Sullivan's Island Weather Forecast

    • 55
    • 68

    Becoming Sunny

    • 56
    • 65

    Partly Sunny

    • 56
    • 69

    Partly Sunny

    • 57
    • 66

    Mostly Cloudy

    • 40
    • 68

    Mostly Cloudy

    • 35
    • 49

    Mostly Sunny

Today 25 Dec Charleston

Mostly sunny. Highs in the lower 70s, except in the upper 60s near the coast. Southwest Winds 5 to 10 Mph.

Tonight 25 Dec Charleston

Partly cloudy. Patchy fog. Lows in the lower 50s. Light and variable Winds.

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Sullivan's Island Temperature Statistics

December Temperature

Mount Pleasant Regional-Faison Field (9.3 miles)

  • Lowest 15 December, 2025

    21.2 °F

  • Average December

    48.7 °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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