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December 18th, 2025 :: 10:52 am CST   

Local Weather Report for
Dekalb
Illinois, United States

 Current Dekalb Weather Conditions Updated December 18th at 9:55 am 
moderate rain
Temperature:41°F Dew Point:41°F
Barometer:29.42 inHg Wind:N 32 Mph
Humidity:100.0% Visibility:n/a
 
 Dekalb Weather Forecast Summary  
 
Today
Dec 18th
Friday
Dec 19th
Saturday
Dec 20th
Sunday
Dec 21st
Monday
Dec 22nd
Mix of rain and snow Cloudy Cloudy Cloudy Cloudy
48°F
25°F
14°F
39°F
23°F
23°F
16°F
32°F
23°F
 
 Dekalb Detailed Weather Forecast  
 
Thursday, December 18th, 2025
Morning Temperature: 43°F
Cloudy with showers. Showers possibly mixed with wet flurries. Wind 20 to 30 mph.
Afternoon Temperature: 30°F
Cloudy with sunny periods with a few flurries. Windy.
Evening Temperature: 20°F
Cloudy. Windy.
Friday, December 19th, 2025
Overnight Temperature: 15°F
Cloudy. Wind 20 to 30 mph.
Morning Temperature: 19°F
Sunny. Windy.
Afternoon Temperature: 23°F
Cloudy.
Evening Temperature: 24°F
Cloudy. Windy at times.
Saturday, December 20th, 2025
Overnight Temperature: 29°F
Cloudy. Windy.
Morning Temperature: 36°F
Cloudy with a chance of showers. Showers possibly mixed with wet flurries. Windy.
Afternoon Temperature: 30°F
Sunny. Windy at times.
Evening Temperature: 27°F
Clear. Windy.
Sunday, December 21st, 2025
Overnight Temperature: 16°F
Clear. Windy.
Morning Temperature: 20°F
Sunny. Windy at times.
Afternoon Temperature: 21°F
Sunny.
Evening Temperature: 20°F
Cloudy.
Monday, December 22nd, 2025
Overnight Temperature: 24°F
Cloudy with a chance of flurries. Windy at times.
Morning Temperature: 29°F
Cloudy. Windy at times.
Afternoon Temperature: 31°F
Cloudy. Windy.
Evening Temperature: 31°F
Cloudy. Windy at times.
Tuesday, December 23rd, 2025
Overnight Temperature: 31°F
Cloudy. Windy at times.
Morning Temperature: 38°F
Cloudy.
Afternoon Temperature: 37°F
Cloudy.
Evening Temperature: 33°F
Cloudy.
Wednesday, December 24th, 2025
Overnight Temperature: 35°F
Cloudy.
Morning Temperature: 39°F
Cloudy with a chance of showers. Showers possibly mixed with wet flurries.
Afternoon Temperature: 43°F
Cloudy with a chance of showers.
Evening Temperature: 45°F
Cloudy with a slight chance of showers.
Thursday, December 25th, 2025
Overnight Temperature: 42°F
Cloudy.
Morning Temperature: 41°F
Cloudy.
Afternoon Temperature: 41°F
Cloudy.
Evening Temperature: 41°F
Cloudy with a chance of showers. Windy at times.
Friday, December 26th, 2025
Overnight Temperature: 38°F
Cloudy. Windy at times.
Morning Temperature: 34°F
Cloudy. Windy at times.
Afternoon Temperature: 29°F
Cloudy. Windy at times.
Evening Temperature: 27°F
Cloudy. Windy at times.





 

  [ Local Weather Report ]
De Kalb, IL 
9:55 AM  41°F
moderate rain
 
Sycamore, IL 
9:55 AM  41°F
moderate rain
 
Genoa, IL 
 
Rochelle, IL 
 
Sandwich, IL 
 
Plano, IL 
 
Batavia, IL 
9:52 AM  46°F
mist
 
Geneva, IL 
9:52 AM  46°F
mist
 
Marengo, IL 
 
Belvidere, IL 

 
This WeatherCity Weather Forecast for Dekalb, Illinois, United States is computed using a computer-generated forecast model and should be considered experimental. Please confirm this weather information with your official weather information office

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