National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

33°F

1°C

Humidity 42%
Wind Speed NW 8 mph
Barometer 30.01 in (1016.8 mb)
Dewpoint 12°F (-11°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 28 Feb 4:51 am CST
Extended Forecast for

McHenry IL

  • Today

    Today: A 50 percent chance of snow, mainly between 10am and 5pm. Cloudy, with a steady temperature around 30. North wind 5 to 10 mph becoming east northeast in the afternoon. Winds could gust as high as 20 mph.

    High: 30 °F

    Chance Snow

  • Tonight

    Tonight: A 20 percent chance of snow before 8pm. Mostly cloudy, with a low around 19. Northeast wind around 10 mph, with gusts as high as 15 mph.

    Low: 19 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 31. North northeast wind 5 to 10 mph.

    High: 31 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 18. East wind around 5 mph becoming calm in the evening.

    Low: 18 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 40. Light east southeast wind becoming south southeast 5 to 10 mph in the morning. Winds could gust as high as 15 mph.

    High: 40 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A slight chance of rain before midnight, then rain likely, possibly mixed with freezing rain between midnight and 3am, then rain likely after 3am. Mostly cloudy, with a low around 32. Chance of precipitation is 60%.

    Low: 32 °F

    Slight Chance
    Rain then
    Rain/Freezing
    Rain Likely

  • Tuesday

    Tuesday: Rain, mainly before noon. High near 41. Chance of precipitation is 80%.

    High: 41 °F

    Rain then
    Chance Rain

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of rain after noon. Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny
    then Chance
    Rain

Detailed Forecast

Today
A 50 percent chance of snow, mainly between 10am and 5pm. Cloudy, with a steady temperature around 30. North wind 5 to 10 mph becoming east northeast in the afternoon. Winds could gust as high as 20 mph.
Tonight
A 20 percent chance of snow before 8pm. Mostly cloudy, with a low around 19. Northeast wind around 10 mph, with gusts as high as 15 mph.
Sunday
Partly sunny, with a high near 31. North northeast wind 5 to 10 mph.
Sunday Night
Partly cloudy, with a low around 18. East wind around 5 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 40. Light east southeast wind becoming south southeast 5 to 10 mph in the morning. Winds could gust as high as 15 mph.
Monday Night
A slight chance of rain before midnight, then rain likely, possibly mixed with freezing rain between midnight and 3am, then rain likely after 3am. Mostly cloudy, with a low around 32. Chance of precipitation is 60%.
Tuesday
Rain, mainly before noon. High near 41. Chance of precipitation is 80%.
Tuesday Night
Partly cloudy, with a low around 30.
Wednesday
A chance of rain after noon. Mostly sunny, with a high near 49.
Wednesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 38.
Thursday
A chance of rain. Mostly cloudy, with a high near 56.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 41.
Friday
A chance of rain. Cloudy, with a high near 60.
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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:
4:26 am CST Feb 28, 2026
Forecast Valid:
4am CST Feb 28, 2026-6pm CST Mar 6, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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