Marathon Weather Forecast

    • 83
    • 90

    Slight Chance Thunderstorms

    • 83
    • 90

    Slight Chance Thunderstorms

    • 83
    • 91

    Mostly Sunny

    • 83
    • 90

    Chance Thunderstorms

    • 84
    • 89

    Mostly Sunny

    • 84
    • 89

    Mostly Sunny

    • 83
    • 89

    Partly Sunny

Today 20 Jul Monroe Middle Keys

Mostly sunny with a slight chance of Showers and Thunderstorms. Highs near 90. Southeast to south Winds near 10 Mph, decreasing to 5 to 10 Mph. Chance of rain 10 percent.

Tonight 20 Jul Monroe Middle Keys

Partly cloudy with a slight chance of Showers and Thunderstorms. Lows in the lower to mid 80s. Southeast Winds near 10 Mph, increasing to 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 10 July, 2026

    74.6 °F

  • Average July

    86.8 °F

  • Highest 16 July, 2026

    93.7 °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 °F
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