Grassy Key - North Side Weather Forecast

    • 72
    • 79

    Partly Sunny

    • 71
    • 78

    Mostly Cloudy

    • 67
    • 78

    Chance Rain Showers

    • 69
    • 75

    Chance Rain Showers

    • 69
    • 76

    Chance Rain Showers

    • 66
    • 76

    Chance Rain Showers

    • 60
    • 74

    Chance Rain Showers

Today 9 Jan Monroe Middle Keys

Partly sunny. Highs near 80. East to southeast Winds 10 to 15 Mph.

Tonight 9 Jan Monroe Middle Keys

Mostly Clear, then becoming partly cloudy with a slight chance of Showers. Lows in the lower 70s. East to southeast Winds 10 to 15 Mph. Chance of rain 20 percent.

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Grassy Key - North Side Temperature Statistics

January Temperature

The Florida Keys - Marathon International Airport (7.5 miles)

  • Lowest 1 January, 2026

    55.9 °F

  • Average January

    69.5 °F

  • Highest 7 January, 2026

    79 °F

Climate (2021–Present)

The Florida Keys - Marathon International Airport (7.5 miles)

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  • Average Low 2021–2026

    75.4 °F

  • Average 2021–2026

    80 °F

  • Average High 2021–2026

    85.1 °F
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