Sullivan's Island Weather Forecast

    • 44
    • 53

    Increasing Clouds

    • 53
    • 60

    Mostly Cloudy

    • 55
    • 64

    Rain Showers Likely

    • 42
    • 62

    Mostly Sunny

    • 47
    • 59

    Mostly Sunny

    • 46
    • 62

    Mostly Sunny

    • 47
    • 58

    Partly Sunny

Today 16 Dec Charleston

Sunny. Highs in the mid 50s. Southwest Winds around 5 Mph.

Tonight 16 Dec Charleston

Mostly clear. Lows in the mid 30s, except around 40 near the coast. Southwest Winds around 5 Mph, becoming northwest after midnight.

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Sullivan's Island Temperature Statistics

December Temperature

Mount Pleasant Regional-Faison Field (9.3 miles)

  • Lowest 9 December, 2025

    30.2 °F

  • Average December

    48.8 °F

  • Highest 13 December, 2025

    69.8 °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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