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

51°F

11°C

Humidity 54%
Wind Speed SW 16 mph
Barometer 29.71 in (1005.7 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 9 Mar 2:51 am CDT
Extended Forecast for

McHenry IL

  • Overnight

    Overnight: Mostly clear, with a low around 46. Southwest wind around 15 mph, with gusts as high as 25 mph.

    Low: 46 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 70. Southwest wind around 15 mph, with gusts as high as 25 mph.

    High: 70 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 46. West southwest wind 5 to 10 mph becoming northeast after midnight.

    Low: 46 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 56. East northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 56 °F

    Partly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 36. Northeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 100%.

    Low: 36 °F

    Showers

  • Wednesday

    Wednesday: Rain likely before 4pm, then a chance of rain and snow. Cloudy, with a high near 42. Breezy. Chance of precipitation is 60%.

    High: 42 °F

    Rain Likely
    then
    Rain/Snow
    Likely and
    Breezy

  • Wednesday Night

    Wednesday Night: A chance of rain and snow before 7pm. Partly cloudy, with a low around 26. Chance of precipitation is 30%.

    Low: 26 °F

    Chance
    Rain/Snow
    then Mostly
    Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 45.

    High: 45 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Rain likely, mainly after 1am. Mostly cloudy, with a low around 36. Breezy.

    Low: 36 °F

    Rain Likely
    and Breezy

Detailed Forecast

Overnight
Mostly clear, with a low around 46. Southwest wind around 15 mph, with gusts as high as 25 mph.
Monday
Sunny, with a high near 70. Southwest wind around 15 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 46. West southwest wind 5 to 10 mph becoming northeast after midnight.
Tuesday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 56. East northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
Showers and possibly a thunderstorm. Low around 36. Northeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 100%.
Wednesday
Rain likely before 4pm, then a chance of rain and snow. Cloudy, with a high near 42. Breezy. Chance of precipitation is 60%.
Wednesday Night
A chance of rain and snow before 7pm. Partly cloudy, with a low around 26. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 45.
Thursday Night
Rain likely, mainly after 1am. Mostly cloudy, with a low around 36. Breezy.
Friday
Partly sunny, with a high near 47. Breezy.
Friday Night
Mostly cloudy, with a low around 28.
Saturday
A chance of snow. Cloudy, with a high near 44.
Saturday Night
A chance of rain and snow. Cloudy, with a low around 33.
Sunday
Rain and snow likely. Cloudy, with a high near 46.
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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:
3:36 am CDT Mar 9, 2026
Forecast Valid:
3am CDT Mar 9, 2026-6pm CDT Mar 15, 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