Shell Key - Northwest Side Weather Forecast

    • 80
    • 86

    Isolated Thunderstorms

    • 81
    • 86

    Thunderstorms

    • 79
    • 87

    Rain Showers

    • 78
    • 85

    Rain Showers

    • 79
    • 85

    Rain Showers

    • 79
    • 86

    Thunderstorms

Today 14 Sep Monroe Upper Keys

Mostly sunny with a slight chance of Showers and Thunderstorms. Highs near 90. Variable Winds near 5 Mph. Chance of rain 20 percent.

Tonight 14 Sep Monroe Upper Keys

Partly cloudy with a slight chance of Showers and Thunderstorms. Lows near 80. Variable Winds near 5 Mph, becoming northeast to east. Chance of rain 20 percent.

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Shell Key - Northwest Side Temperature Statistics

September Temperature

The Florida Keys - Marathon International Airport (26.7 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 (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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