Flat Lake Weather Forecast

    • 23
    • 40

    Decreasing Clouds

    • 22
    • 35

    Mostly Sunny

    • 22
    • 41

    Partly Sunny

    • 25
    • 43

    Mostly Sunny

    • 24
    • 44

    Partly Sunny

    • 22
    • 42

    Partly Sunny

    • 23
    • 39

    Chance Snow

Today 9 Feb McHenry

Mostly cloudy. Northwest Winds around 15 Mph with Gusts up to 25 Mph.

Tonight 9 Feb McHenry

Mostly cloudy. Lows around 20. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Lake Temperature Statistics

February Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 2 February, 2026

    8.6 °F

  • Average February

    25.6 °F

  • Highest 5 February, 2026

    46.4 °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

    52 °F
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