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

29°F

-2°C

Humidity 72%
Wind Speed N 9 mph
Barometer 30.21 in (1024.0 mb)
Dewpoint 21°F (-6°C)
Visibility 9.00 mi
Wind Chill21°F (-6°C)
Last update 3 Feb 4:54 pm CST
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 13. Wind chill values between 5 and 10. Northeast wind around 7 mph.

    Low: 13 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 26. Wind chill values between 3 and 13. North northeast wind 5 to 8 mph.

    High: 26 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 10. Light and variable wind.

    Low: 10 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 32. Wind chill values between 4 and 14. South southwest wind 5 to 10 mph, with gusts as high as 18 mph.

    High: 32 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 26. South wind 8 to 13 mph becoming west after midnight. Winds could gust as high as 25 mph.

    Low: 26 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 41. Northwest wind 13 to 16 mph, with gusts as high as 29 mph.

    High: 41 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 18. North northwest wind 5 to 11 mph becoming northeast after midnight. Winds could gust as high as 22 mph.

    Low: 18 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 33.

    High: 33 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 13. Wind chill values between 5 and 10. Northeast wind around 7 mph.
Wednesday
Partly sunny, with a high near 26. Wind chill values between 3 and 13. North northeast wind 5 to 8 mph.
Wednesday Night
Partly cloudy, with a low around 10. Light and variable wind.
Thursday
Mostly cloudy, with a high near 32. Wind chill values between 4 and 14. South southwest wind 5 to 10 mph, with gusts as high as 18 mph.
Thursday Night
Partly cloudy, with a low around 26. South wind 8 to 13 mph becoming west after midnight. Winds could gust as high as 25 mph.
Friday
Mostly sunny, with a high near 41. Northwest wind 13 to 16 mph, with gusts as high as 29 mph.
Friday Night
Partly cloudy, with a low around 18. North northwest wind 5 to 11 mph becoming northeast after midnight. Winds could gust as high as 22 mph.
Saturday
Sunny, with a high near 33.
Saturday Night
Mostly cloudy, with a low around 24.
Sunday
Partly sunny, with a high near 38.
Sunday Night
Partly cloudy, with a low around 21.
Monday
Mostly sunny, with a high near 41.
Monday Night
Mostly cloudy, with a low around 29.
Tuesday
Partly sunny, with a high near 47.
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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:
4:32 pm CST Feb 3, 2026
Forecast Valid:
5pm CST Feb 3, 2026-6pm CST Feb 10, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation