Marathon Weather Forecast

    • 76
    • 86

    Mostly Sunny

    • 75
    • 84

    Mostly Sunny

    • 74
    • 83

    Chance Rain Showers

    • 75
    • 83

    Rain Showers Likely

    • 75
    • 83

    Rain Showers Likely

    • 76
    • 83

    Rain Showers Likely

Today 20 Oct Monroe Middle Keys

Mostly sunny with a slight chance of Showers. Breezy. Highs in the mid 80s. Northeast Winds 15 to 20 Mph. Chance of rain 10 percent.

Tonight 20 Oct Monroe Middle Keys

Mostly clear. Breezy. Lows in the mid 70s. Northeast Winds 15 to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Marathon Temperature Statistics

October Temperature

The Florida Keys - Marathon International Airport (2.5 miles)

  • Lowest 1 October, 2026

    76.6 °F

  • Average October

    84.9 °F

  • Highest 12 October, 2026

    90.6 °F

Climate (2021–2026)

The Florida Keys - Marathon International Airport (2.5 miles)

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  • Average Low 2021–2026

    75.6 °F

  • Average 2021–2026

    80.2 °F

  • Average High 2021–2026

    85.1 °F
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