National Weather Service Forecast for: Decatur IL
Issued by: National Weather Service Lincoln, IL
Updated: 3:36 am CST Dec 5, 2025
 
Today

Today: Patchy freezing fog before 9am. Partly sunny, then gradually becoming sunny, with a high near 30. Wind chill values between -3 and 7. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 17 mph.
Patchy
Freezing Fog
then Sunny
 Tonight

Tonight: Increasing clouds, with a low around 24. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 17 mph.
Increasing
Clouds
 Saturday

Saturday: Mostly cloudy, with a high near 32. West northwest wind around 6 mph becoming light and variable in the afternoon.
Mostly Cloudy

 Saturday
Night
Saturday Night: Snow likely after midnight. Mostly cloudy, with a low around 23. East southeast wind 3 to 8 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Mostly Cloudy
then Snow
Likely
 Sunday

Sunday: Snow likely before noon. Mostly cloudy, with a high near 32. East southeast wind 8 to 13 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Snow Likely
then Mostly
Cloudy
 Sunday
Night
Sunday Night: Mostly cloudy, with a low around 5. North wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 16 mph.
Mostly Cloudy

 Monday

Monday: Mostly sunny, with a high near 24. Calm wind becoming south around 6 mph in the afternoon.
Mostly Sunny

 Monday
Night
Monday Night: Mostly cloudy, with a low around 16.
Mostly Cloudy

 Tuesday

Tuesday: Partly sunny, with a high near 36.
Partly Sunny
Hi 30 °F Lo 24 °F Hi 32 °F Lo 23 °F Hi 32 °F Lo 5 °F Hi 24 °F Lo 16 °F Hi 36 °F

Hazardous Weather Outlook
 

Today
 
 Patchy freezing fog before 9am. Partly sunny, then gradually becoming sunny, with a high near 30. Wind chill values between -3 and 7. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 17 mph.
Tonight
 
 Increasing clouds, with a low around 24. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 17 mph.
Saturday
 
 Mostly cloudy, with a high near 32. West northwest wind around 6 mph becoming light and variable in the afternoon.
Saturday Night
 
 Snow likely after midnight. Mostly cloudy, with a low around 23. East southeast wind 3 to 8 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Sunday
 
 Snow likely before noon. Mostly cloudy, with a high near 32. East southeast wind 8 to 13 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Sunday Night
 
 Mostly cloudy, with a low around 5. North wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 16 mph.
Monday
 
 Mostly sunny, with a high near 24. Calm wind becoming south around 6 mph in the afternoon.
Monday Night
 
 Mostly cloudy, with a low around 16.
Tuesday
 
 Partly sunny, with a high near 36.
Tuesday Night
 
 A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 30.
Wednesday
 
 A chance of rain. Mostly cloudy, with a high near 38.
Wednesday Night
 
 Mostly cloudy, with a low around 15.
Thursday
 
 Partly sunny, with a high near 27.

 

Forecast from NOAA-NWS for Decatur IL.