National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

3°F

-16°C

Humidity 87%
Wind Speed Calm
Barometer 30.22 in (1024.6 mb)
Dewpoint 0°F (-18°C)
Visibility 10.00 mi
Last update 4 Dec 10:54 pm CST
Extended Forecast for

Forsyth IL

  • Tonight

    Tonight: Areas of freezing fog. Mostly cloudy, with a low around -1. Wind chill values between -4 and -9. Light and variable wind becoming south around 5 mph after midnight.

    Low: -1 °F

    Areas
    Freezing Fog

  • Friday

    Friday: Patchy freezing fog before 9am. Sunny, with a high near 30. Wind chill values between -8 and 2. South wind 6 to 10 mph, with gusts as high as 17 mph.

    High: 30 °F

    Patchy
    Freezing Fog
    then Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 23. South wind 7 to 10 mph becoming west after midnight. Winds could gust as high as 15 mph.

    Low: 23 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 31. West wind around 6 mph becoming northeast in the afternoon.

    High: 31 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 40 percent chance of snow after midnight. Mostly cloudy, with a low around 21. East wind 5 to 8 mph.

    Low: 21 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: A 50 percent chance of snow before noon. Mostly cloudy, with a high near 29. East wind 8 to 14 mph becoming north in the afternoon. Winds could gust as high as 18 mph.

    High: 29 °F

    Chance Snow
    then Mostly
    Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 6. North wind 5 to 13 mph, with gusts as high as 16 mph.

    Low: 6 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 25.

    High: 25 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 15.

    Low: 15 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Areas of freezing fog. Mostly cloudy, with a low around -1. Wind chill values between -4 and -9. Light and variable wind becoming south around 5 mph after midnight.
Friday
Patchy freezing fog before 9am. Sunny, with a high near 30. Wind chill values between -8 and 2. South wind 6 to 10 mph, with gusts as high as 17 mph.
Friday Night
Mostly cloudy, with a low around 23. South wind 7 to 10 mph becoming west after midnight. Winds could gust as high as 15 mph.
Saturday
Mostly cloudy, with a high near 31. West wind around 6 mph becoming northeast in the afternoon.
Saturday Night
A 40 percent chance of snow after midnight. Mostly cloudy, with a low around 21. East wind 5 to 8 mph.
Sunday
A 50 percent chance of snow before noon. Mostly cloudy, with a high near 29. East wind 8 to 14 mph becoming north in the afternoon. Winds could gust as high as 18 mph.
Sunday Night
Mostly cloudy, with a low around 6. North wind 5 to 13 mph, with gusts as high as 16 mph.
Monday
Mostly sunny, with a high near 25.
Monday Night
Mostly cloudy, with a low around 15.
Tuesday
Mostly cloudy, with a high near 34.
Tuesday Night
Mostly cloudy, with a low around 26.
Wednesday
A chance of rain. Mostly cloudy, with a high near 37.
Wednesday Night
Mostly cloudy, with a low around 16.
Thursday
Partly sunny, with a high near 27.
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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 Dec 4, 2025
Forecast Valid:
11pm CST Dec 4, 2025-6pm CST Dec 11, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation