Marathon Weather Forecast

    • 80
    • 86

    Slight Chance Thunderstorms

    • 81
    • 86

    Chance Thunderstorms

    • 80
    • 86

    Chance Thunderstorms

    • 80
    • 86

    Chance Thunderstorms

    • 80
    • 86

    Rain Showers Likely

    • 80
    • 86

    Rain Showers Likely

Today 25 May Monroe Middle Keys

Mostly sunny with a slight chance of Showers and Thunderstorms. Breezy. Highs in the upper 80s. East Winds 15 to 20 Mph. Chance of rain 20 percent.

Tonight 25 May Monroe Middle Keys

Partly cloudy with a slight chance of Showers and Thunderstorms. Breezy. Lows around 80. Southeast Winds 15 to 20 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 4 May, 2026

    72.6 °F

  • Average May

    82 °F

  • Highest 8 May, 2026

    87.7 °F

Climate (2021–Present)

The Florida Keys - Marathon International Airport (2.5 miles)

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  • Average Low 2021–2026

    75.3 °F

  • Average 2021–2026

    80 °F

  • Average High 2021–2026

    85 °F
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