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.

Overcast

23°F

-5°C

Humidity 68%
Wind Speed NE 6 mph
Barometer 30.26 in (1026.9 mb)
Dewpoint 14°F (-10°C)
Visibility 10.00 mi
Wind Chill16°F (-9°C)
Last update 3 Feb 4:51 pm CST
Extended Forecast for

McHenry IL

  • Tonight

    Tonight: Partly cloudy, with a low around 10. North northwest wind around 5 mph.

    Low: 10 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 25. North northwest wind around 5 mph, with gusts as high as 10 mph.

    High: 25 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 12. Calm wind becoming southwest around 5 mph after midnight. Winds could gust as high as 10 mph.

    Low: 12 °F

    Increasing
    Clouds

  • Thursday

    Thursday: A 20 percent chance of snow before noon. Mostly cloudy, with a high near 32. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 32 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Thursday Night

    Thursday Night: A 40 percent chance of snow after midnight. Mostly cloudy, with a low around 26. Southwest wind 10 to 15 mph becoming west northwest after midnight. Winds could gust as high as 25 mph.

    Low: 26 °F

    Mostly Cloudy
    then Chance
    Snow

  • Friday

    Friday: A 20 percent chance of snow after noon. Mostly cloudy, with a high near 39. Breezy.

    High: 39 °F

    Breezy.
    Mostly Cloudy
    then Slight
    Chance Snow

  • Friday Night

    Friday Night: Mostly clear, with a low around 10.

    Low: 10 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 27.

    High: 27 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 20.

    Low: 20 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 10. North northwest wind around 5 mph.
Wednesday
Mostly sunny, with a high near 25. North northwest wind around 5 mph, with gusts as high as 10 mph.
Wednesday Night
Increasing clouds, with a low around 12. Calm wind becoming southwest around 5 mph after midnight. Winds could gust as high as 10 mph.
Thursday
A 20 percent chance of snow before noon. Mostly cloudy, with a high near 32. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Thursday Night
A 40 percent chance of snow after midnight. Mostly cloudy, with a low around 26. Southwest wind 10 to 15 mph becoming west northwest after midnight. Winds could gust as high as 25 mph.
Friday
A 20 percent chance of snow after noon. Mostly cloudy, with a high near 39. Breezy.
Friday Night
Mostly clear, with a low around 10.
Saturday
Mostly sunny, with a high near 27.
Saturday Night
Mostly cloudy, with a low around 20.
Sunday
Partly sunny, with a high near 31.
Sunday Night
Mostly cloudy, with a low around 18.
Monday
Partly sunny, with a high near 36.
Monday Night
Mostly cloudy, with a low around 25.
Tuesday
Partly sunny, with a high near 41.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
4:01 pm CST Feb 3, 2026
Forecast Valid:
5pm CST Feb 3, 2026-6pm CST Feb 10, 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