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.

Overcast

29°F

-2°C

Humidity 75%
Wind Speed E 10 mph
Barometer 30.37 in (1029.0 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 29 Nov 2:54 am CST
Extended Forecast for

Decatur Airport IL

Winter Storm Warning November 29, 03:22am until November 30, 06:00am
Click here for hazard details and duration
Winter Storm Warning
  •  
    Winter Storm Warning November 29, 03:22am until November 30, 06:00am

    NOW until 6:00am Sun

    Winter Storm Warning

  • Overnight

    Low: 25 °F

    Snow

  • Saturday

    Saturday: Snow. The snow could be heavy at times. Widespread blowing snow before 4pm, then patchy blowing snow after 5pm. High near 35. Breezy, with a southeast wind 14 to 22 mph, with gusts as high as 36 mph. Chance of precipitation is 100%. New snow accumulation of 5 to 9 inches possible.

    High: 35 °F

    Heavy Snow
    and Blowing
    Snow

  • Saturday Night

    Saturday Night: Snow before 7pm, then rain and snow between 7pm and 11pm, then snow likely after 11pm. Low around 22. Breezy, with a south southeast wind 20 to 22 mph becoming west after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 22 °F

    Breezy.
    Rain/Snow
    then Chance
    Snow

  • Sunday

    Sunday: A 30 percent chance of snow after noon. Mostly cloudy, with a high near 26. Breezy, with a west northwest wind 13 to 21 mph, with gusts as high as 30 mph.

    High: 26 °F

    Mostly Cloudy
    and Breezy
    then Chance
    Snow

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 13. Northwest wind 6 to 11 mph becoming light and variable after midnight. Winds could gust as high as 16 mph.

    Low: 13 °F

    Mostly Cloudy

  • Monday

    Monday: A 40 percent chance of snow after noon. Cloudy, with a high near 27. Calm wind becoming southeast around 5 mph.

    High: 27 °F

    Cloudy then
    Chance Snow

  • Monday Night

    Monday Night: Snow likely, mainly before midnight. Cloudy, with a low around 16. Calm wind becoming north northwest around 5 mph after midnight. Chance of precipitation is 70%.

    Low: 16 °F

    Snow Likely
    then Chance
    Snow

  • Tuesday

    Tuesday: Partly sunny, with a high near 25.

    High: 25 °F

    Partly Sunny

Detailed Forecast

Overnight
Snow. Low around 25. East southeast wind 9 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. Total nighttime snow accumulation of around an inch possible.
Saturday
Snow. The snow could be heavy at times. Widespread blowing snow before 4pm, then patchy blowing snow after 5pm. High near 35. Breezy, with a southeast wind 14 to 22 mph, with gusts as high as 36 mph. Chance of precipitation is 100%. New snow accumulation of 5 to 9 inches possible.
Saturday Night
Snow before 7pm, then rain and snow between 7pm and 11pm, then snow likely after 11pm. Low around 22. Breezy, with a south southeast wind 20 to 22 mph becoming west after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Sunday
A 30 percent chance of snow after noon. Mostly cloudy, with a high near 26. Breezy, with a west northwest wind 13 to 21 mph, with gusts as high as 30 mph.
Sunday Night
Mostly cloudy, with a low around 13. Northwest wind 6 to 11 mph becoming light and variable after midnight. Winds could gust as high as 16 mph.
Monday
A 40 percent chance of snow after noon. Cloudy, with a high near 27. Calm wind becoming southeast around 5 mph.
Monday Night
Snow likely, mainly before midnight. Cloudy, with a low around 16. Calm wind becoming north northwest around 5 mph after midnight. Chance of precipitation is 70%.
Tuesday
Partly sunny, with a high near 25.
Tuesday Night
Mostly cloudy, with a low around 13.
Wednesday
Partly sunny, with a high near 32.
Wednesday Night
Mostly cloudy, with a low around 11.
Thursday
Mostly sunny, with a high near 23.
Thursday Night
Mostly cloudy, with a low around 12.
Friday
Mostly cloudy, with a high near 33.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur Airport IL
 39.84°N 88.88°W (Elev. 650 ft)
Last Update:
3:16 am CST Nov 29, 2025
Forecast Valid:
3am CST Nov 29, 2025-6pm CST Dec 5, 2025
 
Forecast Discussion
 
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Additional Resources

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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