 92

    Slight Chance Thunderstorms

    • 82
    • 92

    Partly Sunny

    • 81
    • 92

    Chance Thunderstorms

    • 81
    • 89

    Slight Chance Thunderstorms

    • 81
    • 92

    Mostly Sunny

Today 12 Aug Charleston

Sunny. A slight chance of Showers and Thunderstorms this afternoon. Highs in the mid 90s. Heat index Values up to 111 this afternoon. West Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 12 Aug Charleston

Partly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then mostly clear after midnight. Lows in the upper 70s. Heat index Values up to 107 early in the evening. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent.

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Sullivan's Island Temperature Statistics

August Temperature

Mount Pleasant Regional-Faison Field (9.3 miles)

  • Lowest 5 August, 2026

    73.4 °F

  • Average August

    80.9 °F

  • Highest 10 August, 2026

    93.2 °F

Climate (2021–2026)

Mount Pleasant Regional-Faison Field (9.3 miles)

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  • Average Low 2021–2026

    58.3 °F

  • Average 2021–2026

    66.5 °F

  • Average High 2021–2026

    75.5 °F
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