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Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

71°F

22°C

Humidity 68%
Wind Speed SE 13 G 24 mph
Barometer 29.81 in (1009.2 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 17 Apr 1:51 pm CDT
Extended Forecast for

McHenry IL

Flood Warning until further notice
Flood Watch April 17, 03:00pm until April 18, 05:00am
Tornado Watch until April 17, 08:00pm
Click here for hazard details and duration
Flood Warning until further notice
Flood Watch
Tornado Watch
  •  
    Flood Warning until further notice
    Tornado Watch until April 17, 08:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • This Afternoon

    High: 79 °F

    Severe
    Thunderstorms
    and Breezy

  • Tonight

    Tonight: Showers and thunderstorms before 3am, then a chance of showers. Some of the storms could be severe. Low around 41. South wind around 15 mph becoming west northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    Low: 41 °F

    Severe
    Thunderstorms
    then Showers
    Likely

  • Saturday

    Saturday: A 10 percent chance of showers before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 50. Breezy, with a west northwest wind around 20 mph, with gusts as high as 30 mph.

    High: 50 °F

    Breezy.
    Slight Chance
    Showers then
    Mostly 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. Northwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 49 °F

    Areas Frost
    then Partly
    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 53.

    High: 53 °F

    Frost then
    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Some of the storms could be severe. Mostly sunny, with a high near 79. Breezy, with a south wind around 20 mph, with gusts as high as 30 mph.
Tonight
Showers and thunderstorms before 3am, then a chance of showers. Some of the storms could be severe. Low around 41. South wind around 15 mph becoming west northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Saturday
A 10 percent chance of showers before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 50. Breezy, with a west northwest wind around 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. Northwest wind 5 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 53.
Monday Night
Mostly cloudy, with a low around 42.
Tuesday
Mostly sunny, with a high near 71.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
Sunny, with a high near 68.
Wednesday Night
Partly cloudy, with a low around 50.
Thursday
Mostly sunny, with a high near 77.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
1:41 pm CDT Apr 17, 2026
Forecast Valid:
2pm 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