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.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
12:01 am CST Dec 7, 2025
12am CST Dec 7, 2025-6pm CST Dec 13, 2025
 
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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