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

26°F

-3°C

Humidity 66%
Wind Speed SE 9 mph
Barometer 30.31 in (1027.5 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill17°F (-8°C)
Last update 7 Feb 8:54 pm CST
Extended Forecast for

Decatur Airport IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 20. Southeast wind 8 to 11 mph, with gusts as high as 21 mph.

    Low: 20 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 33. Southeast wind 13 to 16 mph, with gusts as high as 24 mph.

    High: 33 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 23. East southeast wind 7 to 10 mph, with gusts as high as 15 mph.

    Low: 23 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 45. South wind around 8 mph.

    High: 45 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 33. South wind 8 to 10 mph, with gusts as high as 16 mph.

    Low: 33 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 50. West southwest wind around 10 mph becoming north northwest in the afternoon. Winds could gust as high as 15 mph.

    High: 50 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain. Mostly cloudy, with a low around 30. North northeast wind 8 to 10 mph.

    Low: 30 °F

    Chance Rain

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 44.

    High: 44 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 20. Southeast wind 8 to 11 mph, with gusts as high as 21 mph.
Sunday
Mostly cloudy, with a high near 33. Southeast wind 13 to 16 mph, with gusts as high as 24 mph.
Sunday Night
Partly cloudy, with a low around 23. East southeast wind 7 to 10 mph, with gusts as high as 15 mph.
Monday
Mostly sunny, with a high near 45. South wind around 8 mph.
Monday Night
Mostly clear, with a low around 33. South wind 8 to 10 mph, with gusts as high as 16 mph.
Tuesday
Mostly sunny, with a high near 50. West southwest wind around 10 mph becoming north northwest in the afternoon. Winds could gust as high as 15 mph.
Tuesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 30. North northeast wind 8 to 10 mph.
Wednesday
Mostly cloudy, with a high near 44.
Wednesday Night
Mostly cloudy, with a low around 28.
Thursday
A 30 percent chance of rain after noon. Cloudy, with a high near 40.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 23.
Friday
Mostly sunny, with a high near 40.
Friday Night
Mostly cloudy, with a low around 22.
Saturday
A chance of rain and snow. Mostly sunny, with a high near 39.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur Airport IL
 39.84°N 88.88°W (Elev. 650 ft)
Last Update:
8:38 pm CST Feb 7, 2026
Forecast Valid:
9pm CST Feb 7, 2026-6pm CST Feb 14, 2026
 
Forecast Discussion
 
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Additional Resources

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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