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.

Fog/Mist

24°F

-4°C

Humidity 84%
Wind Speed E 8 mph
Barometer 30.36 in (1029.0 mb)
Dewpoint 20°F (-7°C)
Visibility 6.00 mi
Wind Chill15°F (-9°C)
Last update 1 Dec 9:54 am CST
Extended Forecast for

Decatur IL

Winter Weather Advisory December 1, 12:00pm until December 2, 06:00am
Click here for hazard details and duration
Winter Weather Advisory

  • Today

    Today: Snow, mainly after 2pm. High near 28. Southeast wind 3 to 6 mph. Chance of precipitation is 100%. Total daytime snow accumulation of 1 to 3 inches possible.

    High: 28 °F

    Cloudy then
    Snow

  • Tonight

    Tonight: Snow, mainly before midnight. Low around 17. 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: 17 °F

    Snow then
    Chance Snow

  • Tuesday

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

    High: 25 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 17. South wind 5 to 9 mph, with gusts as high as 15 mph.

    Low: 17 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 33. South southwest wind 6 to 10 mph, with gusts as high as 16 mph.

    High: 33 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 6. West wind 6 to 9 mph becoming north northwest after midnight. Winds could gust as high as 15 mph.

    Low: 6 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 15. North northwest wind 3 to 8 mph.

    High: 15 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 1.

    Low: 1 °F

    Mostly Cloudy

  • Friday

    Friday: A 30 percent chance of snow after noon. Mostly cloudy, with a high near 29.

    High: 29 °F

    Partly Sunny
    then Chance
    Snow

Detailed Forecast

Today
Snow, mainly after 2pm. High near 28. Southeast wind 3 to 6 mph. Chance of precipitation is 100%. Total daytime snow accumulation of 1 to 3 inches possible.
Tonight
Snow, mainly before midnight. Low around 17. 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 25. Northwest wind around 6 mph becoming southwest in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 17. South wind 5 to 9 mph, with gusts as high as 15 mph.
Wednesday
Mostly cloudy, with a high near 33. South southwest wind 6 to 10 mph, with gusts as high as 16 mph.
Wednesday Night
Mostly cloudy, with a low around 6. West wind 6 to 9 mph becoming north northwest after midnight. Winds could gust as high as 15 mph.
Thursday
Mostly sunny, with a high near 15. North northwest wind 3 to 8 mph.
Thursday Night
Mostly cloudy, with a low around 1.
Friday
A 30 percent chance of snow after noon. Mostly cloudy, with a high near 29.
Friday Night
Mostly cloudy, with a low around 21.
Saturday
Mostly cloudy, with a high near 32.
Saturday Night
Mostly cloudy, with a low around 21.
Sunday
Mostly cloudy, with a high near 31.
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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:
10:12 am CST Dec 1, 2025
Forecast Valid:
10am CST Dec 1, 2025-6pm CST Dec 7, 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