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.

Fair

20°F

-7°C

Humidity 81%
Wind Speed N 3 mph
Barometer 30.60 in (1037.7 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Last update 28 Mar 5:51 am CDT
Extended Forecast for

McHenry IL

  • Today

    Today: Sunny, with a high near 48. North wind 5 to 10 mph becoming south southwest 10 to 15 mph in the morning. Winds could gust as high as 25 mph.

    High: 48 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 36. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 36 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Partly sunny, with a high near 62. South southwest wind around 15 mph, with gusts as high as 25 mph.

    High: 62 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 45. South southwest wind around 10 mph, with gusts as high as 15 mph.

    Low: 45 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 74. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 74 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 59.

    Low: 59 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 76. Breezy. Chance of precipitation is 70%.

    High: 76 °F

    Breezy.
    Chance
    Showers then
    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A chance of showers. Mostly cloudy, with a low around 36.

    Low: 36 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Partly sunny, with a high near 46.

    High: 46 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 48. North wind 5 to 10 mph becoming south southwest 10 to 15 mph in the morning. Winds could gust as high as 25 mph.
Tonight
Increasing clouds, with a low around 36. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday
Partly sunny, with a high near 62. South southwest wind around 15 mph, with gusts as high as 25 mph.
Sunday Night
Partly cloudy, with a low around 45. South southwest wind around 10 mph, with gusts as high as 15 mph.
Monday
Mostly sunny, with a high near 74. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 59.
Tuesday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 76. Breezy. Chance of precipitation is 70%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 36.
Wednesday
Partly sunny, with a high near 46.
Wednesday Night
Partly cloudy, with a low around 30.
Thursday
A chance of showers. Mostly sunny, with a high near 46.
Thursday Night
A chance of showers. Partly cloudy, with a low around 35.
Friday
Mostly sunny, with a high near 56.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
3:50 am CDT Mar 28, 2026
Forecast Valid:
6am CDT Mar 28, 2026-6pm CDT Apr 3, 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