Johnston Key - Southwest End Weather Forecast

    • 69
    • 74

    Breezy

    • 70
    • 76

    Mostly Sunny

    • 71
    • 77

    Mostly Sunny

    • 71
    • 77

    Mostly Sunny

    • 71
    • 78

    Mostly Sunny

    • 72
    • 78

    Mostly Sunny

Today 20 Mar Monroe Lower Keys

Mostly sunny with a slight chance of Showers. Breezy early. Highs in the lower to mid 70s. North to northeast Winds 15 to 20 Mph, decreasing to near 15 Mph. Chance of rain 10 percent.

Tonight 20 Mar Monroe Lower Keys

Mostly clear. Lows in the mid 60s. North to northeast Winds 10 to 15 Mph.

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  • Temperature Real-Time

Johnston Key - Southwest End Temperature Statistics

March Temperature

Key West Naval Air Station (10.6 miles)

  • Lowest 1 March, 2026

    71.1 °F

  • Average March

    78.1 °F

  • Highest 5 March, 2026

    84 °F

Climate (2021–Present)

Key West Naval Air Station (10.6 miles)

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  • Average Low 2021–2026

    77.2 °F

  • Average 2021–2026

    81.7 °F

  • Average High 2021–2026

    86.5 °F
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