Lostmans River - Onion Key Weather Forecast

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    • 93

    Chance Thunderstorms

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    • 93

    Chance Thunderstorms

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    • 92

    Thunderstorms Likely

    • 74
    • 92

    Thunderstorms Likely

    • 74
    • 93

    Chance Thunderstorms

    • 74
    • 91

    Chance Thunderstorms

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    • 93

    Slight Chance Thunderstorms

Today 10 Aug Mainland Monroe

Sunny. A chance of Showers and Thunderstorms this afternoon. Highs in the lower 90s. Southeast Winds 5 to 10 Mph. Gusts up to 20 Mph this afternoon. Chance of rain 50 percent. Heat index Values up to 107.

Tonight 10 Aug Mainland Monroe

Mostly clear. A slight chance of Showers and Thunderstorms this evening. Lows in the mid 70s. East Winds 5 to 10 Mph. Gusts up to 20 Mph this evening. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lostmans River - Onion Key Temperature Statistics

August Temperature

Miami, Kendall-Tamiami Executive Airport (43.5 miles)

  • Lowest 3 August, 2026

    75 °F

  • Average August

    85.1 °F

  • Highest 1 August, 2026

    94.6 °F

Climate (2021–2026)

Miami, Kendall-Tamiami Executive Airport (43.5 miles)

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  • Average Low 2021–2026

    68.9 °F

  • Average 2021–2026

    77.2 °F

  • Average High 2021–2026

    85.8 °F
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