Key West - South Side Weather Forecast

    • 77
    • 88

    Rain Showers Likely

    • 77
    • 88

    Rain Showers Likely

    • 78
    • 87

    Rain Showers

    • 79
    • 89

    Rain Showers

    • 79
    • 90

    Rain Showers Likely

    • 80
    • 90

    Chance Thunderstorms

Today 28 Sep Monroe Lower Keys

Partly cloudy with a slight chance of Showers and Thunderstorms. Highs in the upper 80s. Light and variable Winds, becoming southwest around 5 Mph in the afternoon. Chance of rain 20 percent.

Tonight 28 Sep Monroe Lower Keys

Showers likely with a chance of Thunderstorms. Lows in the upper 70s. South Winds near 5 Mph. Chance of rain 60 percent.

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Key West - South Side Temperature Statistics

September Temperature

Key West International Airport (1.9 miles)

  • Lowest 20 September, 2026

    76.6 °F

  • Average September

    85.2 °F

  • Highest 12 September, 2026

    94.6 °F

Climate (2021–2026)

Key West International Airport (1.9 miles)

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  • Average Low 2021–2026

    75.7 °F

  • Average 2021–2026

    79.8 °F

  • Average High 2021–2026

    84.2 °F
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