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.

Light Snow Fog/Mist

26°F

-3°C

Humidity 84%
Wind Speed NE 12 G 23 mph
Barometer 30.19 in (1023.8 mb)
Dewpoint 22°F (-6°C)
Visibility 2.50 mi
Wind Chill15°F (-9°C)
Last update 28 Feb 2:51 pm CST
Extended Forecast for

McHenry IL

  • This Afternoon

    This Afternoon: A 30 percent chance of snow. Partly sunny, with a high near 33. Northeast wind around 10 mph, with gusts as high as 15 mph.

    High: 33 °F

    Chance Snow

  • Tonight

    Tonight: Scattered flurries after midnight. Mostly cloudy, with a low around 21. North wind around 10 mph, with gusts as high as 15 mph.

    Low: 21 °F

    Scattered
    Flurries

  • Sunday

    Sunday: Mostly sunny, with a high near 32. North wind around 10 mph becoming east in the afternoon.

    High: 32 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 19. East wind around 5 mph, with gusts as high as 10 mph.

    Low: 19 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 42. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 42 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A slight chance of snow before 9pm, then rain likely, possibly mixed with snow. Mostly cloudy, with a low around 31. Chance of precipitation is 60%.

    Low: 31 °F

    Slight Chance
    Rain/Snow
    then
    Rain/Snow
    Likely

  • Tuesday

    Tuesday: Rain likely, mainly before noon. Cloudy, with a high near 43. Chance of precipitation is 70%.

    High: 43 °F

    Rain Likely

  • Tuesday Night

    Tuesday Night: A chance of rain before midnight. Mostly cloudy, with a low around 32.

    Low: 32 °F

    Chance Rain
    then Partly
    Cloudy

  • Wednesday

    Wednesday: A chance of rain. Mostly cloudy, with a high near 49.

    High: 49 °F

    Chance Rain

Detailed Forecast

This Afternoon
A 30 percent chance of snow. Partly sunny, with a high near 33. Northeast wind around 10 mph, with gusts as high as 15 mph.
Tonight
Scattered flurries after midnight. Mostly cloudy, with a low around 21. North wind around 10 mph, with gusts as high as 15 mph.
Sunday
Mostly sunny, with a high near 32. North wind around 10 mph becoming east in the afternoon.
Sunday Night
Partly cloudy, with a low around 19. East wind around 5 mph, with gusts as high as 10 mph.
Monday
Mostly sunny, with a high near 42. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
A slight chance of snow before 9pm, then rain likely, possibly mixed with snow. Mostly cloudy, with a low around 31. Chance of precipitation is 60%.
Tuesday
Rain likely, mainly before noon. Cloudy, with a high near 43. Chance of precipitation is 70%.
Tuesday Night
A chance of rain before midnight. Mostly cloudy, with a low around 32.
Wednesday
A chance of rain. Mostly cloudy, with a high near 49.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 38.
Thursday
A chance of rain. Mostly cloudy, with a high near 56.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 43.
Friday
Rain likely. Mostly cloudy, with a high near 62.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
McHenry IL
 42.34°N 88.26°W
Last Update:
1:46 pm CST Feb 28, 2026
Forecast Valid:
3pm CST Feb 28, 2026-6pm CST Mar 6, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation