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

18°F

-8°C

Humidity 96%
Wind Speed Calm
Barometer 30.48 in (1033.2 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Last update 30 Nov 10:54 pm CST
Extended Forecast for

3 Miles WSW Forsyth IL

  • Tonight

    Tonight: Patchy fog after midnight. Otherwise, increasing clouds, with a low around 14. Light and variable wind.

    Low: 14 °F

    Patchy Fog

  • Monday

    Monday: Snow, mainly after 3pm. High near 29. Calm wind becoming southeast around 6 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    High: 29 °F

    Cloudy then
    Snow

  • Monday Night

    Monday Night: Snow, mainly before midnight. Low around 16. Calm wind becoming northwest 5 to 7 mph after midnight. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

    Low: 16 °F

    Snow then
    Chance Snow

  • Tuesday

    Tuesday: Partly sunny, with a high near 25. Northwest wind around 7 mph becoming southwest in the afternoon.

    High: 25 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 16. South wind 6 to 11 mph, with gusts as high as 16 mph.

    Low: 16 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 33. South southwest wind 8 to 13 mph, with gusts as high as 17 mph.

    High: 33 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 6. West wind 8 to 13 mph becoming north northwest after midnight. Winds could gust as high as 18 mph.

    Low: 6 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 15.

    High: 15 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 0.

    Low: 0 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Patchy fog after midnight. Otherwise, increasing clouds, with a low around 14. Light and variable wind.
Monday
Snow, mainly after 3pm. High near 29. Calm wind becoming southeast around 6 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Monday Night
Snow, mainly before midnight. Low around 16. Calm wind becoming northwest 5 to 7 mph after midnight. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.
Tuesday
Partly sunny, with a high near 25. Northwest wind around 7 mph becoming southwest in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 16. South wind 6 to 11 mph, with gusts as high as 16 mph.
Wednesday
Partly sunny, with a high near 33. South southwest wind 8 to 13 mph, with gusts as high as 17 mph.
Wednesday Night
Mostly cloudy, with a low around 6. West wind 8 to 13 mph becoming north northwest after midnight. Winds could gust as high as 18 mph.
Thursday
Mostly sunny, with a high near 15.
Thursday Night
Mostly cloudy, with a low around 0.
Friday
A 40 percent chance of snow after noon. Mostly cloudy, with a high near 27.
Friday Night
Mostly cloudy, with a low around 19.
Saturday
Mostly cloudy, with a high near 31.
Saturday Night
Mostly cloudy, with a low around 20.
Sunday
Mostly cloudy, with a high near 30.
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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:
9:36 pm CST Nov 30, 2025
Forecast Valid:
11pm CST Nov 30, 2025-6pm CST Dec 7, 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