National Weather Service Forecast for: De Kalb IL
Issued by: National Weather Service Chicago, IL
Updated: 1:41 pm CDT May 28, 2025
 
This
Afternoon
This Afternoon: Isolated showers. Mostly cloudy, with a high near 62. North wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.
Isolated
Showers

 Tonight

Tonight: Isolated showers before 8pm. Mostly cloudy, with a low around 50. North northeast wind around 5 mph becoming west northwest after midnight. Chance of precipitation is 20%.
Isolated
Showers then
Mostly Cloudy
 Thursday

Thursday: Isolated showers after 1pm. Mostly cloudy, with a high near 71. Northwest wind 5 to 10 mph. Chance of precipitation is 20%.
Mostly Cloudy
then Isolated
Showers
 Thursday
Night
Thursday Night: Partly cloudy, with a low around 52. North northwest wind around 5 mph.
Partly Cloudy

 Friday

Friday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 78. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Mostly Sunny
then Slight
Chance
Showers
 Friday
Night
Friday Night: Partly cloudy, with a low around 56.
Partly Cloudy

 Saturday

Saturday: Sunny, with a high near 77.
Sunny

 Saturday
Night
Saturday Night: Partly cloudy, with a low around 50.
Partly Cloudy

 Sunday

Sunday: Sunny, with a high near 78.
Sunny
Hi 62 °F Lo 50 °F Hi 71 °F Lo 52 °F Hi 78 °F Lo 56 °F Hi 77 °F Lo 50 °F Hi 78 °F

 

This Afternoon
 
 Isolated showers. Mostly cloudy, with a high near 62. North wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.
Tonight
 
 Isolated showers before 8pm. Mostly cloudy, with a low around 50. North northeast wind around 5 mph becoming west northwest after midnight. Chance of precipitation is 20%.
Thursday
 
 Isolated showers after 1pm. Mostly cloudy, with a high near 71. Northwest wind 5 to 10 mph. Chance of precipitation is 20%.
Thursday Night
 
 Partly cloudy, with a low around 52. North northwest wind around 5 mph.
Friday
 
 A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 78. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night
 
 Partly cloudy, with a low around 56.
Saturday
 
 Sunny, with a high near 77.
Saturday Night
 
 Partly cloudy, with a low around 50.
Sunday
 
 Sunny, with a high near 78.
Sunday Night
 
 Mostly clear, with a low around 56.
Monday
 
 Sunny, with a high near 86.
Monday Night
 
 Mostly clear, with a low around 64.
Tuesday
 
 Mostly sunny, with a high near 86.
Tuesday Night
 
 Mostly cloudy, with a low around 68.
Wednesday
 
 A chance of showers. Partly sunny, with a high near 86.

 

Forecast from NOAA-NWS for De Kalb IL.