Flat Lake Weather Forecast

    • 35
    • 51

    Rain Showers

    • 34
    • 46

    Rain Showers

    • 33
    • 50

    Mostly Cloudy

    • 36
    • 58

    Partly Sunny

    • 34
    • 59

    Chance Rain Showers

    • 31
    • 53

    Partly Sunny

Today 11 Oct McHenry

Cloudy. A slight chance of Showers in the Morning, then Showers likely in the afternoon. Cooler. Highs in the lower 50s. Northeast Winds around 15 Mph with Gusts up to 25 Mph. Chance of rain 60 percent.

Tonight 11 Oct McHenry

Showers. Lows in the upper 30s. Northeast Winds around 10 Mph with Gusts up to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Lake Temperature Statistics

October Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 2 October, 2026

    33.8 °F

  • Average October

    51.7 °F

  • Highest 5 October, 2026

    73.4 °F

Climate (2021–2026)

Harvey Municipal Airport (22.4 miles)

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  • Average Low 2021–2026

    30.3 °F

  • Average 2021–2026

    41.1 °F

  • Average High 2021–2026

    51.7 °F
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