Marathon Weather Forecast

    • 55
    • 63

    Decreasing Clouds

    • 63
    • 71

    Chance Rain Showers

    • 63
    • 70

    Chance Rain Showers

    • 48
    • 70

    Chance Rain Showers

    • 48
    • 57

    Mostly Sunny

    • 51
    • 59

    Mostly Sunny

    • 59
    • 66

    Mostly Sunny

Today 28 Jan Monroe Middle Keys

Mostly cloudy with a slight chance of Showers. Breezy. Highs in the mid 60s. North Winds 15 to 20 Mph. Chance of rain 10 percent.

Tonight 28 Jan Monroe Middle Keys

Mostly cloudy with a slight chance of Showers. Breezy with Lows in the mid 50s. North Winds 15 to 20 Mph. Chance of rain 10 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Marathon Temperature Statistics

January Temperature

The Florida Keys - Marathon International Airport (2.5 miles)

  • Lowest 16 January, 2026

    51.7 °F

  • Average January

    71.4 °F

  • Highest 26 January, 2026

    82 °F

Climate (2021–Present)

The Florida Keys - Marathon International Airport (2.5 miles)

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  • Average Low 2021–2026

    75.4 °F

  • Average 2021–2026

    80.1 °F

  • Average High 2021–2026

    85.2 °F
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