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

79°F

26°C

Humidity 62%
Wind Speed NE 6 mph
Barometer 29.97 in (1014.6 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 29 Jul 6:54 pm CDT
Extended Forecast for

Forsyth IL

  • Tonight

    Tonight: Clear, with a low around 60. East northeast wind 5 to 7 mph.

    Low: 60 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 83. East southeast wind around 6 mph.

    High: 83 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 64. South southeast wind around 6 mph.

    Low: 64 °F

    Partly Cloudy

  • Friday

    Friday: Showers likely, with thunderstorms also possible after 4pm. Increasing clouds, with a high near 79. South wind 7 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 79 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 64. South southeast wind 13 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 64 °F

    Showers

  • Saturday

    Saturday: Showers likely, with thunderstorms also possible after 7am. Mostly cloudy, with a high near 77. Northeast wind 14 to 17 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 77 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 62. North northeast wind 11 to 18 mph, with gusts as high as 23 mph.

    Low: 62 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 60. East northeast wind 5 to 7 mph.
Thursday
Sunny, with a high near 83. East southeast wind around 6 mph.
Thursday Night
Partly cloudy, with a low around 64. South southeast wind around 6 mph.
Friday
Showers likely, with thunderstorms also possible after 4pm. Increasing clouds, with a high near 79. South wind 7 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers and possibly a thunderstorm. Low around 64. South southeast wind 13 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
Showers likely, with thunderstorms also possible after 7am. Mostly cloudy, with a high near 77. Northeast wind 14 to 17 mph, with gusts as high as 23 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Partly cloudy, with a low around 62. North northeast wind 11 to 18 mph, with gusts as high as 23 mph.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Mostly clear, with a low around 61.
Monday
Sunny, with a high near 82.
Monday Night
Mostly clear, with a low around 64.
Tuesday
Sunny, with a high near 84.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Mostly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Forsyth IL
 39.93°N 88.96°W (Elev. 650 ft)
Last Update:
6:36 pm CDT Jul 29, 2026
Forecast Valid:
7pm CDT Jul 29, 2026-6pm CDT Aug 5, 2026
 
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