Sullivan's Island Weather Forecast

    • 49
    • 58

    Mostly Sunny

    • 53
    • 63

    Mostly Sunny

    • 24
    • 61

    Slight Chance Rain Showers

    • 32
    • 41

    Mostly Sunny

    • 42
    • 52

    Mostly Sunny

    • 51
    • 58

    Mostly Cloudy

Today 12 Dec Charleston

Sunny. Highs in the upper 50s. Southwest Winds 5 to 10 Mph.

Tonight 12 Dec Charleston

Mostly clear. Lows in the mid 40s. Southwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sullivan's Island Temperature Statistics

December Temperature

Mount Pleasant Regional-Faison Field (9.3 miles)

  • Lowest 9 December, 2025

    30.2 °F

  • Average December

    47.8 °F

  • Highest 10 December, 2025

    59 °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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