Grassy Key Weather Forecast

    • 78
    • 83

    Chance Rain Showers

    • 77
    • 83

    Mostly Sunny

    • 77
    • 83

    Breezy

    • 77
    • 83

    Breezy

    • 77
    • 83

    Slight Chance Rain Showers

    • 77
    • 83

    Chance Rain Showers

Today 21 Oct Monroe Middle Keys

Mostly cloudy with a chance of Showers and a slight chance of Thunderstorms this morning. Partly cloudy with a slight chance of Showers this afternoon. Highs in the mid 80s. East Winds near 10 Mph. Chance of rain 30 percent.

Tonight 21 Oct Monroe Middle Keys

Mostly clear with a slight chance of Showers. Lows in the upper 70s. Northeast Winds near 10 Mph. Chance of rain 20 percent.

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Grassy Key Temperature Statistics

October Temperature

The Florida Keys - Marathon International Airport (6.2 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 (6.2 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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