Key Colony Beach Weather Forecast

    • 72
    • 79

    Increasing Clouds

    • 72
    • 78

    Partly Sunny

    • 71
    • 79

    Mostly Sunny

    • 70
    • 78

    Mostly Sunny

    • 70
    • 78

    Partly Sunny

    • 70
    • 78

    Mostly Sunny

Today 21 Dec Monroe Middle Keys

Mostly sunny. Highs near 80. Northeast to east Winds 10 to 15 Mph.

Tonight 21 Dec Monroe Middle Keys

Partly cloudy. Becoming breezy. Lows in the lower 70s. Northeast to east Winds 10 to 15 Mph, increasing to 15 to 20 Mph.

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Key Colony Beach Temperature Statistics

December Temperature

The Florida Keys - Marathon International Airport (1.9 miles)

  • Lowest 11 December, 2025

    66.9 °F

  • Average December

    75.7 °F

  • Highest 1 December, 2025

    82 °F

Climate (2020–Present)

The Florida Keys - Marathon International Airport (1.9 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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