Marathon Weather Forecast

    • 83
    • 90

    Chance Rain Showers

    • 83
    • 89

    Rain Showers Likely

    • 82
    • 89

    Thunderstorms Likely

    • 82
    • 89

    Chance Thunderstorms

    • 83
    • 89

    Chance Thunderstorms

    • 83
    • 90

    Chance Thunderstorms

Today 4 Aug Monroe Middle Keys

Partly sunny with a slight chance of Showers and Thunderstorms. Highs in the lower 90s. South Winds near 5 Mph, becoming east and increasing to 5 to 10 Mph. Chance of rain 20 percent.

Tonight 4 Aug Monroe Middle Keys

Mostly cloudy with a chance of Showers and a slight chance of Thunderstorms. Lows in the lower 80s. East Winds 5 to 10 Mph, increasing to near 10 Mph. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Marathon Temperature Statistics

August Temperature

The Florida Keys - Marathon International Airport (2.5 miles)

  • Lowest 1 August, 2026

    82.9 °F

  • Average August

    86.6 °F

  • Highest 1 August, 2026

    91 °F

Climate (2021–2026)

The Florida Keys - Marathon International Airport (2.5 miles)

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  • Average Low 2021–2026

    75.4 °F

  • Average 2021–2026

    80.1 °F

  • Average High 2021–2026

    85.1 °F
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