Shell Key Channel Weather Forecast

    • 78
    • 84

    Rain Showers Likely

    • 80
    • 86

    Chance Thunderstorms

    • 81
    • 86

    Chance Thunderstorms

    • 80
    • 87

    Chance Thunderstorms

    • 80
    • 86

    Chance Thunderstorms

    • 80
    • 86

    Chance Thunderstorms

Today 13 Sep Monroe Upper Keys

Showers likely with a chance of Thunderstorms. Highs in the upper 80s. North to northeast Winds 5 to 10 Mph. Chance of rain 60 percent.

Tonight 13 Sep Monroe Upper Keys

Partly to mostly cloudy with a chance of Showers and Thunderstorms. Lows in the upper 70s. North to northeast Winds near 5 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Shell Key Channel Temperature Statistics

September Temperature

The Florida Keys - Marathon International Airport (27.3 miles)

  • Lowest 4 September, 2025

    75 °F

  • Average September

    83.5 °F

  • Highest 11 September, 2025

    89.1 °F

Climate (2020–Present)

The Florida Keys - Marathon International Airport (27.3 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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