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Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

62°F

17°C

Humidity 73%
Wind Speed SE 10 mph
Barometer 29.86 in (1011.1 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 17 Apr 11:51 am CDT
Extended Forecast for

McHenry IL

Flood Warning until further notice
Flood Watch April 17, 03:00pm until April 18, 05:00am
Click here for hazard details and duration
Flood Warning until further notice
Flood Watch
  •  
    Flood Warning until further notice

    NOW until further notice

    Flood Warning

  • This Afternoon

    High: 79 °F

    Slight Chance
    T-storms and
    Breezy

  • Tonight

    Tonight: Showers and thunderstorms before 2am, then a chance of showers. Low around 41. Breezy, with a south wind 15 to 20 mph becoming west northwest after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 41 °F

    T-storms and
    Breezy then
    Showers
    Likely

  • Saturday

    Saturday: A 10 percent chance of showers before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 48. Breezy, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 48 °F

    Breezy.
    Slight Chance
    Showers then
    Sunny

  • Saturday Night

    Saturday Night: Areas of frost after 1am. Otherwise, mostly clear, with a low around 32. West northwest wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 32 °F

    Mostly Clear
    then Areas
    Frost

  • Sunday

    Sunday: Areas of frost before 8am. Otherwise, mostly sunny, with a high near 49. West northwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 49 °F

    Areas Frost
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Widespread frost, mainly after midnight. Otherwise, mostly clear, with a low around 30.

    Low: 30 °F

    Frost

  • Monday

    Monday: Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 55.

    High: 55 °F

    Frost then
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 79. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph.
Tonight
Showers and thunderstorms before 2am, then a chance of showers. Low around 41. Breezy, with a south wind 15 to 20 mph becoming west northwest after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
A 10 percent chance of showers before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 48. Breezy, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph.
Saturday Night
Areas of frost after 1am. Otherwise, mostly clear, with a low around 32. West northwest wind 5 to 15 mph, with gusts as high as 25 mph.
Sunday
Areas of frost before 8am. Otherwise, mostly sunny, with a high near 49. West northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Widespread frost, mainly after midnight. Otherwise, mostly clear, with a low around 30.
Monday
Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 55.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
Mostly sunny, with a high near 71.
Tuesday Night
Partly cloudy, with a low around 49.
Wednesday
Sunny, with a high near 71.
Wednesday Night
Partly cloudy, with a low around 50.
Thursday
Mostly sunny, with a high near 76.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
11:01 am CDT Apr 17, 2026
Forecast Valid:
12pm CDT Apr 17, 2026-6pm CDT Apr 23, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation