Marathon Weather Forecast

    • 83
    • 92

    Slight Chance Thunderstorms

    • 84
    • 91

    Slight Chance Thunderstorms

    • 84
    • 93

    Mostly Sunny

    • 84
    • 93

    Chance Thunderstorms

    • 84
    • 89

    Chance Thunderstorms

    • 84
    • 89

    Slight Chance Thunderstorms

    • 84
    • 90

    Mostly Sunny

Today 6 Jul Monroe Middle Keys

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

Tonight 6 Jul Monroe Middle Keys

Partly cloudy with a slight chance of Showers and Thunderstorms. Lows in the lower to mid 80s. Southeast Winds 5 to 10 Mph, becoming east to southeast. Chance of rain 10 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 1 July, 2026

    82.7 °F

  • Average July

    86.9 °F

  • Highest 3 July, 2026

    90.6 °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 °F

  • Average High 2021–2026

    85 °F
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