Flat Lake Weather Forecast

    • -7
    • 9

    Cold

    • -6
    • 10

    Partly Sunny

    • -7
    • 8

    Cold

    • 13
    • 24

    Partly Sunny

    • 6
    • 25

    Chance Snow

    • 9
    • 23

    Partly Sunny

Today 20 Feb McHenry

Partly sunny. Highs 5 to 10 above. Northwest Winds 10 to 15 Mph. Wind Chills around 25 below in the morning.

Tonight 20 Feb McHenry

Decreasing Clouds. Lows around 5 below. Northwest Winds 5 to 10 Mph. Wind Chills around 20 below.

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  • Temperature Forecast NOAA

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Flat Lake Temperature Statistics

February Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 2 February, 2026

    8.6 °F

  • Average February

    30.3 °F

  • Highest 13 February, 2026

    50 °F

Climate (2021–Present)

Harvey Municipal Airport (22.4 miles)

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  • Average Low 2021–2026

    30.4 °F

  • Average 2021–2026

    41.4 °F

  • Average High 2021–2026

    52.2 °F
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