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.

Overcast

23°F

-5°C

Humidity 78%
Wind Speed W 15 G 22 mph
Barometer 30.40 in (1030.3 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill10°F (-12°C)
Last update 30 Nov 3:54 pm CST
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: Scattered flurries. Cloudy, with a high near 26. West northwest wind around 10 mph, with gusts as high as 21 mph.

    High: 26 °F

    Scattered
    Flurries

  • Tonight

    Tonight: Mostly cloudy, with a low around 14. West northwest wind 5 to 10 mph becoming light and variable in the evening.

    Low: 14 °F

    Mostly Cloudy

  • Monday

    Monday: Snow, mainly after 3pm. High near 29. Calm wind becoming southeast around 6 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    High: 29 °F

    Cloudy then
    Snow

  • Monday Night

    Monday Night: Snow, mainly before midnight. Low around 17. Calm wind becoming northwest 5 to 7 mph after midnight. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

    Low: 17 °F

    Snow then
    Chance Snow

  • Tuesday

    Tuesday: Partly sunny, with a high near 25. Northwest wind around 6 mph becoming southwest in the afternoon.

    High: 25 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 16. South wind 5 to 9 mph.

    Low: 16 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 34. South southwest wind 7 to 10 mph, with gusts as high as 16 mph.

    High: 34 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 7.

    Low: 7 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 15.

    High: 15 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Scattered flurries. Cloudy, with a high near 26. West northwest wind around 10 mph, with gusts as high as 21 mph.
Tonight
Mostly cloudy, with a low around 14. West northwest wind 5 to 10 mph becoming light and variable in the evening.
Monday
Snow, mainly after 3pm. High near 29. Calm wind becoming southeast around 6 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Monday Night
Snow, mainly before midnight. Low around 17. Calm wind becoming northwest 5 to 7 mph after midnight. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.
Tuesday
Partly sunny, with a high near 25. Northwest wind around 6 mph becoming southwest in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 16. South wind 5 to 9 mph.
Wednesday
Partly sunny, with a high near 34. South southwest wind 7 to 10 mph, with gusts as high as 16 mph.
Wednesday Night
Mostly cloudy, with a low around 7.
Thursday
Mostly sunny, with a high near 15.
Thursday Night
Mostly cloudy, with a low around 0.
Friday
A chance of snow. Mostly cloudy, with a high near 27.
Friday Night
A chance of snow. Mostly cloudy, with a low around 20.
Saturday
Mostly cloudy, with a high near 31.
Saturday Night
Mostly cloudy, with a low around 22.
Sunday
Mostly cloudy, with a high near 31.
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:
3:16 pm CST Nov 30, 2025
Forecast Valid:
4pm CST Nov 30, 2025-6pm CST Dec 7, 2025
 
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