Flat Lake Weather Forecast

    • -5
    • 6

    Cold

    • 20
    • 35

    Snow/Sleet

    • 10
    • 27

    Mostly Cloudy

    • 7
    • 20

    Chance Snow

    • 12
    • 21

    Mostly Cloudy

    • 21
    • 29

    Mostly Cloudy

    • 13
    • 38

    Mostly Cloudy

Today 30 Jan McHenry

Mostly clear. Southeast Winds around 10 Mph.

Tonight 30 Jan McHenry

Increasing Clouds. Lows around 5 below. South Winds around 15 Mph. Gusts up to 30 Mph after midnight. Wind Chills around 20 below.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Lake Temperature Statistics

January Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 25 January, 2026

    -25.6 °F

  • Average January

    10.9 °F

  • Highest 7 January, 2026

    41 °F

Climate (2021–Present)

Harvey Municipal Airport (22.4 miles)

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  • Average Low 2021–2026

    30.1 °F

  • Average 2021–2026

    41.1 °F

  • Average High 2021–2026

    51.8 °F
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