Cape Sable Weather Forecast

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    • 90

    Rain Showers

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    • 89

    Rain Showers

    • 81
    • 90

    Rain Showers

    • 82
    • 89

    Rain Showers

    • 82
    • 89

    Rain Showers

    • 81
    • 89

    Rain Showers

Today 20 Aug Mainland Monroe

Sunny. A slight chance of Showers and Thunderstorms late this Morning, then a chance of Showers and Thunderstorms this afternoon. Highs in the lower 90s. Northwest Winds 10 to 15 Mph. Chance of rain 50 percent.

Tonight 20 Aug Mainland Monroe

Mostly clear with a slight chance of Showers and Thunderstorms. Lows in the upper 70s. West Winds 10 to 15 Mph, Diminishing to around 5 Mph after midnight. Chance of rain 20 percent.

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Cape Sable Temperature Statistics

August Temperature

The Florida Keys - Marathon International Airport (26.7 miles)

  • Lowest 7 August, 2025

    75.7 °F

  • Average August

    86.1 °F

  • Highest 6 August, 2025

    92.6 °F

Climate (2020–Present)

The Florida Keys - Marathon International Airport (26.7 miles)

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  • Average Low 2020–2025

    75.4 °F

  • Average 2020–2025

    80 °F

  • Average High 2020–2025

    85.1 °F
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