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

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Overcast

64°F

18°C

Humidity 81%
Wind Speed NE 6 mph
Barometer 29.95 in (1013.6 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 28 Jun 12:51 am CDT
Extended Forecast for

McHenry IL

  • Overnight

    Overnight: Partly cloudy, with a low around 61. Northeast wind around 5 mph.

    Low: 61 °F

    Partly Cloudy

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Mostly sunny, with a high near 81. East southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 81 °F

    Mostly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms between midnight and 1am. Mostly cloudy, with a low around 74. Southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 74 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 92. Heat index values as high as 105. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 92 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 77. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 61. Northeast wind around 5 mph.
Sunday
A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Mostly sunny, with a high near 81. East southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Sunday Night
A slight chance of showers and thunderstorms between midnight and 1am. Mostly cloudy, with a low around 74. Southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 92. Heat index values as high as 105. South wind 10 to 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 77. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
Sunny, with a high near 94.
Tuesday Night
Mostly clear, with a low around 77.
Wednesday
Sunny, with a high near 94.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
A chance of showers and thunderstorms after 1pm. Sunny, with a high near 94.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Independence Day
A chance of showers and thunderstorms. Mostly sunny, with a high near 90.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.32°N 88.26°W
Last Update:
1:20 am CDT Jun 28, 2026
Forecast Valid:
2am CDT Jun 28, 2026-6pm CDT Jul 4, 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