Grassy Key - South Side Weather Forecast

    • 68
    • 77

    Mostly Sunny

    • 71
    • 76

    Mostly Sunny

    • 72
    • 76

    Mostly Sunny

    • 72
    • 78

    Mostly Sunny

    • 72
    • 77

    Breezy

    • 71
    • 77

    Chance Rain Showers

Today 24 Mar Monroe Middle Keys

Mostly sunny. Highs in the upper 70s. Northeast Winds 5 to 10 Mph.

Tonight 24 Mar Monroe Middle Keys

Mostly clear. Lows in the mid to upper 60s. Northeast Winds near 5 Mph.

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Grassy Key - South Side Temperature Statistics

March Temperature

The Florida Keys - Marathon International Airport (5.6 miles)

  • Lowest 18 March, 2026

    61.6 °F

  • Average March

    76.5 °F

  • Highest 16 March, 2026

    84.7 °F

Climate (2021–Present)

The Florida Keys - Marathon International Airport (5.6 miles)

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  • Average Low 2021–2026

    75.3 °F

  • Average 2021–2026

    80 °F

  • Average High 2021–2026

    85.1 °F
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