Key West - South Side Weather Forecast

    • 81
    • 92

    Chance Thunderstorms

    • 82
    • 91

    Chance Thunderstorms

    • 82
    • 92

    Chance Thunderstorms

    • 82
    • 93

    Chance Thunderstorms

    • 82
    • 92

    Chance Thunderstorms

    • 82
    • 92

    Chance Thunderstorms

    • 83
    • 92

    Chance Thunderstorms

Today 6 Sep Monroe Lower Keys

Mostly cloudy with a chance of Showers and Thunderstorms. Highs near 90. Southeast Winds near 5 Mph, becoming variable. Chance of rain 50 percent.

Tonight 6 Sep Monroe Lower Keys

Partly cloudy with a chance of Showers and Thunderstorms. Lows in the lower 80s. Variable Winds near 5 Mph, becoming southeast to south. Chance of rain 40 percent.

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Key West - South Side Temperature Statistics

September Temperature

Key West International Airport (1.9 miles)

  • Lowest 1 September, 2026

    80.7 °F

  • Average September

    87 °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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