Marathon Weather Forecast

    • 71
    • 79

    Partly Sunny

    • 71
    • 80

    Mostly Sunny

    • 72
    • 80

    Mostly Sunny

    • 71
    • 80

    Partly Sunny

    • 63
    • 76

    Partly Sunny

    • 64
    • 74

    Mostly Cloudy

Today 7 Jan Monroe Middle Keys

Mostly sunny. Highs near 80. Variable Winds near 5 Mph, becoming northeast to east 5 to 10 Mph.

Tonight 7 Jan Monroe Middle Keys

Partly cloudy. Lows in the upper 60s. Northeast Winds 5 to 10 Mph.

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Marathon Temperature Statistics

January Temperature

The Florida Keys - Marathon International Airport (2.5 miles)

  • Lowest 1 January, 2026

    55.9 °F

  • Average January

    67.3 °F

  • Highest 5 January, 2026

    78.1 °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 °F

  • Average High 2021–2026

    85.1 °F
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