Marathon Weather Forecast

    • 80
    • 88

    Slight Chance Rain Showers

    • 81
    • 88

    Partly Sunny

    • 80
    • 89

    Partly Sunny

    • 78
    • 88

    Slight Chance Rain Showers

    • 80
    • 89

    Slight Chance Rain Showers

    • 78
    • 88

    Slight Chance Rain Showers

    • 77
    • 87

    Slight Chance Rain Showers

Today 9 May Monroe Middle Keys

Becoming mostly sunny with a slight chance of Showers. Highs in the mid to upper 80s. East to southeast Winds 10 to 15 Mph, becoming southeast and increasing to near 15 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Marathon Temperature Statistics

May Temperature

The Florida Keys - Marathon International Airport (2.5 miles)

  • Lowest 7 May, 2021

    78.1 °F
  • Average May

    82.8 °F
  • Highest 6 May, 2021

    89.1 °F

Climate (2010–Present)

The Florida Keys - Marathon International Airport (2.5 miles)

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  • Average Low 2010–Present

    75 °F
  • Average 2010–Present

    79.3 °F
  • Average High 2010–Present

    84.5 °F
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