Johnston Key - Southwest End Weather Forecast

    • 80
    • 88

    Rain Showers Likely

    • 81
    • 88

    Rain Showers Likely

    • 80
    • 89

    Rain Showers

    • 80
    • 89

    Rain Showers Likely

    • 81
    • 89

    Rain Showers Likely

    • 81
    • 89

    Rain Showers Likely

Today 20 Sep Monroe Lower Keys

Showers likely with a chance of Thunderstorms. Highs in the upper 80s. South to southwest Winds near 5 Mph. Chance of rain 60 percent.

Tonight 20 Sep Monroe Lower Keys

Showers likely with a chance of Thunderstorms. Lows near 80. Southeast to south Winds 5 to 10 Mph. Chance of rain 60 percent.

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  • Temperature Real-Time

Johnston Key - Southwest End Temperature Statistics

September Temperature

Key West Naval Air Station (10.6 miles)

  • Lowest 17 September, 2026

    77 °F

  • Average September

    85.6 °F

  • Highest 12 September, 2026

    91.9 °F

Climate (2021–2026)

Key West Naval Air Station (10.6 miles)

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  • Average Low 2021–2026

    77.3 °F

  • Average 2021–2026

    81.8 °F

  • Average High 2021–2026

    86.5 °F
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