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

55°F

13°C

Humidity 62%
Wind Speed W 14 mph
Barometer 29.74 in (1007.6 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Wind Chill51°F (11°C)
Last update 20 Mar 7:51 am CDT
Extended Forecast for

McHenry IL

  • Today

    Today: Partly sunny, with a high near 65. West southwest wind 10 to 15 mph becoming north northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 65 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 37. North wind 5 to 10 mph becoming east southeast after midnight.

    Low: 37 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 64. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 64 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 47. South southwest wind around 10 mph, with gusts as high as 15 mph.

    Low: 47 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers. Mostly cloudy, with a high near 57. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 57 °F

    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 30.

    Low: 30 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 47.

    High: 47 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 31.

    Low: 31 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 54.

    High: 54 °F

    Mostly Cloudy

Detailed Forecast

Today
Partly sunny, with a high near 65. West southwest wind 10 to 15 mph becoming north northwest in the afternoon. Winds could gust as high as 20 mph.
Tonight
Mostly cloudy, with a low around 37. North wind 5 to 10 mph becoming east southeast after midnight.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 64. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 47. South southwest wind around 10 mph, with gusts as high as 15 mph.
Sunday
A 20 percent chance of showers. Mostly cloudy, with a high near 57. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly cloudy, with a low around 30.
Monday
Mostly sunny, with a high near 47.
Monday Night
Mostly cloudy, with a low around 31.
Tuesday
Mostly cloudy, with a high near 54.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Partly sunny, with a high near 51.
Wednesday Night
Partly cloudy, with a low around 40.
Thursday
Mostly sunny, with a high near 59.
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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:
6:26 am CDT Mar 20, 2026
Forecast Valid:
8am CDT Mar 20, 2026-6pm CDT Mar 26, 2026
 
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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