Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fog

47°F

8°C

Humidity 100%
Wind Speed NE 3 mph
Barometer 29.94 in (1013.7 mb)
Dewpoint 47°F (8°C)
Visibility 0.25 mi
Last update 16 Apr 9:51 pm CDT
Extended Forecast for

McHenry IL

Flood Warning until further notice
Dense Fog Advisory April 16, 10:04pm until April 17, 10:00am
Click here for hazard details and duration
Flood Warning until further notice
Dense Fog Advisory
  •  
    Flood Warning until further notice
    Dense Fog Advisory April 16, 10:04pm until April 17, 10:00am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Tonight

    Low: 49 °F

    Fog

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 4pm.  Widespread fog, mainly before 8am.  Otherwise, partly sunny, with a high near 80. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 80 °F

    Fog then
    Chance
    T-storms and
    Breezy

  • Friday Night

    Friday Night: Showers and thunderstorms before 10pm, then showers and possibly a thunderstorm, mainly after 10pm.  Low around 41. South wind around 15 mph becoming west after midnight. Winds could gust as high as 25 mph.  Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 41 °F

    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm.  Cloudy, then gradually becoming mostly sunny, with a high near 53. Breezy, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 53 °F

    Slight Chance
    Showers and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 32. West northwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 32 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

  • Sunday Night

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

    Low: 30 °F

    Partly Cloudy
    then Areas
    Frost

  • Monday

    Monday: Areas of frost before 9am.  Otherwise, sunny, with a high near 57.

    High: 57 °F

    Areas Frost
    then Sunny

Detailed Forecast

Tonight
Widespread fog, mainly after 11pm. Otherwise, mostly cloudy, with a low around 49. East southeast wind around 5 mph, with gusts as high as 10 mph.
Friday
A 30 percent chance of showers and thunderstorms after 4pm. Widespread fog, mainly before 8am. Otherwise, partly sunny, with a high near 80. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph.
Friday Night
Showers and thunderstorms before 10pm, then showers and possibly a thunderstorm, mainly after 10pm. Low around 41. South wind around 15 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
A 20 percent chance of showers before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 53. Breezy, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph.
Saturday Night
Mostly clear, with a low around 32. West northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday
Mostly sunny, with a high near 49.
Sunday Night
Areas of frost after midnight. Otherwise, mostly clear, with a low around 30.
Monday
Areas of frost before 9am. Otherwise, sunny, with a high near 57.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
Mostly sunny, with a high near 72.
Tuesday Night
Partly cloudy, with a low around 47.
Wednesday
Sunny, with a high near 69.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Mostly sunny, with a high near 70.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
9:45 pm CDT Apr 16, 2026
10pm CDT Apr 16, 2026-6pm CDT Apr 23, 2026
 
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