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.

Mostly Cloudy

29°F

-2°C

Humidity 66%
Wind Speed SW 9 mph
Barometer 29.86 in (1012.0 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 5 Dec 9:54 pm CST
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 24. West southwest wind 6 to 9 mph, with gusts as high as 16 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: Snow likely, mainly after midnight. Mostly cloudy, with a low around 27. Southeast wind 3 to 7 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 27 °F

    Slight Chance
    Snow then
    Snow Likely

  • Sunday

    Sunday: Rain and snow likely before noon. Mostly cloudy, with a high near 33. South southeast wind 7 to 11 mph becoming north in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 33 °F

    Rain/Snow
    Likely then
    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 10. North wind 5 to 10 mph, with gusts as high as 16 mph.

    Low: 10 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 24. North northeast wind around 5 mph becoming south southeast in the afternoon.

    High: 24 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 16. South wind 5 to 14 mph, with gusts as high as 21 mph.

    Low: 16 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 38.

    High: 38 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy
    then Chance
    Rain

Detailed Forecast

Tonight
Mostly cloudy, with a low around 24. West southwest wind 6 to 9 mph, with gusts as high as 16 mph.
Saturday
Mostly cloudy, with a high near 32. West northwest wind around 6 mph becoming light and variable in the afternoon.
Saturday Night
Snow likely, mainly after midnight. Mostly cloudy, with a low around 27. Southeast wind 3 to 7 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Sunday
Rain and snow likely before noon. Mostly cloudy, with a high near 33. South southeast wind 7 to 11 mph becoming north in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Sunday Night
Mostly cloudy, with a low around 10. North wind 5 to 10 mph, with gusts as high as 16 mph.
Monday
Mostly sunny, with a high near 24. North northeast wind around 5 mph becoming south southeast in the afternoon.
Monday Night
Partly cloudy, with a low around 16. South wind 5 to 14 mph, with gusts as high as 21 mph.
Tuesday
Partly sunny, with a high near 38.
Tuesday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 32.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 40.
Wednesday Night
Mostly cloudy, with a low around 21.
Thursday
Mostly cloudy, with a high near 33.
Thursday Night
Mostly cloudy, with a low around 15.
Friday
Partly sunny, with a high near 23.
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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:
8:36 pm CST Dec 5, 2025
Forecast Valid:
11pm CST Dec 5, 2025-6pm CST Dec 12, 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