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

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Light Snow Fog/Mist

25°F

-4°C

Humidity 92%
Wind Speed SE 3 mph
Barometer 30.14 in (1021.6 mb)
Dewpoint 23°F (-5°C)
Visibility 2.00 mi
Last update 1 Dec 4:54 pm CST
Extended Forecast for

Decatur IL

Winter Weather Advisory until December 2, 06:00am
Click here for hazard details and duration
Winter Weather Advisory
  •  
    Winter Weather Advisory until December 2, 06:00am

    NOW until 6:00am Tue

    Winter Weather Advisory

  • This Afternoon

    High: 27 °F

    Snow

  • Tonight

    Tonight: Snow, mainly before 1am. Low around 15. Calm wind becoming west northwest 5 to 7 mph after midnight. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

    Low: 15 °F

    Snow then
    Chance Snow

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 23. Northwest wind 5 to 7 mph becoming light and variable in the afternoon.

    High: 23 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 16. South wind 5 to 9 mph, with gusts as high as 15 mph.

    Low: 16 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 34. South wind 7 to 10 mph becoming west in the afternoon. Winds could gust as high as 16 mph.

    High: 34 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Cloudy, then gradually becoming partly cloudy, with a low around 4. North northwest wind 7 to 10 mph, with gusts as high as 16 mph.

    Low: 4 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 13. North northwest wind 5 to 10 mph becoming light north northeast in the afternoon. Winds could gust as high as 15 mph.

    High: 13 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around -2.

    Low: -2 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
Snow. High near 27. Light east southeast wind. Chance of precipitation is 100%. Total daytime snow accumulation of 1 to 3 inches possible.
Tonight
Snow, mainly before 1am. Low around 15. Calm wind becoming west northwest 5 to 7 mph after midnight. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.
Tuesday
Mostly cloudy, with a high near 23. Northwest wind 5 to 7 mph becoming light and variable in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 16. South wind 5 to 9 mph, with gusts as high as 15 mph.
Wednesday
Mostly cloudy, with a high near 34. South wind 7 to 10 mph becoming west in the afternoon. Winds could gust as high as 16 mph.
Wednesday Night
Cloudy, then gradually becoming partly cloudy, with a low around 4. North northwest wind 7 to 10 mph, with gusts as high as 16 mph.
Thursday
Sunny, with a high near 13. North northwest wind 5 to 10 mph becoming light north northeast in the afternoon. Winds could gust as high as 15 mph.
Thursday Night
Partly cloudy, with a low around -2.
Friday
Mostly sunny, with a high near 29.
Friday Night
Mostly cloudy, with a low around 20.
Saturday
Mostly cloudy, with a high near 31.
Saturday Night
Mostly cloudy, with a low around 20.
Sunday
Mostly cloudy, with a high near 30.
Sunday Night
Mostly cloudy, with a low around 11.
Monday
Partly sunny, with a high near 29.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
4:46 pm CST Dec 1, 2025
Forecast Valid:
5pm CST Dec 1, 2025-6pm CST Dec 8, 2025
 
Forecast Discussion
 
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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