National Weather Service

News Headlines

December 28, 2025: Rare December Severe Weather Outbreak With Multiple Tornadoes in Central Illinois

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

17°F

-8°C

Humidity	62%
Wind Speed	N 8 G 21 mph
Barometer	29.95 in (1015.9 mb)
Dewpoint	6°F (-14°C)
Visibility	10.00 mi
Wind Chill	7°F (-14°C)
Last update	31 Dec 9:51 pm CST

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

McHenry IL

Tonight
Low: 8 °F
Chance
Flurries
New Year's Day
High: 19 °F
Partly Sunny
then Slight
Chance Snow
Thursday Night
Low: 12 °F
Mostly Cloudy
Friday
High: 25 °F
Sunny
Friday Night
Low: 15 °F
Mostly Cloudy
Saturday
High: 28 °F
Mostly Cloudy
Saturday Night
Low: 12 °F
Mostly Clear
Sunday
High: 27 °F
Partly Sunny
Sunday Night
Low: 23 °F
Mostly Cloudy

Detailed Forecast

Tonight

A chance of flurries before midnight. Partly cloudy, with a low around 8. Wind chill values as low as zero. North northwest wind 5 to 15 mph, with gusts as high as 20 mph.

New Year's Day

A 20 percent chance of snow after noon. Mostly cloudy, with a high near 19. Wind chill values as low as -2. West northwest wind 5 to 10 mph.

Thursday Night

Mostly cloudy, with a low around 12. West wind around 5 mph.

Friday

Sunny, with a high near 25. Northwest wind around 5 mph, with gusts as high as 10 mph.

Friday Night

Mostly cloudy, with a low around 15. Northwest wind around 5 mph becoming calm.

Saturday

Mostly cloudy, with a high near 28.

Saturday Night

Mostly clear, with a low around 12.