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 78%
Wind Speed SW 3 mph
Barometer 30.04 in (1018.4 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 18 Mar 10:51 pm CDT
Extended Forecast for

McHenry IL

  • Tonight

    Tonight: A 20 percent chance of showers after 4am. Mostly cloudy, with a low around 30. West southwest wind around 5 mph becoming calm.

    Low: 30 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: A 20 percent chance of showers before 8am. Mostly sunny, with a high near 50. Calm wind becoming east around 5 mph in the morning.

    High: 50 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 34. East wind 5 to 10 mph becoming south southwest after midnight.

    Low: 34 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 62. West southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 62 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 38. North northwest wind around 5 mph becoming calm in the evening.

    Low: 38 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 50.

    High: 50 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of showers after 4am. Mostly cloudy, with a low around 30. West southwest wind around 5 mph becoming calm.
Thursday
A 20 percent chance of showers before 8am. Mostly sunny, with a high near 50. Calm wind becoming east around 5 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 34. East wind 5 to 10 mph becoming south southwest after midnight.
Friday
Mostly cloudy, with a high near 62. West southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Friday Night
Mostly cloudy, with a low around 38. North northwest wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 66.
Saturday Night
Partly cloudy, with a low around 41.
Sunday
Mostly cloudy, with a high near 50.
Sunday Night
Mostly cloudy, with a low around 26.
Monday
Mostly sunny, with a high near 42.
Monday Night
Mostly cloudy, with a low around 28.
Tuesday
Mostly cloudy, with a high near 50.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Mostly cloudy, with a high near 55.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
9:46 pm CDT Mar 18, 2026
Forecast Valid:
10pm CDT Mar 18, 2026-6pm CDT Mar 25, 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