Flat Lake Weather Forecast

    • 41
    • 64

    Breezy

    • 35
    • 50

    Rain Showers

    • 28
    • 46

    Slight Chance Rain Showers

    • 32
    • 49

    Mostly Cloudy

    • 29
    • 50

    Partly Sunny

    • 33
    • 47

    Mostly Cloudy

Today 26 Oct McHenry

Mostly cloudy. Highs in the lower 60s. South Winds 15 to 25 Mph with Gusts up to 40 Mph.

Tonight 26 Oct McHenry

Cloudy. Lows in the upper 40s. Southeast Winds around 20 Mph with Gusts up to 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Lake Temperature Statistics

October Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 23 October, 2025

    24.8 °F

  • Average October

    49.7 °F

  • Highest 2 October, 2025

    86 °F

Climate (2020–Present)

Harvey Municipal Airport (22.4 miles)

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  • Average Low 2020–2025

    30.3 °F

  • Average 2020–2025

    41.3 °F

  • Average High 2020–2025

    52.1 °F
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