Shell Key - Northwest Side Weather Forecast

    • 83
    • 88

    Chance Thunderstorms

    • 83
    • 88

    Chance Thunderstorms

    • 83
    • 89

    Chance Thunderstorms

    • 84
    • 89

    Chance Thunderstorms

    • 83
    • 89

    Chance Thunderstorms

    • 83
    • 88

    Chance Thunderstorms

Today 6 Sep Monroe Upper Keys

Partly cloudy with a chance of Showers and Thunderstorms. Highs near 90. Southeast to south near 5 Mph, becoming variable. Chance of rain 40 percent.

Tonight 6 Sep Monroe Upper Keys

Partly cloudy with a chance of Showers and Thunderstorms. Lows in the lower 80s. Southeast to south Winds 5 to 10 Mph. Chance of rain 30 percent.

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Shell Key - Northwest Side Temperature Statistics

September Temperature

The Florida Keys - Marathon International Airport (26.7 miles)

  • Lowest 1 September, 2026

    82.7 °F

  • Average September

    87.1 °F

  • Highest 1 September, 2026

    92.6 °F

Climate (2021–2026)

The Florida Keys - Marathon International Airport (26.7 miles)

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  • Average Low 2021–2026

    75.5 °F

  • Average 2021–2026

    80.1 °F

  • Average High 2021–2026

    85.1 °F
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