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.

Overcast

41°F

5°C

Humidity 62%
Wind Speed E 3 mph
Barometer 30.16 in (1022.1 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 19 Apr 6:51 pm CDT
Extended Forecast for

McHenry IL

Flood Warning until further notice
Freeze Warning April 20, 12:00am until April 20, 09:00am
Click here for hazard details and duration
Flood Warning until further notice
Freeze Warning
  •  
    Flood Warning until further notice

    NOW until further notice

    Flood Warning

  • Tonight

    Low: 26 °F

    Frost

  • Monday

    Monday: Widespread frost before 9am. Otherwise, sunny, with a high near 52. Light and variable wind becoming south southwest 5 to 10 mph in the morning.

    High: 52 °F

    Frost then
    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 72. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 72 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 46. West wind around 5 mph becoming north northeast after midnight. Winds could gust as high as 10 mph.

    Low: 46 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 54.

    Low: 54 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 79. Breezy.

    High: 79 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

Detailed Forecast

Tonight
Widespread frost, mainly after midnight. Otherwise, mostly cloudy, then gradually becoming clear, with a low around 26. Northwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
Monday
Widespread frost before 9am. Otherwise, sunny, with a high near 52. Light and variable wind becoming south southwest 5 to 10 mph in the morning.
Monday Night
Mostly cloudy, with a low around 42. South wind around 10 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 72. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Partly cloudy, with a low around 46. West wind around 5 mph becoming north northeast after midnight. Winds could gust as high as 10 mph.
Wednesday
Sunny, with a high near 72.
Wednesday Night
Mostly clear, with a low around 54.
Thursday
Mostly sunny, with a high near 79. Breezy.
Thursday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 60.
Friday
A chance of showers. Mostly cloudy, with a high near 71.
Friday Night
A chance of showers. Mostly cloudy, with a low around 45.
Saturday
Partly sunny, with a high near 63.
Saturday Night
Mostly cloudy, with a low around 42.
Sunday
Partly sunny, with a high near 61.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
6:46 pm CDT Apr 19, 2026
Forecast Valid:
6pm CDT Apr 19, 2026-6pm CDT Apr 26, 2026
 
Forecast Discussion
 
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Additional Resources

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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