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

30°F

-1°C

Humidity 69%
Wind Speed SE 6 mph
Barometer 30.43 in (1031.9 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 23 Mar 8:51 pm CDT
Extended Forecast for

McHenry IL

  • Tonight

    Tonight: Increasing clouds, with a low around 27. East southeast wind 5 to 10 mph becoming south after midnight. Winds could gust as high as 15 mph.

    Low: 27 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 51. South southwest wind around 10 mph, with gusts as high as 20 mph.

    High: 51 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 36. Southeast wind around 5 mph, with gusts as high as 10 mph.

    Low: 36 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 64. South wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 64 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 50. South southwest wind around 5 mph, with gusts as high as 10 mph.

    Low: 50 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 40 percent chance of showers after 1pm. Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 29.

    Low: 29 °F

    Chance
    Showers

  • Friday

    Friday: Partly sunny, with a high near 43.

    High: 43 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 25.

    Low: 25 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 27. East southeast wind 5 to 10 mph becoming south after midnight. Winds could gust as high as 15 mph.
Tuesday
Mostly cloudy, with a high near 51. South southwest wind around 10 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly cloudy, with a low around 36. Southeast wind around 5 mph, with gusts as high as 10 mph.
Wednesday
Mostly cloudy, with a high near 64. South wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly cloudy, with a low around 50. South southwest wind around 5 mph, with gusts as high as 10 mph.
Thursday
A 40 percent chance of showers after 1pm. Partly sunny, with a high near 72.
Thursday Night
A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 29.
Friday
Partly sunny, with a high near 43.
Friday Night
Mostly clear, with a low around 25.
Saturday
Sunny, with a high near 51.
Saturday Night
Mostly clear, with a low around 34.
Sunday
Partly sunny, with a high near 57.
Sunday Night
Partly cloudy, with a low around 39.
Monday
Partly sunny, with a high near 58.
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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:
8:11 pm CDT Mar 23, 2026
Forecast Valid:
8pm CDT Mar 23, 2026-6pm CDT Mar 30, 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