National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

A Few Clouds

20°F

-7°C

Humidity 40%
Wind Speed NW 12 mph
Barometer 30.17 in (1023.6 mb)
Dewpoint -1°F (-18°C)
Visibility 10.00 mi
Wind Chill8°F (-13°C)
Last update 17 Mar 12:51 pm CDT
Extended Forecast for

McHenry IL

  • This Afternoon

    This Afternoon: Increasing clouds, with a high near 22. West southwest wind 5 to 10 mph.

    High: 22 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Snow before 5am, then snow, possibly mixed with freezing rain. Low around 16. South wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. New snow accumulation of less than one inch possible.

    Low: 16 °F

    Chance Snow
    then Wintry
    Mix

  • Wednesday

    Wednesday: A chance of snow and freezing rain before 7am. Mostly cloudy, with a high near 38. Southwest wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.

    High: 38 °F

    Chance Wintry
    Mix then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 33. South southwest wind around 5 mph.

    Low: 33 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 47. Calm wind becoming north northwest around 5 mph in the morning. Winds could gust as high as 10 mph.

    High: 47 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 34.

    Low: 34 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 55.

    High: 55 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Increasing clouds, with a high near 22. West southwest wind 5 to 10 mph.
Tonight
Snow before 5am, then snow, possibly mixed with freezing rain. Low around 16. South wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. New snow accumulation of less than one inch possible.
Wednesday
A chance of snow and freezing rain before 7am. Mostly cloudy, with a high near 38. Southwest wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.
Wednesday Night
A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 33. South southwest wind around 5 mph.
Thursday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 47. Calm wind becoming north northwest around 5 mph in the morning. Winds could gust as high as 10 mph.
Thursday Night
Mostly cloudy, with a low around 34.
Friday
Mostly cloudy, with a high near 55.
Friday Night
Mostly cloudy, with a low around 38.
Saturday
Partly sunny, with a high near 65.
Saturday Night
Mostly cloudy, with a low around 45.
Sunday
Partly sunny, with a high near 60.
Sunday Night
Partly cloudy, with a low around 28.
Monday
Partly sunny, with a high near 41.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
1:21 pm CDT Mar 17, 2026
Forecast Valid:
1pm CDT Mar 17, 2026-6pm CDT Mar 23, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation