Marathon Weather Forecast

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    • 88

    Slight Chance Thunderstorms

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    Slight Chance Thunderstorms

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    Slight Chance Thunderstorms

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    • 88

    Chance Rain Showers

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    Chance Rain Showers

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    Chance Rain Showers

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    Chance Rain Showers

Today 18 Jul Monroe Middle Keys

Partly cloudy with a slight chance of Showers and Thunderstorms. Highs in the upper 80s. East to southeast Winds near 15 Mph. Chance of rain 20 percent.

Tonight 18 Jul Monroe Middle Keys

Partly cloudy with a slight chance of Showers and Thunderstorms. Lows in the lower 80s. East Winds 10 to 15 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Marathon Temperature Statistics

July Temperature

The Florida Keys - Marathon International Airport (2.5 miles)

  • Lowest 14 July, 2025

    75.9 °F

  • Average July

    84.7 °F

  • Highest 13 July, 2025

    93.7 °F

Climate (2020–Present)

The Florida Keys - Marathon International Airport (2.5 miles)

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  • Average Low 2020–2025

    75.3 °F

  • Average 2020–2025

    80 °F

  • Average High 2020–2025

    85.1 °F
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