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

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Mostly Cloudy

68°F

20°C

Humidity 76%
Wind Speed NE 10 mph
Barometer 30.07 in (1017.9 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 14 Oct 9:54 pm CDT
Extended Forecast for

Forsyth IL

  • Tonight

    Tonight: A slight chance of showers between 1am and 4am. Mostly cloudy, with a low around 61. East northeast wind 8 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 20%.

    Low: 61 °F

    Cloudy then
    Slight Chance
    Showers

  • Thursday

    Thursday: Showers and thunderstorms before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. High near 76. East wind 8 to 10 mph becoming south in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 76 °F

    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am. Mostly cloudy, with a low around 48. Breezy, with a west southwest wind 11 to 16 mph becoming northwest 18 to 23 mph after midnight. Winds could gust as high as 31 mph. Chance of precipitation is 50%.

    Low: 48 °F

    Chance
    T-storms then
    Chance
    Showers and
    Breezy

  • Friday

    Friday: A 30 percent chance of showers after 1pm. Partly sunny, with a high near 57. Breezy, with a northwest wind 23 to 26 mph, with gusts as high as 36 mph.

    High: 57 °F

    Breezy.
    Partly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming clear, with a low around 37. North wind 11 to 18 mph, with gusts as high as 22 mph.

    Low: 37 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Areas of frost before 8am. Otherwise, sunny, with a high near 60. North wind 5 to 7 mph becoming calm in the afternoon.

    High: 60 °F

    Areas Frost
    then Sunny

  • Saturday Night

    Saturday Night: Areas of frost after 5am. Otherwise, clear, with a low around 36. Calm wind becoming south southeast around 6 mph after midnight.

    Low: 36 °F

    Clear then
    Areas Frost

  • Sunday

    Sunday: Areas of frost before 8am. Otherwise, sunny, with a high near 67.

    High: 67 °F

    Areas Frost
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Tonight
A slight chance of showers between 1am and 4am. Mostly cloudy, with a low around 61. East northeast wind 8 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 20%.
Thursday
Showers and thunderstorms before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. High near 76. East wind 8 to 10 mph becoming south in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
A chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am. Mostly cloudy, with a low around 48. Breezy, with a west southwest wind 11 to 16 mph becoming northwest 18 to 23 mph after midnight. Winds could gust as high as 31 mph. Chance of precipitation is 50%.
Friday
A 30 percent chance of showers after 1pm. Partly sunny, with a high near 57. Breezy, with a northwest wind 23 to 26 mph, with gusts as high as 36 mph.
Friday Night
Mostly cloudy, then gradually becoming clear, with a low around 37. North wind 11 to 18 mph, with gusts as high as 22 mph.
Saturday
Areas of frost before 8am. Otherwise, sunny, with a high near 60. North wind 5 to 7 mph becoming calm in the afternoon.
Saturday Night
Areas of frost after 5am. Otherwise, clear, with a low around 36. Calm wind becoming south southeast around 6 mph after midnight.
Sunday
Areas of frost before 8am. Otherwise, sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 40.
Monday
Mostly sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
Mostly sunny, with a high near 74.
Tuesday Night
Mostly clear, with a low around 48.
Wednesday
Sunny, with a high near 78.
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:
10:06 pm CDT Oct 14, 2026
Forecast Valid:
10pm CDT Oct 14, 2026-6pm CDT Oct 21, 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