Flat Lake Weather Forecast

    • 27
    • 48

    Slight Chance Rain

    • 23
    • 43

    Mostly Sunny

    • 30
    • 46

    Partly Sunny

    • 28
    • 48

    Partly Sunny

    • 25
    • 47

    Partly Sunny

    • 25
    • 43

    Mostly Cloudy

Today 19 Nov McHenry

Mostly cloudy. Patchy fog in the morning. Highs in the mid 40s. Southwest Winds around 5 Mph.

Tonight 19 Nov McHenry

Mostly cloudy. Lows in the upper 20s. Northwest Winds 5 to 10 Mph.

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Flat Lake Temperature Statistics

November Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 10 November, 2025

    12.2 °F

  • Average November

    36.5 °F

  • Highest 14 November, 2025

    69.8 °F

Climate (2020–Present)

Harvey Municipal Airport (22.4 miles)

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  • Average Low 2020–2025

    30.4 °F

  • Average 2020–2025

    41.4 °F

  • Average High 2020–2025

    52.1 °F
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