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.

Mostly Cloudy

44°F

7°C

Humidity 76%
Wind Speed SE 8 mph
Barometer 29.91 in (1013.5 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 21 Mar 10:51 am CDT
Extended Forecast for

McHenry IL

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 72. South southwest wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 72 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, with a low around 42. Southwest wind 5 to 15 mph becoming north northeast after midnight. Winds could gust as high as 20 mph.

    Low: 42 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers before 4pm. Mostly cloudy, with a temperature falling to around 41 by 4pm. Breezy, with a north northeast wind 15 to 20 mph, with gusts as high as 25 mph.

    High: 43 °F⇓

    Slight Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 27. North northeast wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 27 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 46. North wind around 5 mph, with gusts as high as 10 mph.

    High: 46 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 54.

    High: 54 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 52.

    High: 52 °F

    Mostly Cloudy

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 72. South southwest wind 10 to 15 mph, with gusts as high as 30 mph.
Tonight
Mostly cloudy, with a low around 42. Southwest wind 5 to 15 mph becoming north northeast after midnight. Winds could gust as high as 20 mph.
Sunday
A 20 percent chance of showers before 4pm. Mostly cloudy, with a temperature falling to around 41 by 4pm. Breezy, with a north northeast wind 15 to 20 mph, with gusts as high as 25 mph.
Sunday Night
Partly cloudy, with a low around 27. North northeast wind 5 to 15 mph, with gusts as high as 25 mph.
Monday
Sunny, with a high near 46. North wind around 5 mph, with gusts as high as 10 mph.
Monday Night
Partly cloudy, with a low around 30.
Tuesday
Mostly cloudy, with a high near 54.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
Mostly cloudy, with a high near 52.
Wednesday Night
Mostly cloudy, with a low around 42.
Thursday
A chance of showers. Mostly cloudy, with a high near 60.
Thursday Night
Mostly cloudy, with a low around 29.
Friday
Partly sunny, with a high near 43.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
11:16 am CDT Mar 21, 2026
Forecast Valid:
11am CDT Mar 21, 2026-6pm CDT Mar 27, 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