Charleston Harbor - Fort Sumter Weather Forecast

    • 40
    • 47

    Decreasing Clouds

    • 46
    • 59

    Mostly Sunny

    • 43
    • 55

    Mostly Sunny

    • 49
    • 57

    Mostly Sunny

    • 51
    • 61

    Mostly Sunny

    • 38
    • 61

    Partly Sunny

Today 9 Dec Charleston

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

Tonight 9 Dec Charleston

Mostly cloudy. Lows in the lower 30s. North Winds 5 to 10 Mph with Gusts up to 20 Mph.

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Charleston Harbor - Fort Sumter Temperature Statistics

December Temperature

Charleston Executive Airport (8.1 miles)

  • Lowest 4 December, 2025

    37.4 °F

  • Average December

    51.5 °F

  • Highest 2 December, 2025

    59 °F

Climate (2020–Present)

Charleston Executive Airport (8.1 miles)

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  • Average Low 2020–2025

    58.9 °F

  • Average 2020–2025

    67.2 °F

  • Average High 2020–2025

    76 °F
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