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

35°F

2°C

Humidity 76%
Wind Speed SW 20 G 28 mph
Barometer 29.88 in (1012.5 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 9 Dec 9:54 am CST
Extended Forecast for

Decatur IL

  • Today

    Today: Partly sunny, with a high near 40. South southwest wind 11 to 14 mph, with gusts as high as 24 mph.

    High: 40 °F

    Partly Sunny

  • Tonight

    Tonight: A 40 percent chance of showers after 9pm. Cloudy, with a low around 35. Breezy, with a south wind 16 to 24 mph becoming west after midnight. Winds could gust as high as 34 mph.

    Low: 35 °F

    Chance
    Showers and
    Breezy

  • Wednesday

    Wednesday: A chance of rain showers before 9am, then a chance of snow showers between 9am and noon. Increasing clouds, with a temperature falling to around 31 by 5pm. Breezy, with a northwest wind 23 to 28 mph decreasing to 15 to 20 mph in the afternoon. Winds could gust as high as 45 mph. Chance of precipitation is 40%.

    High: 39 °F⇓

    Breezy.
    Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 23. West northwest wind 7 to 14 mph, with gusts as high as 20 mph.

    Low: 23 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 32. West wind around 6 mph.

    High: 32 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A 40 percent chance of snow. Mostly cloudy, with a low around 24. North northwest wind 6 to 9 mph becoming east after midnight.

    Low: 24 °F

    Chance Snow

  • Friday

    Friday: Mostly cloudy, with a high near 34. East southeast wind 9 to 13 mph becoming west northwest in the afternoon. Winds could gust as high as 21 mph.

    High: 34 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 10.

    Low: 10 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 18.

    High: 18 °F

    Mostly Cloudy

Detailed Forecast

Today
Partly sunny, with a high near 40. South southwest wind 11 to 14 mph, with gusts as high as 24 mph.
Tonight
A 40 percent chance of showers after 9pm. Cloudy, with a low around 35. Breezy, with a south wind 16 to 24 mph becoming west after midnight. Winds could gust as high as 34 mph.
Wednesday
A chance of rain showers before 9am, then a chance of snow showers between 9am and noon. Increasing clouds, with a temperature falling to around 31 by 5pm. Breezy, with a northwest wind 23 to 28 mph decreasing to 15 to 20 mph in the afternoon. Winds could gust as high as 45 mph. Chance of precipitation is 40%.
Wednesday Night
Mostly cloudy, with a low around 23. West northwest wind 7 to 14 mph, with gusts as high as 20 mph.
Thursday
Mostly cloudy, with a high near 32. West wind around 6 mph.
Thursday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 24. North northwest wind 6 to 9 mph becoming east after midnight.
Friday
Mostly cloudy, with a high near 34. East southeast wind 9 to 13 mph becoming west northwest in the afternoon. Winds could gust as high as 21 mph.
Friday Night
Mostly cloudy, with a low around 10.
Saturday
Mostly cloudy, with a high near 18.
Saturday Night
Mostly cloudy, with a low around 0.
Sunday
Sunny, with a high near 14.
Sunday Night
Partly cloudy, with a low around 4.
Monday
Partly sunny, with a high near 28.
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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:
5:26 am CST Dec 9, 2025
Forecast Valid:
10am CST Dec 9, 2025-6pm CST Dec 15, 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