Marathon Weather Forecast

    • 68
    • 76

    Mostly Sunny

    • 72
    • 81

    Mostly Sunny

    • 74
    • 83

    Mostly Sunny

    • 76
    • 85

    Mostly Sunny

    • 72
    • 85

    Partly Sunny

    • 67
    • 80

    Slight Chance Rain Showers

Today 12 Mar Monroe Middle Keys

Mostly sunny. Highs in the mid 70s. North to northeast Winds 5 to 10 Mph, becoming east to southeast.

Tonight 12 Mar Monroe Middle Keys

Mostly clear. Lows near 70. East to southeast Winds near 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Marathon Temperature Statistics

March Temperature

The Florida Keys - Marathon International Airport (2.5 miles)

  • Lowest 7 March, 2025

    59.6 °F

  • Average March

    74 °F

  • Highest 5 March, 2025

    82.7 °F

Climate (2020–Present)

The Florida Keys - Marathon International Airport (2.5 miles)

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  • Average Low 2020–2025

    75.3 °F

  • Average 2020–2025

    80 °F

  • Average High 2020–2025

    85.3 °F
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