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

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

21°F

-6°C

Humidity 78%
Wind Speed E 5 mph
Barometer 30.28 in (1026.4 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill14°F (-10°C)
Last update 8 Dec 3:54 pm CST
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: Mostly cloudy, with a temperature rising to around 28 by 5am. Light and variable wind becoming south 8 to 13 mph in the evening. Winds could gust as high as 21 mph.

    Low: 16 °F⇑

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 41. South southwest wind 11 to 14 mph, with gusts as high as 24 mph.

    High: 41 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 36. Breezy, with a south southwest wind 15 to 23 mph becoming west after midnight. Winds could gust as high as 34 mph.

    Low: 36 °F

    Chance Rain
    and Breezy

  • Wednesday

    Wednesday: Scattered rain showers before 9am, then scattered snow showers between 9am and noon. Mostly cloudy, with a temperature falling to around 32 by 5pm. Breezy, with a northwest wind 17 to 25 mph, with gusts as high as 38 mph. Chance of precipitation is 30%.

    High: 41 °F⇓

    Breezy.
    Scattered
    Rain/Snow
    then Mostly
    Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 22. West northwest wind 6 to 14 mph, with gusts as high as 20 mph.

    Low: 22 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 40 percent chance of snow. Mostly cloudy, with a high near 31. West wind around 7 mph.

    High: 31 °F

    Chance Snow

  • Thursday Night

    Thursday Night: A 30 percent chance of snow. Mostly cloudy, with a low around 20. North wind 6 to 10 mph, with gusts as high as 15 mph.

    Low: 20 °F

    Chance Snow

  • Friday

    Friday: A 30 percent chance of snow before noon. Mostly cloudy, with a high near 28.

    High: 28 °F

    Chance Snow
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 7.

    Low: 7 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a temperature rising to around 28 by 5am. Light and variable wind becoming south 8 to 13 mph in the evening. Winds could gust as high as 21 mph.
Tuesday
Partly sunny, with a high near 41. South southwest wind 11 to 14 mph, with gusts as high as 24 mph.
Tuesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 36. Breezy, with a south southwest wind 15 to 23 mph becoming west after midnight. Winds could gust as high as 34 mph.
Wednesday
Scattered rain showers before 9am, then scattered snow showers between 9am and noon. Mostly cloudy, with a temperature falling to around 32 by 5pm. Breezy, with a northwest wind 17 to 25 mph, with gusts as high as 38 mph. Chance of precipitation is 30%.
Wednesday Night
Mostly cloudy, with a low around 22. West northwest wind 6 to 14 mph, with gusts as high as 20 mph.
Thursday
A 40 percent chance of snow. Mostly cloudy, with a high near 31. West wind around 7 mph.
Thursday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 20. North wind 6 to 10 mph, with gusts as high as 15 mph.
Friday
A 30 percent chance of snow before noon. Mostly cloudy, with a high near 28.
Friday Night
Mostly cloudy, with a low around 7.
Saturday
Mostly cloudy, with a high near 15.
Saturday Night
Mostly cloudy, with a low around 5.
Sunday
Mostly sunny, with a high near 20.
Sunday Night
Mostly cloudy, with a low around 11.
Monday
Mostly cloudy, with a high near 30.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
3:36 pm CST Dec 8, 2025
Forecast Valid:
4pm CST Dec 8, 2025-6pm CST Dec 15, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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