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.

Overcast

25°F

-4°C

Humidity 88%
Wind Speed W 7 mph
Barometer 29.93 in (1015.1 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill17°F (-8°C)
Last update 21 Jan 10:51 pm CST
Extended Forecast for

McHenry IL

Extreme Cold Watch January 23, 03:00am until January 23, 12:00pm
Click here for hazard details and duration
Extreme Cold Watch

  • Tonight

    Tonight: A 20 percent chance of snow before 1am. Partly cloudy, with a low around 12. Wind chill values as low as -2. West wind 10 to 15 mph, with gusts as high as 35 mph.

    Low: 12 °F

    Slight Chance
    Snow

  • Thursday

    Thursday: A 20 percent chance of snow after 3pm. Partly sunny, with a high near 19. Wind chill values as low as -3. Breezy, with a west wind 15 to 20 mph, with gusts as high as 35 mph.

    High: 19 °F

    Breezy.
    Mostly Sunny
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around -12. Wind chill values as low as -34. West northwest wind around 15 mph, with gusts as high as 30 mph.

    Low: -12 °F

    Partly Cloudy

  • Friday

    Friday: Sunny and cold, with a high near -5. Wind chill values as low as -35. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: -5 °F

    Cold

  • Friday Night

    Friday Night: Mostly cloudy, with a low around -12. North northwest wind 5 to 10 mph.

    Low: -12 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of snow, mainly after noon. Mostly cloudy and cold, with a high near 6.

    High: 6 °F

    Chance Snow

  • Saturday Night

    Saturday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 1.

    Low: 1 °F

    Chance Snow

  • Sunday

    Sunday: A chance of snow. Mostly cloudy, with a high near 14.

    High: 14 °F

    Chance Snow

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around -2.

    Low: -2 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of snow before 1am. Partly cloudy, with a low around 12. Wind chill values as low as -2. West wind 10 to 15 mph, with gusts as high as 35 mph.
Thursday
A 20 percent chance of snow after 3pm. Partly sunny, with a high near 19. Wind chill values as low as -3. Breezy, with a west wind 15 to 20 mph, with gusts as high as 35 mph.
Thursday Night
Partly cloudy, with a low around -12. Wind chill values as low as -34. West northwest wind around 15 mph, with gusts as high as 30 mph.
Friday
Sunny and cold, with a high near -5. Wind chill values as low as -35. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night
Mostly cloudy, with a low around -12. North northwest wind 5 to 10 mph.
Saturday
A 30 percent chance of snow, mainly after noon. Mostly cloudy and cold, with a high near 6.
Saturday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 1.
Sunday
A chance of snow. Mostly cloudy, with a high near 14.
Sunday Night
Mostly cloudy, with a low around -2.
Monday
Mostly sunny and cold, with a high near 9.
Monday Night
Partly cloudy, with a low around 0.
Tuesday
Partly sunny, with a high near 18.
Tuesday Night
Mostly cloudy, with a low around 5.
Wednesday
Partly sunny, with a high near 16.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
9:41 pm CST Jan 21, 2026
Forecast Valid:
11pm CST Jan 21, 2026-6pm CST Jan 28, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation