National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Light Snow and Breezy

20°F

-7°C

Humidity 68%
Wind Speed W 25 G 41 mph
Barometer 29.91 in (1013.0 mb)
Dewpoint 11°F (-12°C)
Visibility 8.00 mi
Wind Chill3°F (-16°C)
Last update 29 Dec 12:54 am CST
Extended Forecast for

Decatur IL

Wind Advisory until December 29, 03:00pm
Click here for hazard details and duration
Wind Advisory
  •  
    Wind Advisory until December 29, 03:00pm

    NOW until 3:00pm Mon

    Wind Advisory

  • Overnight

    Low: 13 °F

    Chance
    Flurries and
    Windy

  • Monday

    Monday: Mostly cloudy, with a high near 22. Wind chill values between -8 and 2. Windy, with a west northwest wind 25 to 30 mph decreasing to 18 to 23 mph in the afternoon. Winds could gust as high as 46 mph.

    High: 22 °F

    Mostly Cloudy
    and Windy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 12. Wind chill values between -1 and 4. Northwest wind 10 to 18 mph, with gusts as high as 26 mph.

    Low: 12 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 30. Wind chill values between -1 and 9. West southwest wind around 11 mph, with gusts as high as 20 mph.

    High: 30 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 26. West wind around 11 mph, with gusts as high as 18 mph.

    Low: 26 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 35. West northwest wind 10 to 14 mph, with gusts as high as 21 mph.

    High: 35 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 18. North wind around 9 mph.

    Low: 18 °F

    Mostly Cloudy

  • New Year's Day

    New Year's Day: Mostly sunny, with a high near 28.

    High: 28 °F

    Mostly Sunny

Detailed Forecast

Overnight
A chance of flurries before 3am. Mostly cloudy, with a low around 13. Wind chill values between -7 and 3. Windy, with a west wind 29 to 31 mph, with gusts as high as 48 mph.
Monday
Mostly cloudy, with a high near 22. Wind chill values between -8 and 2. Windy, with a west northwest wind 25 to 30 mph decreasing to 18 to 23 mph in the afternoon. Winds could gust as high as 46 mph.
Monday Night
Partly cloudy, with a low around 12. Wind chill values between -1 and 4. Northwest wind 10 to 18 mph, with gusts as high as 26 mph.
Tuesday
Increasing clouds, with a high near 30. Wind chill values between -1 and 9. West southwest wind around 11 mph, with gusts as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 26. West wind around 11 mph, with gusts as high as 18 mph.
Wednesday
Mostly cloudy, with a high near 35. West northwest wind 10 to 14 mph, with gusts as high as 21 mph.
Wednesday Night
Mostly cloudy, with a low around 18. North wind around 9 mph.
New Year's Day
Mostly sunny, with a high near 28.
Thursday Night
Partly cloudy, with a low around 17.
Friday
Mostly sunny, with a high near 32.
Friday Night
Mostly cloudy, with a low around 20.
Saturday
Mostly sunny, with a high near 34.
Saturday Night
Partly cloudy, with a low around 19.
Sunday
Mostly sunny, with a high near 36.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.86°N 88.94°W (Elev. 682 ft)
Last Update:
1:21 am CST Dec 29, 2025
Forecast Valid:
1am CST Dec 29, 2025-6pm CST Jan 4, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation