National Weather Service Forecast for: De Kalb IL
Issued by: National Weather Service Chicago, IL
Updated: 9:36 am CDT Oct 6, 2026
 
This
Afternoon
This Afternoon: Sunny, with a high near 74. South southwest wind around 15 mph, with gusts as high as 30 mph.
Sunny
 Tonight

Tonight: Partly cloudy, with a low around 54. South southwest wind around 10 mph, with gusts as high as 20 mph.
Partly Cloudy
 Wednesday

Wednesday: Sunny, with a high near 75. West northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Sunny
 Wednesday
Night
Wednesday Night: Cloudy during the early evening, then gradual clearing, with a low around 48. West northwest wind around 5 mph, with gusts as high as 10 mph.
Gradual
Clearing
 Thursday

Thursday: Mostly sunny, with a high near 68. Northwest wind 5 to 10 mph.
Mostly Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 45.
Mostly Clear
 Friday

Friday: Sunny, with a high near 70.
Sunny
 Friday
Night
Friday Night: Mostly clear, with a low around 51.
Mostly Clear
 Saturday

Saturday: Sunny, with a high near 77.
Sunny
Hi 74 °F Lo 54 °F Hi 75 °F Lo 48 °F Hi 68 °F Lo 45 °F Hi 70 °F Lo 51 °F Hi 77 °F

 

This Afternoon
 
 Sunny, with a high near 74. South southwest wind around 15 mph, with gusts as high as 30 mph.
Tonight
 
 Partly cloudy, with a low around 54. South southwest wind around 10 mph, with gusts as high as 20 mph.
Wednesday
 
 Sunny, with a high near 75. West northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Wednesday Night
 
 Cloudy during the early evening, then gradual clearing, with a low around 48. West northwest wind around 5 mph, with gusts as high as 10 mph.
Thursday
 
 Mostly sunny, with a high near 68. Northwest wind 5 to 10 mph.
Thursday Night
 
 Mostly clear, with a low around 45.
Friday
 
 Sunny, with a high near 70.
Friday Night
 
 Mostly clear, with a low around 51.
Saturday
 
 Sunny, with a high near 77.
Saturday Night
 
 Partly cloudy, with a low around 57.
Sunday
 
 Mostly sunny, with a high near 79.
Sunday Night
 
 Mostly clear, with a low around 55.
Columbus Day
 
 Mostly sunny, with a high near 75.

 

Forecast from NOAA-NWS for De Kalb IL.