Cape Island Weather Forecast

    • 80
    • 88

    Slight Chance Thunderstorms

    • 80
    • 90

    Mostly Sunny

    • 79
    • 91

    Chance Thunderstorms

    • 77
    • 89

    Rain Showers Likely

    • 77
    • 85

    Thunderstorms Likely

    • 76
    • 85

    Chance Thunderstorms

Today 18 Jul Charleston

Mostly sunny. A slight chance of Showers and Thunderstorms in the afternoon. Highs in the lower 90s. Heat index Values up to 107. Southwest Winds 10 to 15 Mph. Chance of rain 20 percent.

Tonight 18 Jul Charleston

Mostly clear. Lows in the upper 70s. Southwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cape Island Temperature Statistics

July Temperature

Georgetown County Airport (18 miles)

  • Lowest 5 July, 2025

    69.8 °F

  • Average July

    78.6 °F

  • Highest 7 July, 2025

    91.4 °F

Climate (2020–Present)

Georgetown County Airport (18 miles)

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  • Average Low 2020–2025

    54.7 °F

  • Average 2020–2025

    64 °F

  • Average High 2020–2025

    74.3 °F
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