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

20°F

-7°C

Humidity 74%
Wind Speed SW 9 mph
Barometer 30.03 in (1018.2 mb)
Dewpoint 13°F (-11°C)
Visibility 10.00 mi
Wind Chill10°F (-12°C)
Last update 5 Dec 10:54 am CST
Extended Forecast for

Decatur IL

  • Today

    Today: Mostly cloudy early, then becoming sunny, with a high near 29. South wind around 9 mph, with gusts as high as 17 mph.

    High: 29 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 24. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 17 mph.

    Low: 24 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 32. West northwest wind around 6 mph becoming light and variable in the afternoon.

    High: 32 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 50 percent chance of snow after midnight. Cloudy, with a low around 23. East southeast wind 3 to 7 mph.

    Low: 23 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: Snow likely before noon. Mostly cloudy, with a high near 32. East southeast wind 7 to 11 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

    High: 32 °F

    Snow Likely
    then Mostly
    Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 5. North wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 15 mph.

    Low: 5 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 24. Calm wind becoming south around 6 mph in the afternoon.

    High: 24 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 16.

    Low: 16 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 36.

    High: 36 °F

    Partly Sunny

Detailed Forecast

Today
Mostly cloudy early, then becoming sunny, with a high near 29. South wind around 9 mph, with gusts as high as 17 mph.
Tonight
Mostly cloudy, with a low around 24. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 17 mph.
Saturday
Mostly cloudy, with a high near 32. West northwest wind around 6 mph becoming light and variable in the afternoon.
Saturday Night
A 50 percent chance of snow after midnight. Cloudy, with a low around 23. East southeast wind 3 to 7 mph.
Sunday
Snow likely before noon. Mostly cloudy, with a high near 32. East southeast wind 7 to 11 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Sunday Night
Mostly cloudy, with a low around 5. North wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 15 mph.
Monday
Mostly sunny, with a high near 24. Calm wind becoming south around 6 mph in the afternoon.
Monday Night
Mostly cloudy, with a low around 16.
Tuesday
Partly sunny, with a high near 36.
Tuesday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 30.
Wednesday
A chance of rain. Mostly cloudy, with a high near 38.
Wednesday Night
Mostly cloudy, with a low around 15.
Thursday
Partly sunny, with a high near 27.
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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:
10:41 am CST Dec 5, 2025
Forecast Valid:
11am CST Dec 5, 2025-6pm CST Dec 11, 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