Big Spanish Channel - Porpoise Key Weather Forecast

    • 80
    • 88

    Rain Showers

    • 80
    • 88

    Rain Showers

    • 80
    • 89

    Thunderstorms

    • 80
    • 89

    Thunderstorms

    • 79
    • 89

    Thunderstorms

    • 78
    • 88

    Thunderstorms

Today 7 Sep Monroe Lower Keys

Partly sunny with a chance of Showers and Thunderstorms. Highs in the upper 80s. South Winds near 5 Mph. Chance of rain 50 percent.

Tonight 7 Sep Monroe Lower Keys

Mostly cloudy with a chance of Showers and Thunderstorms. Lows near 80. Southwest Winds near 5 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Spanish Channel - Porpoise Key Temperature Statistics

September Temperature

The Florida Keys - Marathon International Airport (18.6 miles)

  • Lowest 4 September, 2025

    75 °F

  • Average September

    82.1 °F

  • Highest 1 September, 2025

    88 °F

Climate (2020–Present)

The Florida Keys - Marathon International Airport (18.6 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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