NWS Forecast for De Kalb IL

National Weather Service Forecast for: De Kalb IL
Issued by: National Weather Service Chicago, IL

Updated: 2:41 pm CST Feb 2, 2026

Tonight Mostly Cloudy then Chance Snow	Tuesday Sunny	Tuesday Night Partly Cloudy	Wednesday Sunny	Wednesday Night Partly Cloudy	Thursday Mostly Cloudy	Thursday Night Mostly Cloudy then Slight Chance Snow	Friday Partly Sunny	Friday Night Partly Cloudy
Lo 15 °F	Hi 24 °F	Lo 7 °F	Hi 26 °F	Lo 13 °F	Hi 33 °F	Lo 27 °F	Hi 37 °F	Lo 12 °F

Hazardous Weather Outlook

Tonight	A chance of snow between midnight and 4am. Mostly cloudy, with a low around 15. Northwest wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 30%.
Tuesday	Sunny, with a high near 24. North wind 5 to 10 mph.
Tuesday Night	Partly cloudy, with a low around 7. North wind around 5 mph becoming calm in the evening. Winds could gust as high as 10 mph.
Wednesday	Sunny, with a high near 26. Wind chill values as low as 1. Northwest wind around 5 mph, with gusts as high as 10 mph.
Wednesday Night	Partly cloudy, with a low around 13. West northwest wind around 5 mph.
Thursday	Mostly cloudy, with a high near 33.
Thursday Night	A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 27.
Friday	Partly sunny, with a high near 37.
Friday Night	Partly cloudy, with a low around 12.
Saturday	Mostly sunny, with a high near 28.
Saturday Night	Partly cloudy, with a low around 13.
Sunday	Mostly sunny, with a high near 32.
Sunday Night	Partly cloudy, with a low around 17.
Monday	Mostly sunny, with a high near 36.

Forecast from NOAA-NWS for De Kalb IL.