Flat Lake Weather Forecast

    • 12
    • 27

    Increasing Clouds

    • 30
    • 40

    Mostly Cloudy

    • 29
    • 46

    Partly Sunny

    • 23
    • 45

    Partly Sunny

    • 29
    • 46

    Partly Sunny

    • 33
    • 53

    Mostly Cloudy

Today 9 Nov McHenry

Sunny. Highs in the upper 20s. Northwest Winds 5 to 15 Mph.

Tonight 9 Nov McHenry

Partly cloudy. Lows 10 to 15. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Lake Temperature Statistics

November Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 1 November, 2025

    28.4 °F

  • Average November

    39.1 °F

  • Highest 2 November, 2025

    59 °F

Climate (2020–Present)

Harvey Municipal Airport (22.4 miles)

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  • Average Low 2020–2025

    30.3 °F

  • Average 2020–2025

    41.4 °F

  • Average High 2020–2025

    52.1 °F
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