Grassy Key - South Side Weather Forecast

    • 79
    • 84

    Mostly Sunny

    • 80
    • 84

    Mostly Sunny

    • 80
    • 84

    Mostly Sunny

    • 80
    • 84

    Mostly Sunny

    • 80
    • 84

    Mostly Sunny

    • 81
    • 84

    Mostly Sunny

Today 15 May Monroe Middle Keys

Mostly clear. Highs in the mid to upper 80s. Lows in the upper 70s. East Winds 5 to 10 Mph.

Tonight 15 May Monroe Middle Keys

Mostly clear. Highs in the mid to upper 80s. Lows in the upper 70s. East Winds 5 to 10 Mph.

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Grassy Key - South Side Temperature Statistics

May Temperature

The Florida Keys - Marathon International Airport (5.6 miles)

  • Lowest 12 May, 2025

    75 °F

  • Average May

    82 °F

  • Highest 11 May, 2025

    86.6 °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

    79.9 °F

  • Average High 2020–2025

    85.2 °F
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