Sullivan's Island Weather Forecast

    • 39
    • 48

    Mostly Sunny

    • 44
    • 59

    Mostly Sunny

    • 42
    • 55

    Mostly Sunny

    • 48
    • 58

    Mostly Sunny

    • 50
    • 62

    Mostly Sunny

    • 36
    • 62

    Partly Sunny

Today 9 Dec Charleston

Mostly sunny. Highs in the upper 40s. North Winds 5 to 10 Mph.

Tonight 9 Dec Charleston

Mostly clear. Lows in the lower 30s, except in the mid 30s near the coast. Northwest Winds around 5 Mph.

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Sullivan's Island Temperature Statistics

December Temperature

Mount Pleasant Regional-Faison Field (9.3 miles)

  • Lowest 4 December, 2025

    35.6 °F

  • Average December

    50 °F

  • Highest 1 December, 2025

    57.2 °F

Climate (2020–Present)

Mount Pleasant Regional-Faison Field (9.3 miles)

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  • Average Low 2020–2025

    58.3 °F

  • Average 2020–2025

    66.3 °F

  • Average High 2020–2025

    75.3 °F
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