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.

A Few Clouds

27°F

-3°C

Humidity 55%
Wind Speed S 12 mph
Barometer 29.91 in (1013.9 mb)
Dewpoint 13°F (-11°C)
Visibility 10.00 mi
Wind Chill16°F (-9°C)
Last update 5 Dec 2:54 pm CST
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 28. South wind around 9 mph, with gusts as high as 18 mph.

    High: 28 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 23. South wind 6 to 9 mph becoming west after midnight. Winds could gust as high as 15 mph.

    Low: 23 °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 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

    Mostly Cloudy
    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.

    Low: 16 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 38.

    High: 38 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 28. South wind around 9 mph, with gusts as high as 18 mph.
Tonight
Mostly cloudy, with a low around 23. South wind 6 to 9 mph becoming west after midnight. Winds could gust as high as 15 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 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.
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 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.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
3:16 pm CST Dec 5, 2025
Forecast Valid:
3pm 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