National Weather Service Forecast for: De Kalb IL
Issued by: National Weather Service Chicago, IL
Updated: 5:31 am CST Feb 2, 2026
 
Today

Today: Isolated flurries between 11am and 2pm. Partly sunny, with a high near 27. West northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Isolated
Flurries
 Tonight

Tonight: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 15. West northwest wind around 5 mph, with gusts as high as 10 mph.
Mostly Cloudy
then Slight
Chance Snow
 Tuesday

Tuesday: Mostly sunny, with a high near 23. North wind 5 to 10 mph.
Mostly Sunny

 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 7. Wind chill values as low as zero. North wind around 5 mph becoming calm after midnight. Winds could gust as high as 10 mph.
Mostly Clear

 Wednesday

Wednesday: Sunny, with a high near 25. West northwest wind around 5 mph, with gusts as high as 10 mph.
Sunny

 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 12.
Partly Cloudy

 Thursday

Thursday: Partly sunny, with a high near 32.
Partly Sunny

 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 30.
Mostly Cloudy

 Friday

Friday: Partly sunny, with a high near 33.
Partly Sunny
Hi 27 °F Lo 15 °F Hi 23 °F Lo 7 °F Hi 25 °F Lo 12 °F Hi 32 °F Lo 30 °F Hi 33 °F

 

Today
 
 Isolated flurries between 11am and 2pm. Partly sunny, with a high near 27. West northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Tonight
 
 A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 15. West northwest wind around 5 mph, with gusts as high as 10 mph.
Tuesday
 
 Mostly sunny, with a high near 23. North wind 5 to 10 mph.
Tuesday Night
 
 Mostly clear, with a low around 7. Wind chill values as low as zero. North wind around 5 mph becoming calm after midnight. Winds could gust as high as 10 mph.
Wednesday
 
 Sunny, with a high near 25. West northwest wind around 5 mph, with gusts as high as 10 mph.
Wednesday Night
 
 Partly cloudy, with a low around 12.
Thursday
 
 Partly sunny, with a high near 32.
Thursday Night
 
 Mostly cloudy, with a low around 30.
Friday
 
 Partly sunny, with a high near 33.
Friday Night
 
 Partly cloudy, with a low around 11.
Saturday
 
 Mostly sunny, with a high near 24.
Saturday Night
 
 Partly cloudy, with a low around 16.
Sunday
 
 Partly sunny, with a high near 30.

 

Forecast from NOAA-NWS for De Kalb IL.