Big Spanish Channel - Mayo Key Weather Forecast

    • 79
    • 91

    Rain Showers

    • 80
    • 91

    Rain Showers

    • 79
    • 91

    Rain Showers

    • 80
    • 91

    Chance Thunderstorms

    • 80
    • 91

    Chance Thunderstorms

    • 80
    • 91

    Chance Thunderstorms

Today 3 Sep Monroe Lower Keys

Showers with a chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall. Highs in the upper 80s. West Winds near 10 Mph. Chance of rain 80 percent.

Tonight 3 Sep Monroe Lower Keys

Showers with a chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall. Lows near 80. Southwest to west Winds near 10 Mph. Chance of rain 80 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Spanish Channel - Mayo Key Temperature Statistics

September Temperature

The Florida Keys - Marathon International Airport (19.3 miles)

  • Lowest 1 September, 2025

    79 °F

  • Average September

    83.3 °F

  • Highest 1 September, 2025

    88 °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

    85.2 °F
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