National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Mostly Cloudy

76°F

24°C

Humidity 88%
Wind Speed SE 12 mph
Barometer 30.06 in (1016.9 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 15 Aug 10:51 am CDT
Extended Forecast for

McHenry IL

  • Today

    Today: A 30 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 80. South southeast wind around 5 mph, with gusts as high as 10 mph.

    High: 80 °F

    Chance
    Showers

  • Tonight

    Tonight: A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 71. Southwest wind around 5 mph. Chance of precipitation is 40%.

    Low: 71 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 9am. Partly sunny, with a high near 83. West northwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers then
    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 63. North northwest wind 5 to 10 mph.

    Low: 63 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 80. North wind around 5 mph becoming west northwest in the afternoon.

    High: 80 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 81.

    High: 81 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 77.

    High: 77 °F

    Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 80. South southeast wind around 5 mph, with gusts as high as 10 mph.
Tonight
A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 71. Southwest wind around 5 mph. Chance of precipitation is 40%.
Sunday
A chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 9am. Partly sunny, with a high near 83. West northwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Sunday Night
Partly cloudy, with a low around 63. North northwest wind 5 to 10 mph.
Monday
Sunny, with a high near 80. North wind around 5 mph becoming west northwest in the afternoon.
Monday Night
Mostly clear, with a low around 61.
Tuesday
Partly sunny, with a high near 81.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65.
Wednesday
A chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 77.
Wednesday Night
Mostly cloudy, with a low around 57.
Thursday
Mostly sunny, with a high near 73.
Thursday Night
Partly cloudy, with a low around 55.
Friday
Mostly sunny, with a high near 74.
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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:
8:46 am CDT Aug 15, 2026
Forecast Valid:
11am CDT Aug 15, 2026-6pm CDT Aug 21, 2026
 
Forecast Discussion
 
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Additional Resources

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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