Flat Lake Weather Forecast

    • 2
    • 28

    Partly Sunny

    • 2
    • 12

    Increasing Clouds

    • 24
    • 35

    Partly Sunny

    • 34
    • 41

    Slight Chance Rain

    • 20
    • 39

    Mostly Cloudy

    • 21
    • 31

    Mostly Cloudy

    • 14
    • 36

    Chance Snow

Today 9 Jan McHenry

Mostly clear. Northwest Winds around 20 Mph with Gusts up to 30 Mph.

Tonight 9 Jan McHenry

Mostly clear. Lows near zero. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Lake Temperature Statistics

January Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 1 January, 2026

    1.4 °F

  • Average January

    19.3 °F

  • Highest 7 January, 2026

    41 °F

Climate (2021–Present)

Harvey Municipal Airport (22.4 miles)

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  • Average Low 2021–2026

    30.2 °F

  • Average 2021–2026

    41.2 °F

  • Average High 2021–2026

    51.9 °F
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