Grassy Key Weather Forecast

    • 84
    • 87

    Slight Chance Thunderstorms

    • 84
    • 88

    Mostly Sunny

    • 83
    • 88

    Partly Sunny

    • 82
    • 87

    Partly Sunny

    • 83
    • 87

    Mostly Sunny

    • 83
    • 88

    Mostly Sunny

Today 21 Jun Monroe Middle Keys

Mostly sunny with a slight chance of Showers and Thunderstorms. Highs near 90. East to southeast Winds 5 to 10 Mph, briefly becoming variable near 5 Mph in the afternoon. Chance of rain 10 percent.

Tonight 21 Jun Monroe Middle Keys

Partly cloudy with a slight chance of Showers and Thunderstorms. Lows in the lower to mid 80s. North to northeast Winds 5 to 10 Mph, becoming east to southeast after midnight. Chance of rain 20 percent.

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Grassy Key Temperature Statistics

June Temperature

The Florida Keys - Marathon International Airport (6.2 miles)

  • Lowest 3 June, 2026

    74.6 °F

  • Average June

    84 °F

  • Highest 2 June, 2026

    90.6 °F

Climate (2021–2026)

The Florida Keys - Marathon International Airport (6.2 miles)

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  • Average Low 2021–2026

    75.3 °F

  • Average 2021–2026

    80 °F

  • Average High 2021–2026

    85 °F
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