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

10°F

-12°C

Humidity 92%
Wind Speed N 6 mph
Barometer 30.31 in (1027.4 mb)
Dewpoint 8°F (-13°C)
Visibility 8.00 mi
Wind Chill0°F (-18°C)
Last update 4 Feb 2:54 am CST
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 10. Wind chill values between 2 and 7. North northeast wind around 6 mph.

    Low: 10 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 26. Wind chill values between zero and 10. North northeast wind 5 to 7 mph.

    High: 26 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 11. Light and variable wind.

    Low: 11 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 31. Wind chill values between 4 and 14. South southwest wind 5 to 10 mph, with gusts as high as 18 mph.

    High: 31 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 25. South southwest wind 7 to 10 mph becoming west after midnight. Winds could gust as high as 18 mph.

    Low: 25 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 42. Northwest wind 11 to 14 mph, with gusts as high as 24 mph.

    High: 42 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 20. Northwest wind 6 to 10 mph becoming north northeast after midnight. Winds could gust as high as 18 mph.

    Low: 20 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 10. Wind chill values between 2 and 7. North northeast wind around 6 mph.
Wednesday
Partly sunny, with a high near 26. Wind chill values between zero and 10. North northeast wind 5 to 7 mph.
Wednesday Night
Partly cloudy, with a low around 11. Light and variable wind.
Thursday
Mostly cloudy, with a high near 31. 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 25. South southwest wind 7 to 10 mph becoming west after midnight. Winds could gust as high as 18 mph.
Friday
Partly sunny, with a high near 42. Northwest wind 11 to 14 mph, with gusts as high as 24 mph.
Friday Night
Partly cloudy, with a low around 20. Northwest wind 6 to 10 mph becoming north northeast after midnight. Winds could gust as high as 18 mph.
Saturday
Mostly sunny, with a high near 33.
Saturday Night
Mostly cloudy, with a low around 25.
Sunday
Partly sunny, with a high near 41.
Sunday Night
Partly cloudy, with a low around 24.
Monday
Mostly sunny, with a high near 44.
Monday Night
Mostly cloudy, with a low around 31.
Tuesday
Partly sunny, with a high near 52.
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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:
3:37 am CST Feb 4, 2026
Forecast Valid:
3am CST Feb 4, 2026-6pm CST Feb 10, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation