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.

Fair

60°F

16°C

Humidity 100%
Wind Speed W 6 mph
Barometer 29.88 in (1011.4 mb)
Dewpoint 60°F (16°C)
Visibility 9.00 mi
Last update 25 Jun 3:51 am CDT
Extended Forecast for

McHenry IL

  • Today

    Today: Areas of fog before 7am. Otherwise, mostly sunny, with a high near 77. West northwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 77 °F

    Areas Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 55. North wind around 5 mph becoming calm in the evening.

    Low: 55 °F

    Mostly Cloudy

  • Friday

    Friday: A slight chance of showers between noon and 1pm. Mostly cloudy, with a high near 72. East wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.

    High: 72 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Cloudy, then gradually becoming partly cloudy, with a low around 57. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 57 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Mostly sunny, with a high near 78. East wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy
    then Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 87.

    High: 87 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 93.

    High: 93 °F

    Mostly Sunny

Detailed Forecast

Today
Areas of fog before 7am. Otherwise, mostly sunny, with a high near 77. West northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Tonight
Mostly cloudy, with a low around 55. North wind around 5 mph becoming calm in the evening.
Friday
A slight chance of showers between noon and 1pm. Mostly cloudy, with a high near 72. East wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.
Friday Night
Cloudy, then gradually becoming partly cloudy, with a low around 57. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday
Mostly sunny, with a high near 78. East wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62.
Sunday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 87.
Sunday Night
Partly cloudy, with a low around 73.
Monday
Mostly sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Mostly sunny, with a high near 94.
Tuesday Night
Mostly clear, with a low around 75.
Wednesday
Mostly sunny, with a high near 94.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.36°N 88.26°W
Last Update:
3:01 am CDT Jun 25, 2026
Forecast Valid:
4am CDT Jun 25, 2026-6pm CDT Jul 1, 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