Big Spanish Channel - Mayo Key Weather Forecast

    • 77
    • 89

    Rain Showers

    • 78
    • 90

    Rain Showers Likely

    • 78
    • 89

    Chance Rain Showers

    • 79
    • 90

    Chance Rain Showers

    • 79
    • 90

    Chance Rain Showers

    • 80
    • 91

    Chance Rain Showers

Today 18 Sep Monroe Lower Keys

Showers likely with a slight chance of Thunderstorms. Highs in the upper 80s. East Winds near 10 Mph. Chance of rain 70 percent.

Tonight 18 Sep Monroe Lower Keys

Showers likely with a slight chance of Thunderstorms. Lows in the upper 70s. Northeast Winds near 10 Mph, decreasing to 5 to 10 Mph. Chance of rain 60 percent.

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Big Spanish Channel - Mayo Key Temperature Statistics

September Temperature

The Florida Keys - Marathon International Airport (19.3 miles)

  • Lowest 13 September, 2025

    73.9 °F

  • Average September

    83.3 °F

  • Highest 11 September, 2025

    89.1 °F

Climate (2020–Present)

The Florida Keys - Marathon International Airport (19.3 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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