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.

Overcast

55°F

13°C

Humidity 80%
Wind Speed SW 12 mph
Barometer 29.80 in (1009.2 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Wind Chill52°F (11°C)
Last update 4 Nov 6:54 pm CST
Extended Forecast for

Forsyth IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 47. Southwest wind 9 to 11 mph, with gusts as high as 20 mph.

    Low: 47 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of rain after 5pm. Mostly cloudy, with a high near 58. West southwest wind 11 to 17 mph, with gusts as high as 22 mph.

    High: 58 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: A 20 percent chance of rain before 8pm. Mostly cloudy, with a low around 40. West wind 7 to 11 mph becoming north after midnight. Winds could gust as high as 15 mph.

    Low: 40 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 51. North wind 9 to 15 mph, with gusts as high as 20 mph.

    High: 51 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 30. North wind 5 to 8 mph becoming calm after midnight.

    Low: 30 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 52. Calm wind becoming northwest 5 to 7 mph in the morning.

    High: 52 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 29. Northwest wind around 5 mph becoming calm in the evening.

    Low: 29 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 59.

    High: 59 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 47. Southwest wind 9 to 11 mph, with gusts as high as 20 mph.
Thursday
A 20 percent chance of rain after 5pm. Mostly cloudy, with a high near 58. West southwest wind 11 to 17 mph, with gusts as high as 22 mph.
Thursday Night
A 20 percent chance of rain before 8pm. Mostly cloudy, with a low around 40. West wind 7 to 11 mph becoming north after midnight. Winds could gust as high as 15 mph.
Friday
Partly sunny, with a high near 51. North wind 9 to 15 mph, with gusts as high as 20 mph.
Friday Night
Mostly clear, with a low around 30. North wind 5 to 8 mph becoming calm after midnight.
Saturday
Sunny, with a high near 52. Calm wind becoming northwest 5 to 7 mph in the morning.
Saturday Night
Mostly clear, with a low around 29. Northwest wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 32.
Monday
Sunny, with a high near 63.
Monday Night
Clear, with a low around 37.
Tuesday
Sunny, with a high near 64.
Tuesday Night
Mostly clear, with a low around 37.
Veterans Day
Mostly sunny, with a high near 64.
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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:
7:16 pm CST Nov 4, 2026
Forecast Valid:
7pm CST Nov 4, 2026-6pm CST Nov 11, 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