Lostmans River - Onion Key Weather Forecast

    • 71
    • 95

    Increasing Clouds

    • 72
    • 96

    Mostly Cloudy

    • 72
    • 95

    Slight Chance Thunderstorms

    • 69
    • 93

    Chance Thunderstorms

    • 68
    • 92

    Chance Thunderstorms

    • 67
    • 92

    Slight Chance Thunderstorms

Today 9 May Mainland Monroe

Sunny. Highs in the mid 90s. South Winds 5 to 10 Mph.

Tonight 9 May Mainland Monroe

Mostly clear in the Evening, then becoming partly cloudy. Lows in the lower 70s. South Winds 5 to 10 Mph, becoming southeast after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lostmans River - Onion Key Temperature Statistics

May Temperature

Miami, Kendall-Tamiami Executive Airport (43.5 miles)

  • Lowest 1 May, 2026

    65.6 °F

  • Average May

    79.6 °F

  • Highest 2 May, 2026

    94.6 °F

Climate (2021–Present)

Miami, Kendall-Tamiami Executive Airport (43.5 miles)

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  • Average Low 2021–2026

    69 °F

  • Average 2021–2026

    77.1 °F

  • Average High 2021–2026

    85.7 °F
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