Lostmans River - Onion Key Weather Forecast

    • 62
    • 83

    Mostly Sunny

    • 64
    • 86

    Mostly Sunny

    • 69
    • 86

    Mostly Sunny

    • 66
    • 86

    Partly Sunny

    • 54
    • 81

    Mostly Sunny

    • 57
    • 81

    Mostly Sunny

    • 60
    • 83

    Mostly Sunny

Today 13 Mar Mainland Monroe

Sunny. Near steady temperature around 80. South Winds around 10 Mph.

Tonight 13 Mar Mainland Monroe

Mostly clear with a slight chance of Showers this Evening, then partly cloudy after midnight. Lows in the lower 60s. South Winds 5 to 10 Mph, becoming northeast after midnight. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lostmans River - Onion Key Temperature Statistics

March Temperature

Miami, Kendall-Tamiami Executive Airport (43.5 miles)

  • Lowest 7 March, 2025

    45.6 °F

  • Average March

    69.9 °F

  • Highest 5 March, 2025

    86.6 °F

Climate (2020–Present)

Miami, Kendall-Tamiami Executive Airport (43.5 miles)

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  • Average Low 2020–2025

    70 °F

  • Average 2020–2025

    77.6 °F

  • Average High 2020–2025

    85.9 °F
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