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

65°F

18°C

Humidity 93%
Wind Speed Calm
Barometer 30.11 in (1018.6 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 28 Aug 9:51 pm CDT
Extended Forecast for

McHenry IL

  • Tonight

    Tonight: Partly cloudy, with a low around 60. South southwest wind around 5 mph.

    Low: 60 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of showers between 4pm and 5pm. Mostly cloudy, with a high near 79. South southwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.

    High: 79 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A slight chance of showers before 7pm, then a chance of showers after 3am. Mostly cloudy, with a low around 67. South wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers, mainly before 7am. Partly sunny, with a high near 86. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 86 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 70. South southwest wind 5 to 10 mph.

    Low: 70 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: Partly sunny, with a high near 89.

    High: 89 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 74.

    Low: 74 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: Partly sunny, with a high near 89.

    High: 89 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72.

    Low: 72 °F

    Mostly Cloudy
    then Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 60. South southwest wind around 5 mph.
Saturday
A slight chance of showers between 4pm and 5pm. Mostly cloudy, with a high near 79. South southwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.
Saturday Night
A slight chance of showers before 7pm, then a chance of showers after 3am. Mostly cloudy, with a low around 67. South wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.
Sunday
A 30 percent chance of showers, mainly before 7am. Partly sunny, with a high near 86. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 70. South southwest wind 5 to 10 mph.
Monday
Partly sunny, with a high near 89.
Monday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 74.
Tuesday
Partly sunny, with a high near 89.
Tuesday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72.
Wednesday
Mostly sunny, with a high near 89.
Wednesday Night
Partly cloudy, with a low around 70.
Thursday
Mostly sunny, with a high near 86.
Thursday Night
A chance of showers. Partly cloudy, with a low around 69.
Friday
Mostly sunny, with a high near 86.
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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:
9:06 pm CDT Aug 28, 2026
Forecast Valid:
10pm CDT Aug 28, 2026-6pm CDT Sep 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