Johnston Key - Southwest End Weather Forecast

    • 70
    • 75

    Mostly Sunny

    • 71
    • 76

    Partly Sunny

    • 69
    • 76

    Mostly Sunny

    • 63
    • 75

    Mostly Sunny

    • 63
    • 70

    Partly Sunny

    • 64
    • 71

    Mostly Sunny

Today 27 Dec Monroe Lower Keys

Mostly sunny. Highs in the upper 70s. Northeast Winds near 5 Mph, northeast to east.

Tonight 27 Dec Monroe Lower Keys

Partly cloudy. Lows in the upper 60s. Northeast to east Winds near 5 Mph.

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Johnston Key - Southwest End Temperature Statistics

December Temperature

Key West Naval Air Station (10.6 miles)

  • Lowest 11 December, 2025

    66.9 °F

  • Average December

    75.1 °F

  • Highest 7 December, 2025

    84.9 °F

Climate (2020–Present)

Key West Naval Air Station (10.6 miles)

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  • Average Low 2020–2025

    77.3 °F

  • Average 2020–2025

    81.8 °F

  • Average High 2020–2025

    86.5 °F
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