Big Spanish Key Weather Forecast

    • 79
    • 87

    Rain Showers Likely

    • 80
    • 87

    Rain Showers Likely

    • 80
    • 88

    Chance Thunderstorms

    • 80
    • 88

    Chance Thunderstorms

    • 80
    • 87

    Chance Thunderstorms

    • 79
    • 87

    Chance Thunderstorms

Today 30 Sep Monroe Lower Keys

Showers likely with a chance of Thunderstorms. Highs in the upper 80s. East to southeast Winds near 10 Mph, increasing to 10 to 15 Mph in the afternoon. Chance of rain 70 percent.

Tonight 30 Sep Monroe Lower Keys

Showers with a chance of Thunderstorms. Breezy. Lows in the upper 70s. East to southeast Winds 15 to 20 Mph. Chance of rain 80 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Spanish Key Temperature Statistics

September Temperature

Key West Naval Air Station (21.7 miles)

  • Lowest 17 September, 2026

    77 °F

  • Average September

    84.5 °F

  • Highest 12 September, 2026

    91.9 °F

Climate (2021–2026)

Key West Naval Air Station (21.7 miles)

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  • Average Low 2021–2026

    77.3 °F

  • Average 2021–2026

    81.8 °F

  • Average High 2021–2026

    86.5 °F
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