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

46°F

8°C

Humidity 71%
Wind Speed SW 7 mph
Barometer 29.93 in (1013.4 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 30 Mar 6:51 am CDT
Extended Forecast for

McHenry IL

  • Today

    Today: Mostly sunny, with a high near 75. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 75 °F

    Mostly Sunny

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 62. South wind 10 to 15 mph becoming west southwest after midnight. Winds could gust as high as 25 mph.

    Low: 62 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4pm. High near 73. Breezy, with a south southwest wind 15 to 20 mph becoming west in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 73 °F

    Breezy.
    Slight Chance
    T-storms then
    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 7pm, then a chance of showers and thunderstorms between 7pm and 1am, then a slight chance of showers after 1am. Low around 35. North wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.

    Low: 35 °F

    Showers then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of rain showers after 1pm, mixing with snow after 4pm. Mostly cloudy, with a high near 42. Breezy, with a northeast wind 15 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 42 °F

    Mostly Cloudy
    then Chance
    Rain/Snow and
    Breezy

  • Wednesday Night

    Wednesday Night: Rain, possibly mixed with snow showers, becoming all rain after 1am. Low around 34. Breezy. Chance of precipitation is 90%.

    Low: 34 °F

    Rain/Snow and
    Breezy

  • Thursday

    Thursday: Showers. High near 57. Chance of precipitation is 90%.

    High: 57 °F

    Showers

  • Thursday Night

    Thursday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 41.

    Low: 41 °F

    Showers
    Likely

  • Friday

    Friday: Mostly cloudy, with a high near 57.

    High: 57 °F

    Mostly Cloudy

Detailed Forecast

Today
Mostly sunny, with a high near 75. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 62. South wind 10 to 15 mph becoming west southwest after midnight. Winds could gust as high as 25 mph.
Tuesday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4pm. High near 73. Breezy, with a south southwest wind 15 to 20 mph becoming west in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
Showers and possibly a thunderstorm before 7pm, then a chance of showers and thunderstorms between 7pm and 1am, then a slight chance of showers after 1am. Low around 35. North wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Wednesday
A chance of rain showers after 1pm, mixing with snow after 4pm. Mostly cloudy, with a high near 42. Breezy, with a northeast wind 15 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Wednesday Night
Rain, possibly mixed with snow showers, becoming all rain after 1am. Low around 34. Breezy. Chance of precipitation is 90%.
Thursday
Showers. High near 57. Chance of precipitation is 90%.
Thursday Night
Showers likely, mainly before 1am. Mostly cloudy, with a low around 41.
Friday
Mostly cloudy, with a high near 57.
Friday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 39.
Saturday
Showers likely. Cloudy, with a high near 60.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 35.
Sunday
Mostly cloudy, with a high near 48.
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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:
5:21 am CDT Mar 30, 2026
Forecast Valid:
7am CDT Mar 30, 2026-6pm CDT Apr 5, 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