Grassy Key - South Side Weather Forecast

    • 78
    • 84

    Chance Rain Showers

    • 78
    • 83

    Chance Rain Showers

    • 79
    • 83

    Chance Rain Showers

    • 76
    • 83

    Slight Chance Rain Showers

    • 75
    • 83

    Partly Sunny

    • 73
    • 81

    Partly Sunny

Today 24 Oct Monroe Middle Keys

Partly cloudy with a slight chance of Showers. Breezy, becoming windy. Highs in the mid 80s. Northeast to east Winds 15 to 20 Mph, increasing to near 20 Mph. Chance of rain 20 percent.

Tonight 24 Oct Monroe Middle Keys

Partly cloudy with a chance of Showers and a slight chance of Thunderstorms. Windy. Lows in the mid to upper 70s. Northeast Winds 20 to 25 Mph. Chance of rain 30 percent.

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Grassy Key - South Side Temperature Statistics

October Temperature

The Florida Keys - Marathon International Airport (5.6 miles)

  • Lowest 10 October, 2025

    75 °F

  • Average October

    80.8 °F

  • Highest 2 October, 2025

    88 °F

Climate (2020–Present)

The Florida Keys - Marathon International Airport (5.6 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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