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.

Overcast

24°F

-4°C

Humidity 84%
Wind Speed N 13 mph
Barometer 30.27 in (1025.7 mb)
Dewpoint 20°F (-7°C)
Visibility 9.00 mi
Wind Chill12°F (-11°C)
Last update 7 Dec 7:54 pm CST
Extended Forecast for

Elwin IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 15. North northeast wind 6 to 13 mph, with gusts as high as 17 mph.

    Low: 15 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 27. Northeast wind around 6 mph becoming calm in the morning.

    High: 27 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly cloudy, with a temperature falling to near 20 by 9pm, then rising to around 28 during the remainder of the night. Light south wind becoming south southwest 11 to 16 mph in the evening. Winds could gust as high as 23 mph.

    Low: 20 °F⇑

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 43. Southwest wind 14 to 16 mph, with gusts as high as 23 mph.

    High: 43 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 35. Breezy, with a south wind 14 to 23 mph becoming west after midnight. Winds could gust as high as 32 mph.

    Low: 35 °F

    Breezy.
    Cloudy then
    Chance Rain

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 41. Breezy, with a west northwest wind 14 to 23 mph, with gusts as high as 34 mph.

    High: 41 °F

    Mostly Cloudy
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 21. West northwest wind 7 to 11 mph, with gusts as high as 16 mph.

    Low: 21 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 50 percent chance of snow. Mostly cloudy, with a high near 30.

    High: 30 °F

    Chance Snow

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 13.

    Low: 13 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 15. North northeast wind 6 to 13 mph, with gusts as high as 17 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 27. Northeast wind around 6 mph becoming calm in the morning.
Monday Night
Mostly cloudy, with a temperature falling to near 20 by 9pm, then rising to around 28 during the remainder of the night. Light south wind becoming south southwest 11 to 16 mph in the evening. Winds could gust as high as 23 mph.
Tuesday
Partly sunny, with a high near 43. Southwest wind 14 to 16 mph, with gusts as high as 23 mph.
Tuesday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 35. Breezy, with a south wind 14 to 23 mph becoming west after midnight. Winds could gust as high as 32 mph.
Wednesday
Mostly cloudy, with a high near 41. Breezy, with a west northwest wind 14 to 23 mph, with gusts as high as 34 mph.
Wednesday Night
Mostly cloudy, with a low around 21. West northwest wind 7 to 11 mph, with gusts as high as 16 mph.
Thursday
A 50 percent chance of snow. Mostly cloudy, with a high near 30.
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 0.
Saturday
Partly sunny, with a high near 12.
Saturday Night
Mostly cloudy, with a low around 0.
Sunday
Mostly sunny, with a high near 18.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Elwin IL
 39.78°N 88.97°W (Elev. 705 ft)
Last Update:
6:36 pm CST Dec 7, 2025
Forecast Valid:
7pm CST Dec 7, 2025-6pm CST Dec 14, 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