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

62°F

17°C

Humidity 60%
Wind Speed NE 16 mph
Barometer 30.18 in (1022.0 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 21 May 9:54 am CDT
Extended Forecast for

Forsyth IL

  • Today

    Today: Mostly sunny, with a high near 68. East wind 13 to 15 mph, with gusts as high as 23 mph.

    High: 68 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 54. East northeast wind 9 to 11 mph, with gusts as high as 21 mph.

    Low: 54 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 67. East northeast wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.

    High: 67 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Showers likely, mainly before 1am. Cloudy, with a low around 57. East wind 7 to 13 mph becoming west northwest after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 57 °F

    Showers
    Likely

  • Saturday

    Saturday: Mostly cloudy, with a high near 77. West wind around 10 mph, with gusts as high as 16 mph.

    High: 77 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 58. South southwest wind 3 to 6 mph.

    Low: 58 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 50 percent chance of showers. Mostly cloudy, with a high near 79. West southwest wind 5 to 7 mph.

    High: 79 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 59.

    Low: 59 °F

    Mostly Cloudy

  • Memorial Day

    Memorial Day: Partly sunny, with a high near 80.

    High: 80 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 68. East wind 13 to 15 mph, with gusts as high as 23 mph.
Tonight
Mostly cloudy, with a low around 54. East northeast wind 9 to 11 mph, with gusts as high as 21 mph.
Friday
A chance of showers, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 67. East northeast wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.
Friday Night
Showers likely, mainly before 1am. Cloudy, with a low around 57. East wind 7 to 13 mph becoming west northwest after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Mostly cloudy, with a high near 77. West wind around 10 mph, with gusts as high as 16 mph.
Saturday Night
Mostly cloudy, with a low around 58. South southwest wind 3 to 6 mph.
Sunday
A 50 percent chance of showers. Mostly cloudy, with a high near 79. West southwest wind 5 to 7 mph.
Sunday Night
Mostly cloudy, with a low around 59.
Memorial Day
Partly sunny, with a high near 80.
Monday Night
Mostly cloudy, with a low around 61.
Tuesday
A chance of showers. Partly sunny, with a high near 82.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Forsyth IL
 39.93°N 88.96°W (Elev. 650 ft)
Last Update:
9:37 am CDT May 21, 2026
Forecast Valid:
10am CDT May 21, 2026-6pm CDT May 27, 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