McHenry Weather Forecast

    • 19
    • 21

    Snow

    • 34
    • 39

    Slight Chance Rain

    • 34
    • 49

    Mostly Cloudy

    • 37
    • 55

    Mostly Cloudy

    • 36
    • 59

    Mostly Cloudy

    • 27
    • 53

    Mostly Cloudy

Today 17 Mar McHenry

Mostly sunny in the Morning, then becoming mostly cloudy. Highs in the lower 20s. Northwest Winds around 10 Mph, becoming southwest in the afternoon.

Tonight 17 Mar McHenry

Snow. Snow accumulation around an inch. Lows around 18. South Winds 5 to 10 Mph, increasing to 10 to 15 Mph after midnight. Chance of precipitation 90 percent.

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McHenry Temperature Statistics

March Temperature

Chicago/Waukegan Regional Airport (21.1 miles)

  • Lowest 1 March, 2026

    18.6 °F

  • Average March

    39.9 °F

  • Highest 9 March, 2026

    73 °F

Climate (2021–Present)

Chicago/Waukegan Regional Airport (21.1 miles)

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  • Average Low 2021–2026

    42.3 °F

  • Average 2021–2026

    51.1 °F

  • Average High 2021–2026

    59.7 °F
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