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.

Fair

33°F

1°C

Humidity 82%
Wind Speed Calm
Barometer 29.95 in (1015.4 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 14 Feb 6:51 pm CST
Extended Forecast for

McHenry IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 33. South wind around 5 mph, with gusts as high as 10 mph.

    Low: 33 °F

    Mostly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 54. Northwest wind 5 to 10 mph.

    High: 54 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 35. Light and variable wind becoming south southwest 5 to 10 mph after midnight.

    Low: 35 °F

    Increasing
    Clouds

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 60. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 60 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 37. Southwest wind 5 to 10 mph becoming east after midnight.

    Low: 37 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 48.

    High: 48 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A chance of showers, with thunderstorms also possible after midnight. Mostly cloudy, with a low around 44. Chance of precipitation is 50%.

    Low: 44 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers before noon. Sunny, with a high near 63. Breezy.

    High: 63 °F

    Chance
    Showers then
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 35.

    Low: 35 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 33. South wind around 5 mph, with gusts as high as 10 mph.
Sunday
Sunny, with a high near 54. Northwest wind 5 to 10 mph.
Sunday Night
Increasing clouds, with a low around 35. Light and variable wind becoming south southwest 5 to 10 mph after midnight.
Washington's Birthday
Mostly sunny, with a high near 60. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.
Monday Night
Mostly cloudy, with a low around 37. Southwest wind 5 to 10 mph becoming east after midnight.
Tuesday
Mostly cloudy, with a high near 48.
Tuesday Night
A chance of showers, with thunderstorms also possible after midnight. Mostly cloudy, with a low around 44. Chance of precipitation is 50%.
Wednesday
A chance of showers before noon. Sunny, with a high near 63. Breezy.
Wednesday Night
Mostly clear, with a low around 35.
Thursday
A chance of showers after noon. Mostly sunny, with a high near 50.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 29.
Friday
A chance of rain and snow showers. Partly sunny, with a high near 40.
Friday Night
Mostly cloudy, with a low around 22.
Saturday
Partly sunny, with a high near 37.
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:
5:21 pm CST Feb 14, 2026
Forecast Valid:
7pm CST Feb 14, 2026-6pm CST Feb 21, 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