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Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Overcast

73°F

23°C

Humidity 90%
Wind Speed NW 6 mph
Barometer 30.00 in (1014.9 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 5 Aug 5:51 pm CDT
Extended Forecast for

McHenry IL

  • Tonight

    Tonight: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 4am. Mostly cloudy, with a low around 66. West southwest wind 5 to 10 mph becoming light and variable in the evening. Chance of precipitation is 50%.

    Low: 66 °F

    Chance
    Showers then
    Slight Chance
    Showers

  • Thursday

    Thursday: Cloudy, then gradually becoming mostly sunny, with a high near 77. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 77 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 62. Southeast wind around 5 mph becoming calm in the evening.

    Low: 62 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 82. Calm wind becoming south southwest around 5 mph in the afternoon. Winds could gust as high as 10 mph.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 66. Southwest wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 40%.

    Low: 66 °F

    Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear
    then Chance
    T-storms

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82.

    High: 82 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy
    then Chance
    T-storms

Detailed Forecast

Tonight
A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 4am. Mostly cloudy, with a low around 66. West southwest wind 5 to 10 mph becoming light and variable in the evening. Chance of precipitation is 50%.
Thursday
Cloudy, then gradually becoming mostly sunny, with a high near 77. Calm wind becoming southeast around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 62. Southeast wind around 5 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 82. Calm wind becoming south southwest around 5 mph in the afternoon. Winds could gust as high as 10 mph.
Friday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 66. Southwest wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 40%.
Saturday
Sunny, with a high near 81.
Saturday Night
A 40 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 64.
Sunday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82.
Sunday Night
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66.
Monday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81.
Monday Night
A chance of showers. Mostly cloudy, with a low around 65.
Tuesday
A chance of showers. Partly sunny, with a high near 78.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 61.
Wednesday
Partly sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
5:51 pm CDT Aug 5, 2026
Forecast Valid:
6pm CDT Aug 5, 2026-6pm CDT Aug 12, 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