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.

Partly Cloudy

62°F

17°C

Humidity 22%
Wind Speed SW 15 mph
Barometer 30.07 in (1018.3 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Last update 29 Mar 2:51 pm CDT
Extended Forecast for

McHenry IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 63. South southwest wind around 15 mph, with gusts as high as 25 mph.

    High: 63 °F

    Mostly Cloudy

  • Tonight

    Tonight: Partly cloudy, with a low around 46. South southwest wind around 10 mph, with gusts as high as 15 mph.

    Low: 46 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 73. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 73 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Increasing clouds, with a low around 61. East southeast wind 10 to 15 mph becoming southwest after midnight. Winds could gust as high as 20 mph.

    Low: 61 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 74. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 80%.

    High: 74 °F

    Showers and
    Breezy

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 10pm, then showers likely. Low around 36. Chance of precipitation is 80%.

    Low: 36 °F

    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 42.

    High: 42 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Showers likely, mainly after 1am. Cloudy, with a low around 33. Breezy.

    Low: 33 °F

    Showers
    Likely and
    Breezy

  • Thursday

    Thursday: Showers likely. Cloudy, with a high near 47. Breezy.

    High: 47 °F

    Showers
    Likely and
    Breezy

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 63. South southwest wind around 15 mph, with gusts as high as 25 mph.
Tonight
Partly cloudy, with a low around 46. South southwest wind around 10 mph, with gusts as high as 15 mph.
Monday
Mostly sunny, with a high near 73. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Monday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Increasing clouds, with a low around 61. East southeast wind 10 to 15 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
Tuesday
Showers and possibly a thunderstorm. High near 74. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 80%.
Tuesday Night
Showers and possibly a thunderstorm before 10pm, then showers likely. Low around 36. Chance of precipitation is 80%.
Wednesday
A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 42.
Wednesday Night
Showers likely, mainly after 1am. Cloudy, with a low around 33. Breezy.
Thursday
Showers likely. Cloudy, with a high near 47. Breezy.
Thursday Night
Showers likely, mainly before 1am. Cloudy, with a low around 35.
Friday
Mostly cloudy, with a high near 52.
Friday Night
A chance of showers. Mostly cloudy, with a low around 39.
Saturday
Showers likely. Cloudy, with a high near 64.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
3:41 pm CDT Mar 29, 2026
Forecast Valid:
3pm CDT Mar 29, 2026-6pm CDT Apr 4, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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