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.

Mostly Cloudy

14°F

-10°C

Humidity 61%
Wind Speed Calm
Barometer 30.21 in (1025.9 mb)
Dewpoint 3°F (-16°C)
Visibility 10.00 mi
Last update 20 Jan 6:51 pm CST
Extended Forecast for

McHenry IL

Winter Weather Advisory January 20, 08:00pm until January 21, 08:00am
Click here for hazard details and duration
Winter Weather Advisory

  • Tonight

    Tonight: Snow, mainly after 9pm. Temperature rising to around 18 by 1am. South southeast wind around 5 mph becoming west southwest after midnight. Chance of precipitation is 100%. Total nighttime snow accumulation of 2 to 4 inches possible.

    Low: 15 °F⇑

    Snow

  • Wednesday

    Wednesday: Snow likely with a chance of flurries before 4pm, then scattered flurries with isolated snow showers between 4pm and 5pm, then scattered snow showers after 5pm. Mostly cloudy, with a high near 25. West southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 25 °F

    Snow Likely
    then
    Scattered
    Snow Showers

  • Wednesday Night

    Wednesday Night: Snow showers likely, mainly before 10pm. Patchy blowing snow before 3am. Mostly cloudy, with a low around 9. Wind chill values as low as -5. Breezy, with a west wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.

    Low: 9 °F

    Snow Showers
    Likely and
    Patchy
    Blowing Snow

  • Thursday

    Thursday: Mostly sunny, with a high near 18. Wind chill values as low as -6. West wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 18 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around -12. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: -12 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny and cold, with a high near -5.

    High: -5 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around -12.

    Low: -12 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly cloudy and cold, with a high near 4.

    High: 4 °F

    Cold

  • Saturday Night

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

    Low: -2 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Snow, mainly after 9pm. Temperature rising to around 18 by 1am. South southeast wind around 5 mph becoming west southwest after midnight. Chance of precipitation is 100%. Total nighttime snow accumulation of 2 to 4 inches possible.
Wednesday
Snow likely with a chance of flurries before 4pm, then scattered flurries with isolated snow showers between 4pm and 5pm, then scattered snow showers after 5pm. Mostly cloudy, with a high near 25. West southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Wednesday Night
Snow showers likely, mainly before 10pm. Patchy blowing snow before 3am. Mostly cloudy, with a low around 9. Wind chill values as low as -5. Breezy, with a west wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.
Thursday
Mostly sunny, with a high near 18. Wind chill values as low as -6. West wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday Night
Partly cloudy, with a low around -12. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.
Friday
Mostly sunny and cold, with a high near -5.
Friday Night
Partly cloudy, with a low around -12.
Saturday
Mostly cloudy and cold, with a high near 4.
Saturday Night
Mostly cloudy, with a low around -2.
Sunday
Partly sunny, with a high near 12.
Sunday Night
Mostly cloudy, with a low around -2.
Monday
Mostly sunny, with a high near 13.
Monday Night
Partly cloudy, with a low around 3.
Tuesday
Partly sunny, with a high near 22.
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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:
3:11 pm CST Jan 20, 2026
Forecast Valid:
7pm CST Jan 20, 2026-6pm CST Jan 27, 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