National Weather Service Forecast for: De Kalb IL
Issued by: National Weather Service Chicago, IL
Updated: 5:57 am CDT Jun 12, 2025
 
Today

Today: A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 87. East southeast wind 5 to 10 mph.
Partly Sunny
then Slight
Chance
T-storms
 Tonight

Tonight: A 10 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 61. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Slight Chance
T-storms then
Mostly Cloudy
 Friday

Friday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 82. Southeast wind 5 to 10 mph. Chance of precipitation is 50%.
Chance
Showers

 Friday
Night
Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. East wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 30%.
Chance
Showers

 Saturday

Saturday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. East northeast wind 5 to 10 mph. Chance of precipitation is 30%.
Chance
Showers

 Saturday
Night
Saturday Night: Partly cloudy, with a low around 59.
Partly Cloudy

 Sunday

Sunday: Partly sunny, with a high near 81.
Partly Sunny

 Sunday
Night
Sunday Night: Mostly cloudy, with a low around 59.
Mostly Cloudy

 Monday

Monday: A chance of showers after 1pm. Mostly sunny, with a high near 85.
Mostly Sunny
then Chance
Showers
Hi 87 °F Lo 61 °F Hi 82 °F Lo 63 °F Hi 81 °F Lo 59 °F Hi 81 °F Lo 59 °F Hi 85 °F

Hazardous Weather Outlook
 

Today
 
 A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 87. East southeast wind 5 to 10 mph.
Tonight
 
 A 10 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 61. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Friday
 
 A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 82. Southeast wind 5 to 10 mph. Chance of precipitation is 50%.
Friday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. East wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 30%.
Saturday
 
 A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. East northeast wind 5 to 10 mph. Chance of precipitation is 30%.
Saturday Night
 
 Partly cloudy, with a low around 59.
Sunday
 
 Partly sunny, with a high near 81.
Sunday Night
 
 Mostly cloudy, with a low around 59.
Monday
 
 A chance of showers after 1pm. Mostly sunny, with a high near 85.
Monday Night
 
 A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 64.
Tuesday
 
 A chance of showers and thunderstorms. Partly sunny, with a high near 86.
Tuesday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Wednesday
 
 A chance of showers and thunderstorms. Partly sunny, with a high near 87.

 

Forecast from NOAA-NWS for De Kalb IL.