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

28°F

-2°C

Humidity 72%
Wind Speed NW 10 mph
Barometer 30.48 in (1032.8 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 11 Jan 1:54 pm CST
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 35. West wind 8 to 13 mph, with gusts as high as 20 mph.

    High: 35 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy during the early evening, then gradual clearing, with a low around 25. Southwest wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 25 °F

    Gradual
    Clearing

  • Monday

    Monday: Mostly sunny, with a high near 45. West southwest wind 8 to 11 mph, with gusts as high as 22 mph.

    High: 45 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 33. Southwest wind 6 to 10 mph, with gusts as high as 17 mph.

    Low: 33 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 54. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 54 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 34. West wind around 11 mph, with gusts as high as 20 mph.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of snow after noon. Mostly cloudy, with a high near 40. Breezy, with a northwest wind 13 to 20 mph, with gusts as high as 32 mph.

    High: 40 °F

    Mostly Cloudy
    then Chance
    Snow and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 15.

    Low: 15 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 30.

    High: 30 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 35. West wind 8 to 13 mph, with gusts as high as 20 mph.
Tonight
Mostly cloudy during the early evening, then gradual clearing, with a low around 25. Southwest wind 7 to 11 mph, with gusts as high as 21 mph.
Monday
Mostly sunny, with a high near 45. West southwest wind 8 to 11 mph, with gusts as high as 22 mph.
Monday Night
Partly cloudy, with a low around 33. Southwest wind 6 to 10 mph, with gusts as high as 17 mph.
Tuesday
Partly sunny, with a high near 54. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 34. West wind around 11 mph, with gusts as high as 20 mph.
Wednesday
A 40 percent chance of snow after noon. Mostly cloudy, with a high near 40. Breezy, with a northwest wind 13 to 20 mph, with gusts as high as 32 mph.
Wednesday Night
Mostly cloudy, with a low around 15.
Thursday
Mostly sunny, with a high near 30.
Thursday Night
Mostly cloudy, with a low around 24.
Friday
A chance of snow. Mostly cloudy, with a high near 37.
Friday Night
Mostly cloudy, with a low around 20.
Saturday
Mostly cloudy, with a high near 27.
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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:
12:32 pm CST Jan 11, 2026
Forecast Valid:
2pm CST Jan 11, 2026-6pm CST Jan 17, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation