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

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Light Snow

33°F

1°C

Humidity 70%
Wind Speed SE 7 mph
Barometer 30.12 in (1021.4 mb)
Dewpoint 24°F (-4°C)
Visibility 9.00 mi
Wind Chill27°F (-3°C)
Last update 14 Mar 4:51 pm CDT
Extended Forecast for

McHenry IL

  • Tonight

    Tonight: A slight chance of snow showers between 10pm and midnight, then a slight chance of rain showers after midnight. Cloudy, with a temperature rising to around 39 by 4am. East southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 35 °F⇑

    Slight Chance
    Snow Showers
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers, then showers and possibly a thunderstorm after 10am. High near 60. Breezy, with a south wind 15 to 20 mph, with gusts as high as 40 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 60 °F

    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Rain showers before 10pm, then rain showers, snow, and sleet between 10pm and 11pm, then snow after 11pm. Patchy blowing snow after 1am. Low around 20. Windy, with a west wind 20 to 30 mph becoming north in the evening. Winds could gust as high as 45 mph. Chance of precipitation is 100%. New snow and sleet accumulation of 1 to 3 inches possible.

    Low: 20 °F

    Wintry Mix
    and Breezy
    then Snow and
    Patchy
    Blowing Snow

  • Monday

    Monday: Snow, mainly before 1pm. Areas of blowing snow. High near 23. Wind chill values as low as 1. Windy, with a northwest wind 25 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

    High: 23 °F

    Snow and
    Areas Blowing
    Snow

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 8. Blustery, with a west northwest wind 15 to 20 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 30 mph.

    Low: 8 °F

    Mostly Cloudy
    and Blustery
    then Partly
    Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 23.

    High: 23 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Snow showers likely, mainly after 1am. Mostly cloudy, with a low around 18. Chance of precipitation is 70%.

    Low: 18 °F

    Chance Snow
    Showers then
    Snow Showers
    Likely

  • Wednesday

    Wednesday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 30.

    Low: 30 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A slight chance of snow showers between 10pm and midnight, then a slight chance of rain showers after midnight. Cloudy, with a temperature rising to around 39 by 4am. East southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Sunday
A chance of showers, then showers and possibly a thunderstorm after 10am. High near 60. Breezy, with a south wind 15 to 20 mph, with gusts as high as 40 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
Rain showers before 10pm, then rain showers, snow, and sleet between 10pm and 11pm, then snow after 11pm. Patchy blowing snow after 1am. Low around 20. Windy, with a west wind 20 to 30 mph becoming north in the evening. Winds could gust as high as 45 mph. Chance of precipitation is 100%. New snow and sleet accumulation of 1 to 3 inches possible.
Monday
Snow, mainly before 1pm. Areas of blowing snow. High near 23. Wind chill values as low as 1. Windy, with a northwest wind 25 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.
Monday Night
Mostly cloudy, with a low around 8. Blustery, with a west northwest wind 15 to 20 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 30 mph.
Tuesday
Mostly sunny, with a high near 23.
Tuesday Night
Snow showers likely, mainly after 1am. Mostly cloudy, with a low around 18. Chance of precipitation is 70%.
Wednesday
Partly sunny, with a high near 42.
Wednesday Night
Mostly cloudy, with a low around 30.
Thursday
Mostly sunny, with a high near 53.
Thursday Night
Mostly cloudy, with a low around 35.
Friday
Mostly sunny, with a high near 56.
Friday Night
Mostly cloudy, with a low around 36.
Saturday
Partly sunny, with a high near 58.
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ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
3:06 pm CDT Mar 14, 2026
Forecast Valid:
5pm CDT Mar 14, 2026-6pm CDT Mar 21, 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