Flat Lake Weather Forecast

    • 10
    • 23

    Mostly Cloudy

    • 7
    • 20

    Mostly Cloudy

    • 6
    • 20

    Chance Snow

    • -2
    • 17

    Mostly Cloudy

    • -2
    • 11

    Mostly Cloudy

    • -4
    • 12

    Mostly Cloudy

Today 26 Nov McHenry

Mostly cloudy. Highs in the mid 20s. Northwest Winds around 10 Mph.

Tonight 26 Nov McHenry

Mostly cloudy. Lows around 10. Northwest Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Lake Temperature Statistics

November Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 10 November, 2025

    12.2 °F

  • Average November

    36.8 °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

    30.5 °F

  • Average 2020–2025

    41.5 °F

  • Average High 2020–2025

    52.2 °F
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