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Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Light Rain

39°F

4°C

Humidity 86%
Wind Speed E 5 mph
Barometer 29.97 in (1015.7 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 30 Apr 6:51 pm CDT
Extended Forecast for

McHenry IL

Flood Warning April 30, 07:41pm until May 5, 01:00am
Click here for hazard details and duration
Flood Warning
  •  
    Flood Warning April 30, 07:41pm until May 5, 01:00am

    NOW until 1:00am Tue

    Flood Warning

  • Tonight

    Low: 37 °F

    Showers then
    Scattered
    Showers

  • Friday

    Friday: Isolated showers after 4pm. Partly sunny, with a high near 49. North wind 5 to 10 mph. Chance of precipitation is 20%.

    High: 49 °F

    Partly Sunny
    then Isolated
    Showers

  • Friday Night

    Friday Night: Isolated showers before 10pm. Widespread frost, mainly after 3am. Otherwise, partly cloudy, with a low around 33. East northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 33 °F

    Isolated
    Showers then
    Frost

  • Saturday

    Saturday: Widespread frost, mainly before 7am. Otherwise, mostly sunny, with a high near 54. North northwest wind 5 to 10 mph.

    High: 54 °F

    Frost then
    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 38. West wind 5 to 10 mph becoming south in the evening.

    Low: 38 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 63.

    High: 63 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 30 percent chance of showers, mainly before 1am. Partly cloudy, with a low around 46.

    Low: 46 °F

    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

Detailed Forecast

Tonight
Showers, mainly before midnight. Low around 37. East wind around 5 mph becoming northwest after midnight. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Isolated showers after 4pm. Partly sunny, with a high near 49. North wind 5 to 10 mph. Chance of precipitation is 20%.
Friday Night
Isolated showers before 10pm. Widespread frost, mainly after 3am. Otherwise, partly cloudy, with a low around 33. East northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Saturday
Widespread frost, mainly before 7am. Otherwise, mostly sunny, with a high near 54. North northwest wind 5 to 10 mph.
Saturday Night
Partly cloudy, with a low around 38. West wind 5 to 10 mph becoming south in the evening.
Sunday
Partly sunny, with a high near 63.
Sunday Night
A 30 percent chance of showers, mainly before 1am. Partly cloudy, with a low around 46.
Monday
Mostly sunny, with a high near 72.
Monday Night
A chance of showers. Partly cloudy, with a low around 47.
Tuesday
A chance of showers after 1pm. Partly sunny, with a high near 62.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 41.
Wednesday
A chance of showers. Partly sunny, with a high near 58.
Wednesday Night
Mostly cloudy, with a low around 39.
Thursday
Partly sunny, with a high near 58.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
6:56 pm CDT Apr 30, 2026
Forecast Valid:
7pm CDT Apr 30, 2026-6pm CDT May 7, 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