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 72%
Wind Speed SE 6 mph
Barometer 29.96 in (1016.0 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 9 Feb 4:51 pm CST
Extended Forecast for

McHenry IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 33. South wind around 10 mph becoming west after midnight. Winds could gust as high as 20 mph.

    Low: 33 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 40. West northwest wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 40 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 24. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 24 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 35. Northwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 35 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 21. Northwest wind around 5 mph becoming calm in the evening.

    Low: 21 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 36.

    High: 36 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A 20 percent chance of snow before midnight. Partly cloudy, with a low around 24.

    Low: 24 °F

    Slight Chance
    Snow then
    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 41.

    High: 41 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 33. South wind around 10 mph becoming west after midnight. Winds could gust as high as 20 mph.
Tuesday
Mostly sunny, with a high near 40. West northwest wind 10 to 15 mph, with gusts as high as 30 mph.
Tuesday Night
Partly cloudy, with a low around 24. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 35. Northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Wednesday Night
Partly cloudy, with a low around 21. Northwest wind around 5 mph becoming calm in the evening.
Thursday
Mostly cloudy, with a high near 36.
Thursday Night
A 20 percent chance of snow before midnight. Partly cloudy, with a low around 24.
Friday
Sunny, with a high near 41.
Friday Night
Partly cloudy, with a low around 26.
Saturday
Mostly cloudy, with a high near 42.
Saturday Night
A chance of rain and snow. Mostly cloudy, with a low around 30.
Sunday
A chance of rain and snow. Mostly sunny, with a high near 40.
Sunday Night
Partly cloudy, with a low around 28.
Washington's Birthday
Mostly cloudy, with a high near 43.
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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:
3:11 pm CST Feb 9, 2026
Forecast Valid:
5pm CST Feb 9, 2026-6pm CST Feb 16, 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