Flat Lake Weather Forecast

    • 18
    • 30

    Slight Chance Wintry Mix

    • 35
    • 48

    Partly Sunny

    • 30
    • 58

    Mostly Cloudy

    • 23
    • 41

    Mostly Cloudy

    • 17
    • 34

    Chance Snow

    • 19
    • 34

    Chance Snow

Today 6 Mar McHenry

Mostly cloudy. A chance of freezing drizzle and snow early in the morning. Highs around 30. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of precipitation 40 percent.

Tonight 6 Mar McHenry

Decreasing Clouds. Lows 15 to 20. Northwest Winds 5 to 10 Mph, becoming southwest after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Lake Temperature Statistics

March Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 1 March, 2026

    -0.4 °F

  • Average March

    19.7 °F

  • Highest 2 March, 2026

    42.8 °F

Climate (2021–Present)

Harvey Municipal Airport (22.4 miles)

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  • Average Low 2021–2026

    30.4 °F

  • Average 2021–2026

    41.3 °F

  • Average High 2021–2026

    52.1 °F
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