Charleston Harbor - Fort Sumter Weather Forecast

    • 78
    • 84

    Chance Rain Showers

    • 78
    • 86

    Chance Thunderstorms

    • 78
    • 85

    Rain Showers Likely

    • 77
    • 85

    Chance Thunderstorms

    • 77
    • 86

    Chance Thunderstorms

    • 77
    • 84

    Chance Thunderstorms

Today 10 Sep Charleston

Mostly sunny with a chance of Showers. A slight chance of Thunderstorms late this Morning, then a chance of Thunderstorms this afternoon. Highs in the upper 80s. South Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 10 Sep Charleston

Partly cloudy. Lows in the mid 70s. South Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Charleston Harbor - Fort Sumter Temperature Statistics

September Temperature

Charleston Executive Airport (8.1 miles)

  • Lowest 8 September, 2026

    73.4 °F

  • Average September

    82.1 °F

  • Highest 2 September, 2026

    91.4 °F

Climate (2021–2026)

Charleston Executive Airport (8.1 miles)

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  • Average Low 2021–2026

    59 °F

  • Average 2021–2026

    67.3 °F

  • Average High 2021–2026

    76.3 °F
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