Grassy Key - South Side Weather Forecast

    • 67
    • 77

    Partly Sunny

    • 68
    • 75

    Mostly Sunny

    • 72
    • 77

    Mostly Cloudy

    • 72
    • 78

    Chance Rain Showers

    • 70
    • 78

    Chance Rain Showers

    • 70
    • 76

    Partly Sunny

Today 10 Dec Monroe Middle Keys

Partly sunny with a slight chance of Showers. Highs in the upper 70s. North to northeast Winds 5 to 10 Mph, becoming northwest to north. Chance of rain 10 percent.

Tonight 10 Dec Monroe Middle Keys

Partly cloudy with a slight chance of Showers. Lows near 70. Northwest Winds 5 to 10 Mph. Chance of rain 10 percent.

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Grassy Key - South Side Temperature Statistics

December Temperature

The Florida Keys - Marathon International Airport (5.6 miles)

  • Lowest 5 December, 2025

    73 °F

  • Average December

    78.7 °F

  • Highest 1 December, 2025

    82 °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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