Flat Lake Weather Forecast

    • 27
    • 43

    Mostly Cloudy

    • 29
    • 41

    Mostly Cloudy

    • 29
    • 43

    Mostly Cloudy

    • 28
    • 43

    Mostly Cloudy

    • 25
    • 39

    Mostly Cloudy

    • 25
    • 40

    Mostly Cloudy

Today 16 Nov McHenry

Mostly Clear, then becoming mostly sunny in the Morning, then becoming partly sunny. Highs in the lower 40s. Southwest Winds around 5 Mph, becoming southeast up to 5 Mph.

Tonight 16 Nov McHenry

Decreasing Clouds. Lows in the upper 20s. East 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

    35.7 °F

  • Highest 2 November, 2025

    59 °F

Climate (2020–Present)

Harvey Municipal Airport (22.4 miles)

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  • Average Low 2020–2025

    30.4 °F

  • Average 2020–2025

    41.4 °F

  • Average High 2020–2025

    52.1 °F
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