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

25°F

-4°C

Humidity 66%
Wind Speed NE 8 mph
Barometer 30.37 in (1029.6 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill16°F (-9°C)
Last update 4 Feb 4:54 pm CST
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 11. Wind chill values between 3 and 8. North wind around 6 mph becoming calm.

    Low: 11 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Thursday

    Thursday: Mostly cloudy, with a high near 31. Wind chill values between 4 and 14. South southwest wind 5 to 13 mph, with gusts as high as 21 mph.

    High: 31 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 24. South southwest wind 6 to 11 mph, with gusts as high as 18 mph.

    Low: 24 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 41. Breezy, with a west southwest wind 14 to 20 mph becoming north northwest in the afternoon. Winds could gust as high as 29 mph.

    High: 41 °F

    Partly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 17. North northwest wind 7 to 15 mph, with gusts as high as 23 mph.

    Low: 17 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Mostly sunny, with a high near 28. North northeast wind around 7 mph becoming southeast in the afternoon.

    High: 28 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 21. South southeast wind 7 to 10 mph, with gusts as high as 17 mph.

    Low: 21 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 43.

    High: 43 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 26.

    Low: 26 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 11. Wind chill values between 3 and 8. North wind around 6 mph becoming calm.
Thursday
Mostly cloudy, with a high near 31. Wind chill values between 4 and 14. South southwest wind 5 to 13 mph, with gusts as high as 21 mph.
Thursday Night
Mostly cloudy, with a low around 24. South southwest wind 6 to 11 mph, with gusts as high as 18 mph.
Friday
Partly sunny, with a high near 41. Breezy, with a west southwest wind 14 to 20 mph becoming north northwest in the afternoon. Winds could gust as high as 29 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 17. North northwest wind 7 to 15 mph, with gusts as high as 23 mph.
Saturday
Mostly sunny, with a high near 28. North northeast wind around 7 mph becoming southeast in the afternoon.
Saturday Night
Mostly cloudy, with a low around 21. South southeast wind 7 to 10 mph, with gusts as high as 17 mph.
Sunday
Partly sunny, with a high near 43.
Sunday Night
Mostly clear, with a low around 26.
Monday
Mostly sunny, with a high near 50.
Monday Night
Mostly clear, with a low around 34.
Tuesday
Mostly sunny, with a high near 55.
Tuesday Night
A chance of rain. Partly cloudy, with a low around 36.
Wednesday
A chance of rain. Mostly sunny, with a high near 50.
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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:
5:17 pm CST Feb 4, 2026
Forecast Valid:
5pm CST Feb 4, 2026-6pm CST Feb 11, 2026
 
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Additional Resources

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