Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

7°F

-14°C

Humidity 66%
Wind Speed SW 15 mph
Barometer 30.36 in (1029.9 mb)
Dewpoint -2°F (-19°C)
Visibility 10.00 mi
Wind Chill-10°F (-23°C)
Last update 26 Jan 3:54 pm CST
Extended Forecast for

Decatur IL

Cold Weather Advisory January 26, 06:00pm until January 27, 06:00am
Click here for hazard details and duration
Cold Weather Advisory
  • Tonight

    Tonight: Patchy blowing snow. Mostly clear, with a temperature rising to around 12 by 5am. Wind chill values between -5 and -13. South southwest wind 9 to 16 mph, with gusts as high as 26 mph.

    Low: 4 °F

    Patchy
    Blowing Snow

  • Tuesday

    Tuesday: Patchy blowing snow before noon. Mostly sunny, with a high near 20. Wind chill values between -3 and 6. West northwest wind 10 to 16 mph, with gusts as high as 26 mph.

    High: 20 °F

    Patchy
    Blowing Snow
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around -7. Wind chill values between -13 and -18. West northwest wind 3 to 7 mph.

    Low: -7 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 21. Wind chill values between -7 and -17. West southwest wind 5 to 9 mph, with gusts as high as 16 mph.

    High: 21 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around -1. West wind around 6 mph becoming north after midnight.

    Low: -1 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 13. North wind around 6 mph.

    High: 13 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around -4. North northwest wind 3 to 6 mph.

    Low: -4 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 12.

    High: 12 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around -1.

    Low: -1 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy blowing snow. Mostly clear, with a temperature rising to around 12 by 5am. Wind chill values between -5 and -13. South southwest wind 9 to 16 mph, with gusts as high as 26 mph.
Tuesday
Patchy blowing snow before noon. Mostly sunny, with a high near 20. Wind chill values between -3 and 6. West northwest wind 10 to 16 mph, with gusts as high as 26 mph.
Tuesday Night
Mostly clear, with a low around -7. Wind chill values between -13 and -18. West northwest wind 3 to 7 mph.
Wednesday
Mostly sunny, with a high near 21. Wind chill values between -7 and -17. West southwest wind 5 to 9 mph, with gusts as high as 16 mph.
Wednesday Night
Partly cloudy, with a low around -1. West wind around 6 mph becoming north after midnight.
Thursday
Partly sunny, with a high near 13. North wind around 6 mph.
Thursday Night
Partly cloudy, with a low around -4. North northwest wind 3 to 6 mph.
Friday
Mostly sunny, with a high near 12.
Friday Night
Mostly clear, with a low around -1.
Saturday
Mostly sunny, with a high near 17.
Saturday Night
Partly cloudy, with a low around 1.
Sunday
Mostly sunny, with a high near 22.
Sunday Night
Mostly cloudy, with a low around 12.
Monday
Partly sunny, with a high near 29.
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
3:36 pm CST Jan 26, 2026
4pm CST Jan 26, 2026-6pm CST Feb 2, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database