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

43°F

6°C

Humidity 74%
Wind Speed S 7 mph
Barometer 29.89 in (1012.4 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 26 Feb 7:54 pm CST
Extended Forecast for

4 Miles N Forsyth IL

  • Tonight

    Tonight: Mostly clear, with a low around 30. South wind around 6 mph.

    Low: 30 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 66. Breezy, with a southwest wind 7 to 12 mph increasing to 18 to 23 mph in the afternoon. Winds could gust as high as 33 mph.

    High: 66 °F

    Sunny then
    Sunny and
    Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 33. Southwest wind 9 to 15 mph becoming north northeast after midnight. Winds could gust as high as 24 mph.

    Low: 33 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 51. East northeast wind 9 to 14 mph, with gusts as high as 20 mph.

    High: 51 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 24. North northeast wind 14 to 16 mph, with gusts as high as 23 mph.

    Low: 24 °F

    Partly Cloudy

  • Sunday

    Sunday: A 30 percent chance of snow after noon. Mostly cloudy, with a high near 38. Northeast wind around 15 mph, with gusts as high as 22 mph.

    High: 38 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday Night

    Sunday Night: Snow likely, mainly before midnight. Mostly cloudy, with a low around 23. East northeast wind around 14 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

    Low: 23 °F

    Snow Likely

  • Monday

    Monday: Partly sunny, with a high near 38.

    High: 38 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Tonight
Mostly clear, with a low around 30. South wind around 6 mph.
Friday
Sunny, with a high near 66. Breezy, with a southwest wind 7 to 12 mph increasing to 18 to 23 mph in the afternoon. Winds could gust as high as 33 mph.
Friday Night
Mostly clear, with a low around 33. Southwest wind 9 to 15 mph becoming north northeast after midnight. Winds could gust as high as 24 mph.
Saturday
Mostly sunny, with a high near 51. East northeast wind 9 to 14 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 24. North northeast wind 14 to 16 mph, with gusts as high as 23 mph.
Sunday
A 30 percent chance of snow after noon. Mostly cloudy, with a high near 38. Northeast wind around 15 mph, with gusts as high as 22 mph.
Sunday Night
Snow likely, mainly before midnight. Mostly cloudy, with a low around 23. East northeast wind around 14 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Monday
Partly sunny, with a high near 38.
Monday Night
A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 26.
Tuesday
A 50 percent chance of rain. Cloudy, with a high near 41.
Tuesday Night
Rain likely. Mostly cloudy, with a low around 31.
Wednesday
Rain likely. Cloudy, with a high near 51.
Wednesday Night
Rain likely. Cloudy, with a low around 43.
Thursday
Rain likely. Mostly cloudy, with a high near 61.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles N Forsyth IL
 39.97°N 88.96°W (Elev. 679 ft)
Last Update:
7:32 pm CST Feb 26, 2026
Forecast Valid:
8pm CST Feb 26, 2026-6pm CST Mar 5, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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