Key West - South Side Weather Forecast

    • 81
    • 92

    Chance Thunderstorms

    • 82
    • 92

    Chance Thunderstorms

    • 81
    • 92

    Rain Showers Likely

    • 80
    • 91

    Rain Showers Likely

    • 80
    • 90

    Rain Showers Likely

    • 80
    • 91

    Chance Thunderstorms

    • 81
    • 91

    Chance Thunderstorms

Today 13 Sep Monroe Lower Keys

Partly cloudy with a chance of Showers and Thunderstorms. Highs in the lower 90s. Southeast Winds 5 to 10 Mph, becoming light and variable. Chance of rain 50 percent.

Tonight 13 Sep Monroe Lower Keys

Partly cloudy with a chance of Showers and Thunderstorms. Lows in the lower 80s. Light and variable Winds, becoming east to southeast near 5 Mph. Chance of rain 30 percent.

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Key West - South Side Temperature Statistics

September Temperature

Key West International Airport (1.9 miles)

  • Lowest 5 September, 2026

    78.7 °F

  • Average September

    86.4 °F

  • Highest 3 September, 2026

    91.7 °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

    84.1 °F
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