Shell Key - Northwest Side Weather Forecast

    • 71
    • 78

    Rain Showers

    • 67
    • 77

    Rain Showers

    • 69
    • 75

    Breezy

    • 70
    • 75

    Breezy

    • 73
    • 77

    Partly Sunny

    • 73
    • 79

    Mostly Cloudy

    • 73
    • 79

    Partly Sunny

Today 13 Dec Monroe Upper Keys

Increasing cloudiness with a chance of Showers and a slight chance of Thunderstorms. Highs in the upper 70s. East Winds 10 to 15 Mph. Chance of rain 40 percent.

Tonight 13 Dec Monroe Upper Keys

Showers with a chance of Thunderstorms. Lows in the lower 70s. East Winds 10 to 15 Mph, becoming northeast to east after midnight. Chance of rain 80 percent.

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Shell Key - Northwest Side Temperature Statistics

December Temperature

The Florida Keys - Marathon International Airport (26.7 miles)

  • Lowest 11 December, 2025

    66.9 °F

  • Average December

    77.1 °F

  • Highest 1 December, 2025

    82 °F

Climate (2020–Present)

The Florida Keys - Marathon International Airport (26.7 miles)

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  • Average Low 2020–2025

    75.3 °F

  • Average 2020–2025

    80 °F

  • Average High 2020–2025

    85.1 °F
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