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

51°F

11°C

Humidity 35%
Wind Speed W 5 mph
Barometer 29.73 in (1007.3 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 27 Feb 7:51 pm CST
Extended Forecast for

McHenry IL

  • Tonight

    Tonight: Mostly clear, with a low around 27. Northwest wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 27 °F

    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of snow, mainly between 11am and 3pm. Mostly cloudy, with a high near 34. Northeast wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 34 °F

    Chance Snow

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 20. North wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 20 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 31. North northeast wind around 5 mph, with gusts as high as 15 mph.

    High: 31 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of snow. Mostly cloudy, with a low around 18. East northeast wind around 5 mph becoming calm in the evening.

    Low: 18 °F

    Slight Chance
    Snow

  • Monday

    Monday: Partly sunny, with a high near 39.

    High: 39 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy
    then Chance
    Rain

  • Tuesday

    Tuesday: A chance of rain. Cloudy, with a high near 42.

    High: 42 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: A chance of rain before midnight. Mostly cloudy, with a low around 30.

    Low: 30 °F

    Chance Rain
    then Partly
    Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 27. Northwest wind 5 to 15 mph, with gusts as high as 25 mph.
Saturday
A 30 percent chance of snow, mainly between 11am and 3pm. Mostly cloudy, with a high near 34. Northeast wind 5 to 15 mph, with gusts as high as 20 mph.
Saturday Night
Mostly cloudy, with a low around 20. North wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday
Partly sunny, with a high near 31. North northeast wind around 5 mph, with gusts as high as 15 mph.
Sunday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 18. East northeast wind around 5 mph becoming calm in the evening.
Monday
Partly sunny, with a high near 39.
Monday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 29.
Tuesday
A chance of rain. Cloudy, with a high near 42.
Tuesday Night
A chance of rain before midnight. Mostly cloudy, with a low around 30.
Wednesday
A chance of rain after noon. Partly sunny, with a high near 47.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 36.
Thursday
Rain likely. Cloudy, with a high near 51.
Thursday Night
A chance of rain. Cloudy, with a low around 38.
Friday
A chance of rain. Cloudy, with a high near 54.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
8:32 pm CST Feb 27, 2026
Forecast Valid:
8pm CST Feb 27, 2026-6pm CST Mar 6, 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