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.

A Few Clouds

61°F

16°C

Humidity 24%
Wind Speed SW 18 G 23 mph
Barometer 30.12 in (1020.3 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Last update 29 Mar 12:51 pm CDT
Extended Forecast for

McHenry IL

  • This Afternoon

    This Afternoon: 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

  • Tonight

    Tonight: Partly cloudy, with a low around 46. South southwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 46 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 75. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 75 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 59. South southeast wind 10 to 15 mph becoming southwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 50%.

    Low: 59 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 74. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 70%.

    High: 74 °F

    Breezy.
    Chance
    Showers then
    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 35. Chance of precipitation is 50%.

    Low: 35 °F

    Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 43.

    High: 43 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 31.

    Low: 31 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of rain and snow showers before 1pm, then a chance of rain showers. Mostly cloudy, with a high near 43. Breezy.

    High: 43 °F

    Chance
    Rain/Snow and
    Breezy

Detailed Forecast

This Afternoon
Partly sunny, with a high near 62. 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 20 mph.
Monday
Mostly sunny, with a high near 75. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 59. South southeast wind 10 to 15 mph becoming southwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 50%.
Tuesday
A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 74. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 70%.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 35. Chance of precipitation is 50%.
Wednesday
A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 43.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 31.
Thursday
A chance of rain and snow showers before 1pm, then a chance of rain showers. Mostly cloudy, with a high near 43. Breezy.
Thursday Night
A chance of showers. Cloudy, with a low around 36.
Friday
Mostly cloudy, with a high near 54.
Friday Night
A chance of showers. Mostly cloudy, with a low around 41.
Saturday
Showers likely. Mostly cloudy, with a high near 61.
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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:
10:37 am CDT Mar 29, 2026
Forecast Valid:
1pm CDT Mar 29, 2026-6pm CDT Apr 4, 2026
 
Forecast Discussion
 
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Additional Resources

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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