National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

41°F

5°C

Humidity 57%
Wind Speed N 7 mph
Barometer 30.09 in (1019.1 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 28 Feb 7:54 am CST
Extended Forecast for

Decatur IL

  • Today

    Today: Partly sunny, with a high near 55. East wind 8 to 10 mph.

    High: 55 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 25. North wind 8 to 14 mph, with gusts as high as 21 mph.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 39. North northeast wind 9 to 13 mph, with gusts as high as 21 mph.

    High: 39 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Snow likely, mainly before midnight. Cloudy, with a low around 27. East northeast wind around 10 mph, with gusts as high as 17 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.

    Low: 27 °F

    Snow Likely

  • Monday

    Monday: Mostly cloudy, with a high near 42. East southeast wind 9 to 11 mph, with gusts as high as 20 mph.

    High: 42 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Rain, mainly after midnight. Low around 35. Southeast wind around 10 mph, with gusts as high as 17 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 35 °F

    Chance Rain
    then Rain

  • Tuesday

    Tuesday: Rain. High near 51. South southeast wind around 10 mph becoming west northwest in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 51 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain, mainly before midnight. Low around 42. Chance of precipitation is 80%.

    Low: 42 °F

    Rain then
    Chance Rain

  • Wednesday

    Wednesday: Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 59. Chance of precipitation is 70%.

    High: 59 °F

    Rain Likely

Detailed Forecast

Today
Partly sunny, with a high near 55. East wind 8 to 10 mph.
Tonight
Partly cloudy, with a low around 25. North wind 8 to 14 mph, with gusts as high as 21 mph.
Sunday
Partly sunny, with a high near 39. North northeast wind 9 to 13 mph, with gusts as high as 21 mph.
Sunday Night
Snow likely, mainly before midnight. Cloudy, with a low around 27. East northeast wind around 10 mph, with gusts as high as 17 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.
Monday
Mostly cloudy, with a high near 42. East southeast wind 9 to 11 mph, with gusts as high as 20 mph.
Monday Night
Rain, mainly after midnight. Low around 35. Southeast wind around 10 mph, with gusts as high as 17 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
Rain. High near 51. South southeast wind around 10 mph becoming west northwest in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Tuesday Night
Rain, mainly before midnight. Low around 42. Chance of precipitation is 80%.
Wednesday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 59. Chance of precipitation is 70%.
Wednesday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 47. Chance of precipitation is 60%.
Thursday
A chance of rain. Mostly cloudy, with a high near 63.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 51.
Friday
Rain likely. Mostly cloudy, with a high near 67.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
5:56 am CST Feb 28, 2026
Forecast Valid:
8am CST Feb 28, 2026-6pm CST Mar 6, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation