Sullivan's Island Weather Forecast

    • 70
    • 78

    Mostly Cloudy

    • 62
    • 75

    Chance Thunderstorms

    • 61
    • 75

    Sunny

    • 63
    • 78

    Mostly Sunny

    • 66
    • 80

    Partly Sunny

    • 69
    • 81

    Mostly Sunny

    • 71
    • 82

    Mostly Sunny

Today 23 Sep Charleston

Mostly sunny with a 20 percent chance of Showers. Highs in the mid 80s.

Tonight 23 Sep Charleston

Mostly cloudy. Lows in the upper 60s. North Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sullivan's Island Temperature Statistics

September Temperature

Mount Pleasant Regional-Faison Field (9.3 miles)

  • Lowest 17 September, 2026

    66.2 °F

  • Average September

    80.3 °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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