Marathon Weather Forecast

    • 68
    • 79

    Mostly Sunny

    • 67
    • 79

    Mostly Sunny

    • 67
    • 77

    Mostly Sunny

    • 69
    • 79

    Mostly Sunny

    • 67
    • 79

    Mostly Sunny

    • 60
    • 75

    Partly Sunny

    • 63
    • 72

    Mostly Sunny

Today 25 Dec Monroe Middle Keys

Mostly sunny with a slight chance of Showers. Highs in the upper 70s. Northeast Winds 10 to 15 Mph, becoming north to northeast and decreasing to 5 to 10 Mph. Chance of rain 10 percent.

Tonight 25 Dec Monroe Middle Keys

Mostly clear with a slight chance of Showers. Lows in the upper 60s. North to northeast Winds 5 to 10 Mph. Chance of rain 10 percent.

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Marathon Temperature Statistics

December Temperature

The Florida Keys - Marathon International Airport (2.5 miles)

  • Lowest 11 December, 2025

    66.9 °F

  • Average December

    75.6 °F

  • Highest 1 December, 2025

    82 °F

Climate (2020–Present)

The Florida Keys - Marathon International Airport (2.5 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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