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.

Partly Cloudy

28°F

-2°C

Humidity 58%
Wind Speed NW 14 mph
Barometer 30.25 in (1025.3 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill17°F (-8°C)
Last update 21 Feb 8:54 pm CST
Extended Forecast for

Forsyth IL

  • Tonight

    Tonight: A chance of flurries after midnight. Mostly cloudy, with a low around 19. Northwest wind 14 to 18 mph, with gusts as high as 26 mph.

    Low: 19 °F

    Chance
    Flurries

  • Sunday

    Sunday: Mostly cloudy, with a high near 28. Wind chill values between 3 and 13. Blustery, with a northwest wind 20 to 23 mph, with gusts as high as 33 mph.

    High: 28 °F

    Mostly Cloudy
    and Blustery

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 15. Wind chill values between -1 and 9. Blustery, with a northwest wind 17 to 20 mph, with gusts as high as 28 mph.

    Low: 15 °F

    Mostly Cloudy
    and Blustery
    then Partly
    Cloudy

  • Monday

    Monday: Sunny, with a high near 31. Wind chill values between -1 and 9. North northwest wind 9 to 18 mph, with gusts as high as 25 mph.

    High: 31 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 17. Light and variable wind becoming south 5 to 8 mph after midnight.

    Low: 17 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Partly sunny, with a high near 47. Breezy, with a south wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 29 mph.

    High: 47 °F

    Partly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 34. South southwest wind 10 to 14 mph, with gusts as high as 22 mph.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 51.

    High: 51 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 28.

    Low: 28 °F

    Chance Rain

Detailed Forecast

Tonight
A chance of flurries after midnight. Mostly cloudy, with a low around 19. Northwest wind 14 to 18 mph, with gusts as high as 26 mph.
Sunday
Mostly cloudy, with a high near 28. Wind chill values between 3 and 13. Blustery, with a northwest wind 20 to 23 mph, with gusts as high as 33 mph.
Sunday Night
Mostly cloudy, with a low around 15. Wind chill values between -1 and 9. Blustery, with a northwest wind 17 to 20 mph, with gusts as high as 28 mph.
Monday
Sunny, with a high near 31. Wind chill values between -1 and 9. North northwest wind 9 to 18 mph, with gusts as high as 25 mph.
Monday Night
Increasing clouds, with a low around 17. Light and variable wind becoming south 5 to 8 mph after midnight.
Tuesday
Partly sunny, with a high near 47. Breezy, with a south wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 29 mph.
Tuesday Night
Mostly cloudy, with a low around 34. South southwest wind 10 to 14 mph, with gusts as high as 22 mph.
Wednesday
Partly sunny, with a high near 51.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 28.
Thursday
A 40 percent chance of rain. Mostly sunny, with a high near 43.
Thursday Night
Mostly clear, with a low around 25.
Friday
Sunny, with a high near 55.
Friday Night
Mostly clear, with a low around 36.
Saturday
Partly sunny, with a high near 56.
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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 pm CST Feb 21, 2026
Forecast Valid:
9pm CST Feb 21, 2026-6pm CST Feb 28, 2026
 
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Additional Resources

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