Key West Weather Forecast

    • 79
    • 88

    Slight Chance Thunderstorms

    • 80
    • 89

    Chance Rain Showers

    • 78
    • 90

    Rain Showers Likely

    • 77
    • 88

    Rain Showers Likely

    • 79
    • 88

    Rain Showers Likely

    • 79
    • 88

    Rain Showers Likely

    • 79
    • 88

    Chance Thunderstorms

Today 14 Sep Monroe Lower Keys

Mostly sunny with a slight chance of Showers and Thunderstorms. Highs near 90. Variable Winds near 5 Mph. Chance of rain 20 percent.

Tonight 14 Sep Monroe Lower Keys

Partly cloudy with a slight chance of Showers and Thunderstorms. Lows near 80. Variable Winds near 5 Mph, becoming northeast to east. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Key West Temperature Statistics

September Temperature

Key West International Airport (3.1 miles)

  • Lowest 4 September, 2025

    75 °F

  • Average September

    83.5 °F

  • Highest 11 September, 2025

    91 °F

Climate (2020–Present)

Key West International Airport (3.1 miles)

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  • Average Low 2020–2025

    75.6 °F

  • Average 2020–2025

    79.6 °F

  • Average High 2020–2025

    83.9 °F
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