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

80°F

27°C

Humidity 33%
Wind Speed SW 13 mph
Barometer 29.76 in (1007.6 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 21 Mar 5:54 pm CDT
Extended Forecast for

Forsyth IL

  • Tonight

    Tonight: Mostly clear, with a low around 61. South southwest wind 10 to 14 mph, with gusts as high as 23 mph.

    Low: 61 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of showers after 2pm. Increasing clouds, with a high near 77. Breezy, with a southwest wind 13 to 23 mph becoming north northeast in the afternoon. Winds could gust as high as 30 mph.

    High: 77 °F

    Mostly Sunny
    then Slight
    Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 32. Breezy, with a north wind 14 to 24 mph, with gusts as high as 34 mph.

    Low: 32 °F

    Mostly Cloudy
    and Breezy
    then Mostly
    Clear

  • Monday

    Monday: Mostly sunny, with a high near 52. North northeast wind around 10 mph, with gusts as high as 16 mph.

    High: 52 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 33. East wind around 7 mph.

    Low: 33 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 60. South wind 8 to 10 mph, with gusts as high as 15 mph.

    High: 60 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 42. South southeast wind 6 to 8 mph.

    Low: 42 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 61. South southwest wind 10 to 14 mph, with gusts as high as 23 mph.
Sunday
A 20 percent chance of showers after 2pm. Increasing clouds, with a high near 77. Breezy, with a southwest wind 13 to 23 mph becoming north northeast in the afternoon. Winds could gust as high as 30 mph.
Sunday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 32. Breezy, with a north wind 14 to 24 mph, with gusts as high as 34 mph.
Monday
Mostly sunny, with a high near 52. North northeast wind around 10 mph, with gusts as high as 16 mph.
Monday Night
Mostly cloudy, with a low around 33. East wind around 7 mph.
Tuesday
Mostly sunny, with a high near 60. South wind 8 to 10 mph, with gusts as high as 15 mph.
Tuesday Night
Mostly cloudy, with a low around 42. South southeast wind 6 to 8 mph.
Wednesday
Partly sunny, with a high near 65.
Wednesday Night
Mostly cloudy, with a low around 51.
Thursday
Mostly sunny, with a high near 76.
Thursday Night
A chance of rain. Partly cloudy, with a low around 38.
Friday
A chance of rain. Partly sunny, with a high near 51.
Friday Night
Mostly cloudy, with a low around 32.
Saturday
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:
5:46 pm CDT Mar 21, 2026
Forecast Valid:
6pm CDT Mar 21, 2026-6pm CDT Mar 28, 2026
 
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Additional Resources

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Chance of Precipitation