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

30°F

-1°C

Humidity 82%
Wind Speed N 17 G 26 mph
Barometer 30.17 in (1022.2 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill18°F (-8°C)
Last update 7 Dec 3:54 pm CST
Extended Forecast for

Decatur Airport IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 14. North northeast wind 6 to 13 mph, with gusts as high as 18 mph.

    Low: 14 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 28. Northeast wind around 6 mph becoming calm in the afternoon.

    High: 28 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 19. South wind 5 to 15 mph, with gusts as high as 23 mph.

    Low: 19 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 42. Southwest wind around 15 mph, with gusts as high as 23 mph.

    High: 42 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 35. Breezy, with a south wind 14 to 20 mph becoming west after midnight. Winds could gust as high as 32 mph.

    Low: 35 °F

    Cloudy then
    Chance Rain
    and Breezy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 40. Breezy, with a west northwest wind 14 to 21 mph, with gusts as high as 36 mph.

    High: 40 °F

    Mostly Cloudy
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 21. West northwest wind 7 to 11 mph, with gusts as high as 16 mph.

    Low: 21 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 50 percent chance of snow. Mostly cloudy, with a high near 30.

    High: 30 °F

    Chance Snow

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 13.

    Low: 13 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 14. North northeast wind 6 to 13 mph, with gusts as high as 18 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 28. Northeast wind around 6 mph becoming calm in the afternoon.
Monday Night
Mostly cloudy, with a low around 19. South wind 5 to 15 mph, with gusts as high as 23 mph.
Tuesday
Partly sunny, with a high near 42. Southwest wind around 15 mph, with gusts as high as 23 mph.
Tuesday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 35. Breezy, with a south wind 14 to 20 mph becoming west after midnight. Winds could gust as high as 32 mph.
Wednesday
Mostly cloudy, with a high near 40. Breezy, with a west northwest wind 14 to 21 mph, with gusts as high as 36 mph.
Wednesday Night
Mostly cloudy, with a low around 21. West northwest wind 7 to 11 mph, with gusts as high as 16 mph.
Thursday
A 50 percent chance of snow. Mostly cloudy, with a high near 30.
Thursday Night
Mostly cloudy, with a low around 13.
Friday
Partly sunny, with a high near 22.
Friday Night
Mostly cloudy, with a low around 2.
Saturday
Partly sunny, with a high near 13.
Saturday Night
Mostly cloudy, with a low around 2.
Sunday
Mostly sunny, with a high near 18.
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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:
3:16 pm CST Dec 7, 2025
Forecast Valid:
4pm CST Dec 7, 2025-6pm CST Dec 14, 2025
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation