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

29°F

-2°C

Humidity 56%
Wind Speed Calm
Barometer 30.16 in (1022.0 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Last update 9 Feb 9:54 am CST
Extended Forecast for

Forsyth IL

  • Today

    Today: Mostly sunny, with a high near 42. South southeast wind 5 to 7 mph.

    High: 42 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 35. South southeast wind 8 to 11 mph becoming west southwest after midnight. Winds could gust as high as 21 mph.

    Low: 35 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 51. Northwest wind 9 to 13 mph, with gusts as high as 20 mph.

    High: 51 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 26. North northwest wind around 9 mph.

    Low: 26 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 44. North northwest wind 7 to 9 mph.

    High: 44 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 28. North northwest wind around 6 mph becoming east after midnight.

    Low: 28 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 41. East southeast wind 6 to 9 mph.

    High: 41 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A 40 percent chance of snow. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Chance Snow

  • Friday

    Friday: Mostly cloudy, with a high near 41.

    High: 41 °F

    Mostly Cloudy

Detailed Forecast

Today
Mostly sunny, with a high near 42. South southeast wind 5 to 7 mph.
Tonight
Partly cloudy, with a low around 35. South southeast wind 8 to 11 mph becoming west southwest after midnight. Winds could gust as high as 21 mph.
Tuesday
Mostly sunny, with a high near 51. Northwest wind 9 to 13 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 26. North northwest wind around 9 mph.
Wednesday
Mostly sunny, with a high near 44. North northwest wind 7 to 9 mph.
Wednesday Night
Mostly cloudy, with a low around 28. North northwest wind around 6 mph becoming east after midnight.
Thursday
Mostly cloudy, with a high near 41. East southeast wind 6 to 9 mph.
Thursday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 27.
Friday
Mostly cloudy, with a high near 41.
Friday Night
A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 26.
Saturday
A chance of rain. Mostly cloudy, with a high near 43.
Saturday Night
A chance of rain. Mostly cloudy, with a low around 29.
Sunday
A chance of rain. Mostly sunny, with a high near 44.
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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:
9:36 am CST Feb 9, 2026
Forecast Valid:
10am CST Feb 9, 2026-6pm CST Feb 15, 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