National Weather Service Forecast for: Decatur IL
Issued by: National Weather Service Lincoln, IL
Updated: 5:37 am CST Feb 2, 2026
 
Today

Today: Mostly cloudy, with a high near 30. West wind 3 to 8 mph.
Mostly Cloudy

Tonight

Tonight: A 20 percent chance of snow after 3am.  Mostly cloudy, with a low around 20. Light and variable wind.
Mostly Cloudy
then Slight
Chance Snow
Tuesday

Tuesday: A 40 percent chance of snow before noon.  Mostly cloudy, with a high near 29. North wind 5 to 8 mph.
Chance Snow
then Partly
Sunny
Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 10. North northeast wind 3 to 6 mph.
Partly Cloudy

Wednesday

Wednesday: Mostly sunny, with a high near 25. Light and variable wind becoming north northwest around 5 mph.
Mostly Sunny

Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 9. West wind 3 to 5 mph.
Partly Cloudy

Thursday

Thursday: Partly sunny, with a high near 33. South southwest wind 5 to 10 mph, with gusts as high as 16 mph.
Partly Sunny

Thursday
Night
Thursday Night: Partly cloudy, with a low around 26.
Partly Cloudy

Friday

Friday: Partly sunny, with a high near 38.
Partly Sunny

Hi 30 °F Lo 20 °F Hi 29 °F Lo 10 °F Hi 25 °F Lo 9 °F Hi 33 °F Lo 26 °F Hi 38 °F

Hazardous Weather Outlook
 

Today
 
Mostly cloudy, with a high near 30. West wind 3 to 8 mph.
Tonight
 
A 20 percent chance of snow after 3am. Mostly cloudy, with a low around 20. Light and variable wind.
Tuesday
 
A 40 percent chance of snow before noon. Mostly cloudy, with a high near 29. North wind 5 to 8 mph.
Tuesday Night
 
Partly cloudy, with a low around 10. North northeast wind 3 to 6 mph.
Wednesday
 
Mostly sunny, with a high near 25. Light and variable wind becoming north northwest around 5 mph.
Wednesday Night
 
Partly cloudy, with a low around 9. West wind 3 to 5 mph.
Thursday
 
Partly sunny, with a high near 33. South southwest wind 5 to 10 mph, with gusts as high as 16 mph.
Thursday Night
 
Partly cloudy, with a low around 26.
Friday
 
Partly sunny, with a high near 38.
Friday Night
 
Partly cloudy, with a low around 15.
Saturday
 
Mostly sunny, with a high near 28.
Saturday Night
 
Partly cloudy, with a low around 18.
Sunday
 
Mostly sunny, with a high near 34.

 

Forecast from NOAA-NWS for Decatur IL.