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.

Partly Cloudy

30°F

-1°C

Humidity 72%
Wind Speed NE 15 G 25 mph
Barometer 30.32 in (1027.7 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 27 Mar 5:51 am CDT
Extended Forecast for

McHenry IL

  • Today

    Today: Mostly sunny, with a high near 42. North northeast wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.

    High: 42 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 24. Northwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 24 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 48. South southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 48 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 37. South southwest wind around 15 mph.

    Low: 37 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 61. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 61 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 69.

    High: 69 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Showers likely, mainly after 1am. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 76.

    High: 76 °F

    Chance
    T-storms

Detailed Forecast

Today
Mostly sunny, with a high near 42. North northeast wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.
Tonight
Mostly clear, with a low around 24. Northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday
Sunny, with a high near 48. South southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph.
Saturday Night
Mostly cloudy, with a low around 37. South southwest wind around 15 mph.
Sunday
Partly sunny, with a high near 61. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Partly cloudy, with a low around 44.
Monday
Mostly sunny, with a high near 69.
Monday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 49.
Tuesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 76.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 49.
Wednesday
A chance of showers. Cloudy, with a high near 58.
Wednesday Night
A chance of showers. Cloudy, with a low around 39.
Thursday
A chance of showers. Mostly cloudy, with a high near 47.
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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:
5:21 am CDT Mar 27, 2026
Forecast Valid:
6am CDT Mar 27, 2026-6pm CDT Apr 2, 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