Flat Lake Weather Forecast

    • 25
    • 47

    Increasing Clouds

    • 26
    • 41

    Mostly Cloudy

    • 31
    • 43

    Chance Rain Showers

    • 28
    • 51

    Partly Sunny

    • 31
    • 49

    Mostly Cloudy

    • 33
    • 49

    Mostly Cloudy

Today 25 Oct McHenry

Sunny. Highs in the mid 40s. Northwest Winds 5 to 10 Mph.

Tonight 25 Oct McHenry

Increasing Clouds. Lows in the mid 20s. Northeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Lake Temperature Statistics

October Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 19 October, 2026

    24.8 °F

  • Average October

    49.8 °F

  • Highest 22 October, 2026

    78.8 °F

Climate (2021–2026)

Harvey Municipal Airport (22.4 miles)

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  • Average Low 2021–2026

    30.4 °F

  • Average 2021–2026

    41.1 °F

  • Average High 2021–2026

    51.8 °F
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