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 Fog/Mist

24°F

-4°C

Humidity 96%
Wind Speed Calm
Barometer 30.11 in (1020.4 mb)
Dewpoint 23°F (-5°C)
Visibility 2.00 mi
Last update 1 Dec 6:54 pm CST
Extended Forecast for

3 Miles WSW Forsyth IL

Winter Weather Advisory until December 2, 06:00am
Click here for hazard details and duration
Winter Weather Advisory
  •  
    Winter Weather Advisory until December 2, 06:00am

    NOW until 6:00am Tue

    Winter Weather Advisory

  • Tonight

    Low: 15 °F

    Snow then
    Slight Chance
    Snow

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 23. Northwest wind 5 to 7 mph becoming south southwest in the afternoon.

    High: 23 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 16. South wind 6 to 10 mph, with gusts as high as 17 mph.

    Low: 16 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 33. South wind 9 to 11 mph becoming west in the afternoon. Winds could gust as high as 17 mph.

    High: 33 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Cloudy, then gradually becoming partly cloudy, with a low around 3. North northwest wind 9 to 13 mph, with gusts as high as 18 mph.

    Low: 3 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 12. North northwest wind 5 to 10 mph becoming light north in the afternoon. Winds could gust as high as 16 mph.

    High: 12 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around -3. Calm wind becoming south around 6 mph after midnight.

    Low: -3 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 28.

    High: 28 °F

    Mostly Sunny

Detailed Forecast

Tonight
Snow, mainly before 11pm. Low around 15. Calm wind becoming west northwest 5 to 7 mph after midnight. Chance of precipitation is 100%. Total nighttime snow accumulation of 1 to 3 inches possible.
Tuesday
Mostly cloudy, with a high near 23. Northwest wind 5 to 7 mph becoming south southwest in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 16. South wind 6 to 10 mph, with gusts as high as 17 mph.
Wednesday
Mostly cloudy, with a high near 33. South wind 9 to 11 mph becoming west in the afternoon. Winds could gust as high as 17 mph.
Wednesday Night
Cloudy, then gradually becoming partly cloudy, with a low around 3. North northwest wind 9 to 13 mph, with gusts as high as 18 mph.
Thursday
Sunny, with a high near 12. North northwest wind 5 to 10 mph becoming light north in the afternoon. Winds could gust as high as 16 mph.
Thursday Night
Partly cloudy, with a low around -3. Calm wind becoming south around 6 mph after midnight.
Friday
Mostly sunny, with a high near 28.
Friday Night
Mostly cloudy, with a low around 18.
Saturday
Mostly cloudy, with a high near 31.
Saturday Night
Mostly cloudy, with a low around 19.
Sunday
Mostly cloudy, with a high near 29.
Sunday Night
Mostly cloudy, with a low around 11.
Monday
Partly sunny, with a high near 29.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Forsyth IL
 39.89°N 89.02°W (Elev. 656 ft)
Last Update:
6:36 pm CST Dec 1, 2025
Forecast Valid:
7pm CST Dec 1, 2025-6pm CST Dec 8, 2025
 
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