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

31°F

-1°C

Humidity 92%
Wind Speed E 3 mph
Barometer 29.96 in (1015.1 mb)
Dewpoint 29°F (-2°C)
Visibility 6.00 mi
Last update 6 Dec 11:54 pm CST
Extended Forecast for

Decatur IL

Winter Weather Advisory until December 7, 06:00am
Click here for hazard details and duration
Winter Weather Advisory
  •  
    Winter Weather Advisory until December 7, 06:00am

    NOW until 6:00am Sun

    Winter Weather Advisory

  • Overnight

    Low: 29 °F

    Slight Chance
    Rain and
    Patchy Fog

  • Sunday

    Sunday: A 20 percent chance of rain before 9am. Areas of fog before 1pm. Otherwise, cloudy, with a high near 34. South wind 6 to 13 mph becoming north in the afternoon. Winds could gust as high as 22 mph.

    High: 34 °F

    Slight Chance
    Rain and
    Areas Fog
    then Patchy
    Fog

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 13. Wind chill values between 5 and 10. North northeast wind 5 to 11 mph, with gusts as high as 16 mph.

    Low: 13 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 26. North northeast wind around 5 mph becoming light and variable in the afternoon.

    High: 26 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a temperature falling to near 19 by 8pm, then rising to around 27 during the remainder of the night. South wind 5 to 14 mph, with gusts as high as 22 mph.

    Low: 19 °F⇑

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 42. South southwest wind around 14 mph, with gusts as high as 22 mph.

    High: 42 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 34. Southwest wind 14 to 18 mph, with gusts as high as 26 mph.

    Low: 34 °F

    Mostly Cloudy
    then Chance
    Rain

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 41.

    High: 41 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A slight chance of rain between 1am and 4am. Patchy fog. Otherwise, cloudy, with a low around 29. South southeast wind around 7 mph. Chance of precipitation is 20%.
Sunday
A 20 percent chance of rain before 9am. Areas of fog before 1pm. Otherwise, cloudy, with a high near 34. South wind 6 to 13 mph becoming north in the afternoon. Winds could gust as high as 22 mph.
Sunday Night
Mostly cloudy, with a low around 13. Wind chill values between 5 and 10. North northeast wind 5 to 11 mph, with gusts as high as 16 mph.
Monday
Mostly sunny, with a high near 26. North northeast wind around 5 mph becoming light and variable in the afternoon.
Monday Night
Mostly cloudy, with a temperature falling to near 19 by 8pm, then rising to around 27 during the remainder of the night. South wind 5 to 14 mph, with gusts as high as 22 mph.
Tuesday
Partly sunny, with a high near 42. South southwest wind around 14 mph, with gusts as high as 22 mph.
Tuesday Night
A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 34. Southwest wind 14 to 18 mph, with gusts as high as 26 mph.
Wednesday
Mostly cloudy, with a high near 41.
Wednesday Night
A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 22.
Thursday
A 30 percent chance of snow before noon. Mostly cloudy, with a high near 31.
Thursday Night
Mostly cloudy, with a low around 13.
Friday
Partly sunny, with a high near 20.
Friday Night
Mostly cloudy, with a low around 2.
Saturday
Mostly sunny, with a high near 15.
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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:
12:01 am CST Dec 7, 2025
Forecast Valid:
12am CST Dec 7, 2025-6pm CST Dec 13, 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