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

24°F

-4°C

Humidity 81%
Wind Speed S 12 G 21 mph
Barometer 30.02 in (1018.3 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill13°F (-11°C)
Last update 18 Mar 5:51 am CDT
Extended Forecast for

McHenry IL

  • Today

    Today: Snow showers, mainly before 7am. High near 38. South wind 10 to 15 mph. Chance of precipitation is 80%. Total daytime snow accumulation of less than a half inch possible.

    High: 38 °F

    Snow Showers
    then Mostly
    Sunny

  • Tonight

    Tonight: Scattered showers after 1am. Increasing clouds, with a low around 31. Southwest wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 50%.

    Low: 31 °F

    Mostly Cloudy
    then
    Scattered
    Showers

  • Thursday

    Thursday: Isolated showers before 1pm. Partly sunny, with a high near 49. South wind around 5 mph becoming northeast in the afternoon. Chance of precipitation is 20%.

    High: 49 °F

    Isolated
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 36. Northeast wind around 5 mph becoming south southwest after midnight.

    Low: 36 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 63. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 63 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 57.

    High: 57 °F

    Mostly Cloudy

Detailed Forecast

Today
Snow showers, mainly before 7am. High near 38. South wind 10 to 15 mph. Chance of precipitation is 80%. Total daytime snow accumulation of less than a half inch possible.
Tonight
Scattered showers after 1am. Increasing clouds, with a low around 31. Southwest wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 50%.
Thursday
Isolated showers before 1pm. Partly sunny, with a high near 49. South wind around 5 mph becoming northeast in the afternoon. Chance of precipitation is 20%.
Thursday Night
Mostly cloudy, with a low around 36. Northeast wind around 5 mph becoming south southwest after midnight.
Friday
Mostly cloudy, with a high near 63. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Friday Night
Mostly cloudy, with a low around 39.
Saturday
Mostly sunny, with a high near 66.
Saturday Night
Mostly cloudy, with a low around 41.
Sunday
Mostly cloudy, with a high near 57.
Sunday Night
Partly cloudy, with a low around 27.
Monday
Partly sunny, with a high near 42.
Monday Night
Partly cloudy, with a low around 28.
Tuesday
Partly sunny, with a high near 51.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
5:41 am CDT Mar 18, 2026
Forecast Valid:
6am CDT Mar 18, 2026-6pm CDT Mar 24, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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