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

25°F

-4°C

Humidity 92%
Wind Speed Calm
Barometer 30.24 in (1024.7 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Last update 13 Feb 1:54 am CST
Extended Forecast for

Forsyth IL

  • Overnight

    Overnight: Mostly clear, with a low around 29. South southeast wind around 6 mph.

    Low: 29 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 55. South southwest wind 7 to 14 mph, with gusts as high as 20 mph.

    High: 55 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 32. South wind 5 to 7 mph.

    Low: 32 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 40 percent chance of rain after noon. Cloudy, with a high near 51. South southeast wind 3 to 8 mph.

    High: 51 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday Night

    Saturday Night: Rain likely, mainly before midnight. Cloudy, with a low around 39. East southeast wind around 8 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 39 °F

    Rain Likely

  • Sunday

    Sunday: Cloudy through mid morning, then gradual clearing, with a high near 57. Northeast wind 7 to 9 mph.

    High: 57 °F

    Gradual
    Clearing

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 35. North wind around 6 mph becoming light and variable.

    Low: 35 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 58.

    High: 58 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 29. South southeast wind around 6 mph.
Friday
Sunny, with a high near 55. South southwest wind 7 to 14 mph, with gusts as high as 20 mph.
Friday Night
Increasing clouds, with a low around 32. South wind 5 to 7 mph.
Saturday
A 40 percent chance of rain after noon. Cloudy, with a high near 51. South southeast wind 3 to 8 mph.
Saturday Night
Rain likely, mainly before midnight. Cloudy, with a low around 39. East southeast wind around 8 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Cloudy through mid morning, then gradual clearing, with a high near 57. Northeast wind 7 to 9 mph.
Sunday Night
Mostly clear, with a low around 35. North wind around 6 mph becoming light and variable.
Washington's Birthday
Partly sunny, with a high near 58.
Monday Night
Mostly cloudy, with a low around 40.
Tuesday
Mostly cloudy, with a high near 60.
Tuesday Night
Mostly cloudy, with a low around 51. Breezy.
Wednesday
Partly sunny, with a high near 67. Breezy.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 42.
Thursday
Mostly sunny, with a high near 59.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Forsyth IL
 39.93°N 88.96°W (Elev. 650 ft)
Last Update:
12:51 am CST Feb 13, 2026
Forecast Valid:
2am CST Feb 13, 2026-6pm CST Feb 19, 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