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

41°F

5°C

Humidity 65%
Wind Speed Calm
Barometer 30.03 in (1017.5 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 14 Feb 9:51 am CST
Extended Forecast for

McHenry IL

  • Today

    Today: Mostly cloudy, with a high near 51. Calm wind becoming west southwest around 5 mph in the afternoon.

    High: 51 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 30. South southeast wind around 5 mph becoming calm.

    Low: 30 °F

    Mostly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 54. West southwest wind around 5 mph becoming north northwest in the afternoon. Winds could gust as high as 10 mph.

    High: 54 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 35. Calm wind becoming south southwest around 5 mph after midnight. Winds could gust as high as 15 mph.

    Low: 35 °F

    Partly Cloudy

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 60. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 60 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 53.

    High: 53 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A chance of rain. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Chance Rain

  • Wednesday

    Wednesday: A chance of rain before noon. Mostly sunny, with a high near 59.

    High: 59 °F

    Chance Rain
    then Mostly
    Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 51. Calm wind becoming west southwest around 5 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 30. South southeast wind around 5 mph becoming calm.
Sunday
Sunny, with a high near 54. West southwest wind around 5 mph becoming north northwest in the afternoon. Winds could gust as high as 10 mph.
Sunday Night
Partly cloudy, with a low around 35. Calm wind becoming south southwest around 5 mph after midnight. Winds could gust as high as 15 mph.
Washington's Birthday
Mostly sunny, with a high near 60. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Monday Night
Mostly cloudy, with a low around 40.
Tuesday
Mostly cloudy, with a high near 53.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 45.
Wednesday
A chance of rain before noon. Mostly sunny, with a high near 59.
Wednesday Night
Partly cloudy, with a low around 32.
Thursday
A chance of rain. Partly sunny, with a high near 47.
Thursday Night
A chance of rain and snow. Mostly cloudy, with a low around 29.
Friday
A chance of rain and snow. Mostly cloudy, with a high near 38.
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:
10:01 am CST Feb 14, 2026
Forecast Valid:
10am CST Feb 14, 2026-6pm CST Feb 20, 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