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

37°F

3°C

Humidity 86%
Wind Speed Calm
Barometer 29.95 in (1014.2 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Last update 11 Nov 3:54 am CST
Extended Forecast for

Forsyth IL

  • Veterans Day

    Veterans Day: A 30 percent chance of showers and thunderstorms, mainly before 4pm. Increasing clouds, with a high near 65. South wind 6 to 16 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph.

    High: 65 °F

    Chance
    Showers

  • Tonight

    Tonight: Mostly cloudy, with a low around 40. North northwest wind 9 to 17 mph, with gusts as high as 26 mph.

    Low: 40 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers after 9am. Mostly cloudy, with a high near 47. Breezy, with a north northwest wind 13 to 20 mph, with gusts as high as 26 mph.

    High: 47 °F

    Slight Chance
    Showers and
    Breezy

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 30. North northwest wind 9 to 15 mph, with gusts as high as 21 mph.

    Low: 30 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 43. North northwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 43 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 24. North northwest wind 3 to 8 mph.

    Low: 24 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 45. North northwest wind 3 to 5 mph.

    High: 45 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 24.

    Low: 24 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 49.

    High: 49 °F

    Sunny

Detailed Forecast

Veterans Day
A 30 percent chance of showers and thunderstorms, mainly before 4pm. Increasing clouds, with a high near 65. South wind 6 to 16 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph.
Tonight
Mostly cloudy, with a low around 40. North northwest wind 9 to 17 mph, with gusts as high as 26 mph.
Thursday
A 20 percent chance of showers after 9am. Mostly cloudy, with a high near 47. Breezy, with a north northwest wind 13 to 20 mph, with gusts as high as 26 mph.
Thursday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 30. North northwest wind 9 to 15 mph, with gusts as high as 21 mph.
Friday
Sunny, with a high near 43. North northwest wind 10 to 15 mph, with gusts as high as 20 mph.
Friday Night
Mostly clear, with a low around 24. North northwest wind 3 to 8 mph.
Saturday
Sunny, with a high near 45. North northwest wind 3 to 5 mph.
Saturday Night
Clear, with a low around 24.
Sunday
Sunny, with a high near 49.
Sunday Night
Mostly clear, with a low around 26.
Monday
Sunny, with a high near 49.
Monday Night
Mostly clear, with a low around 27.
Tuesday
Sunny, with a high near 52.
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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:
3:16 am CST Nov 11, 2026
Forecast Valid:
4am CST Nov 11, 2026-6pm CST Nov 17, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation