Sullivan's Island Weather Forecast

    • 78
    • 91

    Rain Showers Likely

    • 78
    • 89

    Rain Showers Likely

    • 77
    • 90

    Slight Chance Thunderstorms

    • 77
    • 89

    Slight Chance Thunderstorms

    • 77
    • 88

    Chance Thunderstorms

    • 77
    • 88

    Chance Thunderstorms

Today 21 Aug Charleston

Sunny with a slight chance of Showers and Thunderstorms. Highs in the lower 90s. Heat index Values up to 108. South Winds 10 to 15 Mph. Chance of rain 20 percent.

Tonight 21 Aug Charleston

Partly cloudy in the Evening, then becoming mostly cloudy. A chance of Showers and Thunderstorms. Lows in the mid 70s. South Winds 10 to 15 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sullivan's Island Temperature Statistics

August Temperature

Mount Pleasant Regional-Faison Field (9.3 miles)

  • Lowest 5 August, 2026

    73.4 °F

  • Average August

    82.8 °F

  • Highest 17 August, 2026

    98.6 °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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