Marathon Weather Forecast

    • 81
    • 91

    Slight Chance Thunderstorms

    • 80
    • 91

    Chance Rain Showers

    • 80
    • 89

    Rain Showers Likely

    • 78
    • 87

    Rain Showers Likely

    • 80
    • 87

    Rain Showers Likely

    • 80
    • 89

    Chance Rain Showers

Today 29 Sep Monroe Middle Keys

Mostly sunny with a slight chance of Showers. Highs near 90. South Winds near 10 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

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Marathon Temperature Statistics

September Temperature

The Florida Keys - Marathon International Airport (2.5 miles)

  • Lowest 12 September, 2020

    73.9 °F
  • Average September

    84 °F
  • Highest 2 September, 2020

    93 °F

Climate (2010–Present)

The Florida Keys - Marathon International Airport (2.5 miles)

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  • Average Low 2010–Present

    75.8 °F
  • Average 2010–Present

    80.1 °F
  • Average High 2010–Present

    85.3 °F
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