Big Spanish Key Weather Forecast

    • 69
    • 74

    Mostly Sunny

    • 70
    • 76

    Mostly Sunny

    • 70
    • 76

    Mostly Sunny

    • 70
    • 77

    Mostly Sunny

    • 71
    • 78

    Mostly Sunny

    • 72
    • 79

    Mostly Sunny

    • 72
    • 79

    Partly Sunny

Today 21 Mar Monroe Lower Keys

Mostly sunny. Highs in the mid 70s. Northeast Winds 10 to 15 Mph, decreasing to 5 to 10 Mph.

Tonight 21 Mar Monroe Lower Keys

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

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Big Spanish Key Temperature Statistics

March Temperature

Key West Naval Air Station (21.7 miles)

  • Lowest 18 March, 2026

    64 °F

  • Average March

    77 °F

  • Highest 5 March, 2026

    84 °F

Climate (2021–Present)

Key West Naval Air Station (21.7 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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