Grassy Key Weather Forecast

    • 72
    • 77

    Mostly Sunny

    • 75
    • 83

    Mostly Sunny

    • 76
    • 85

    Mostly Sunny

    • 73
    • 85

    Partly Sunny

    • 67
    • 81

    Slight Chance Rain Showers

    • 69
    • 77

    Mostly Sunny

Today 13 Mar Monroe Middle Keys

Partly sunny with a slight chance of Showers. Highs near 80. East to southeast Winds 10 to 15 Mph. Chance of rain 10 percent.

Tonight 13 Mar Monroe Middle Keys

Mostly clear. Lows in the lower 70s. East to southeast Winds near 10 Mph, becoming light and variable early this evening.

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Grassy Key Temperature Statistics

March Temperature

The Florida Keys - Marathon International Airport (6.2 miles)

  • Lowest 7 March, 2025

    59.6 °F

  • Average March

    73.6 °F

  • Highest 5 March, 2025

    82.7 °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

    85.3 °F
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