Key West - South Side Weather Forecast

    • 76
    • 89

    Rain Showers

    • 78
    • 88

    Rain Showers

    • 78
    • 89

    Rain Showers Likely

    • 79
    • 89

    Chance Thunderstorms

    • 79
    • 89

    Chance Thunderstorms

    • 80
    • 90

    Chance Rain Showers

Today 17 Sep Monroe Lower Keys

Showers likely with a chance of Thunderstorms. Highs in the upper 80s. Northeast Winds 10 to 15 Mph. Chance of rain 70 percent.

Tonight 17 Sep Monroe Lower Keys

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

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Key West - South Side Temperature Statistics

September Temperature

Key West International Airport (1.9 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 (1.9 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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