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

49°F

9°C

Humidity 80%
Wind Speed SW 8 mph
Barometer 30.07 in (1018.2 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 9 Nov 11:54 pm CST
Extended Forecast for

Forsyth IL

  • Overnight

    Overnight: Clear, with a low around 45. West southwest wind 6 to 8 mph, with gusts as high as 16 mph.

    Low: 45 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 66. West wind around 6 mph becoming calm in the afternoon.

    High: 66 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 41. Light and variable wind.

    Low: 41 °F

    Increasing
    Clouds

  • Veterans Day

    Veterans Day: Mostly sunny, with a high near 63. South southeast wind 6 to 11 mph becoming west northwest 12 to 17 mph in the afternoon. Winds could gust as high as 24 mph.

    High: 63 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 37. North northwest wind 14 to 17 mph, with gusts as high as 22 mph.

    Low: 37 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 47. North northwest wind 15 to 18 mph, with gusts as high as 23 mph.

    High: 47 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 28. North northwest wind 9 to 15 mph, with gusts as high as 20 mph.

    Low: 28 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 43.

    High: 43 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 23.

    Low: 23 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 45. West southwest wind 6 to 8 mph, with gusts as high as 16 mph.
Tuesday
Sunny, with a high near 66. West wind around 6 mph becoming calm in the afternoon.
Tuesday Night
Increasing clouds, with a low around 41. Light and variable wind.
Veterans Day
Mostly sunny, with a high near 63. South southeast wind 6 to 11 mph becoming west northwest 12 to 17 mph in the afternoon. Winds could gust as high as 24 mph.
Wednesday Night
Mostly cloudy, with a low around 37. North northwest wind 14 to 17 mph, with gusts as high as 22 mph.
Thursday
Partly sunny, with a high near 47. North northwest wind 15 to 18 mph, with gusts as high as 23 mph.
Thursday Night
Partly cloudy, with a low around 28. North northwest wind 9 to 15 mph, with gusts as high as 20 mph.
Friday
Sunny, with a high near 43.
Friday Night
Mostly clear, with a low around 23.
Saturday
Sunny, with a high near 46.
Saturday Night
Mostly clear, with a low around 27.
Sunday
Mostly sunny, with a high near 50.
Sunday Night
Partly cloudy, with a low around 32.
Monday
Mostly sunny, with a high near 54.
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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:
12:31 am CST Nov 10, 2026
Forecast Valid:
12am CST Nov 10, 2026-6pm CST Nov 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation