Flat Lake Weather Forecast

    • 20
    • 42

    Breezy

    • 20
    • 34

    Partly Sunny

    • 32
    • 39

    Rain/Snow Likely

    • 23
    • 42

    Chance Rain/Snow

    • 24
    • 39

    Partly Sunny

    • 30
    • 49

    Partly Sunny

Today 5 Apr McHenry

Mostly cloudy. Highs in the lower 40s. Northwest Winds 15 to 25 Mph with Gusts up to 35 Mph.

Tonight 5 Apr McHenry

Increasing Clouds. Lows around 20. North Winds 10 to 15 Mph. Gusts up to 30 Mph in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Lake Temperature Statistics

April Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 1 April, 2026

    23 °F

  • Average April

    29.9 °F

  • Highest 1 April, 2026

    33.8 °F

Climate (2021–Present)

Harvey Municipal Airport (22.4 miles)

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  • Average Low 2021–2026

    30.3 °F

  • Average 2021–2026

    41.2 °F

  • Average High 2021–2026

    51.9 °F
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