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.

Thunderstorm Rain Fog/Mist

41°F

5°C

Humidity 96%
Wind Speed N 10 G 25 mph
Barometer 29.94 in (1014.4 mb)
Dewpoint 40°F (4°C)
Visibility 2.50 mi
Wind Chill35°F (2°C)
Last update 4 Apr 2:51 am CDT
Extended Forecast for

McHenry IL

Flood Watch April 4, 03:02am until April 4, 10:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch April 4, 03:02am until April 4, 10:00am

    NOW until 10:00am Sat

    Flood Watch

  • Overnight

    Low: 38 °F

    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms before 9am, then a slight chance of showers between 9am and 10am. Cloudy, with a high near 56. Breezy, with a south wind 10 to 15 mph becoming west 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 40%.

    High: 56 °F

    Breezy.
    Chance
    Showers then
    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 33. Breezy, with a west wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 33 °F

    Mostly Cloudy
    and Breezy
    then Mostly
    Cloudy

  • Sunday

    Sunday: Mostly cloudy, then gradually becoming sunny, with a high near 51. West northwest wind around 15 mph, with gusts as high as 30 mph.

    High: 51 °F

    Decreasing
    Clouds

  • Sunday Night

    Sunday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 35. West wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 35 °F

    Slight Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 47.

    High: 47 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 22.

    Low: 22 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 40.

    High: 40 °F

    Sunny

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Low around 38. East wind 10 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A chance of showers and thunderstorms before 9am, then a slight chance of showers between 9am and 10am. Cloudy, with a high near 56. Breezy, with a south wind 10 to 15 mph becoming west 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 40%.
Saturday Night
Mostly cloudy, with a low around 33. Breezy, with a west wind 15 to 20 mph, with gusts as high as 30 mph.
Sunday
Mostly cloudy, then gradually becoming sunny, with a high near 51. West northwest wind around 15 mph, with gusts as high as 30 mph.
Sunday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 35. West wind 5 to 10 mph, with gusts as high as 15 mph.
Monday
Mostly sunny, with a high near 47.
Monday Night
Mostly clear, with a low around 22.
Tuesday
Sunny, with a high near 40.
Tuesday Night
Mostly cloudy, with a low around 30.
Wednesday
Mostly cloudy, with a high near 64.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 49.
Thursday
A chance of showers. Mostly cloudy, with a high near 62.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 43.
Friday
A chance of showers. Mostly cloudy, with a high near 64.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
1:21 am CDT Apr 4, 2026
Forecast Valid:
3am CDT Apr 4, 2026-6pm CDT Apr 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