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

46°F

8°C

Humidity 56%
Wind Speed S 6 mph
Barometer 30.22 in (1023.9 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 12 Feb 3:54 pm CST
Extended Forecast for

4 Miles N Forsyth IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 30. South southeast wind around 6 mph.

    Low: 30 °F

    Mostly Cloudy

  • Friday

    Friday: Sunny, with a high near 55. South southwest wind 7 to 14 mph, with gusts as high as 20 mph.

    High: 55 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 32. South wind 3 to 7 mph.

    Low: 32 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 30 percent chance of rain after noon. Cloudy, with a high near 52. Southeast wind 3 to 8 mph.

    High: 52 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday Night

    Saturday Night: Rain likely, mainly before midnight. Mostly cloudy, with a low around 39. Southeast wind around 8 mph becoming east northeast after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 39 °F

    Rain Likely

  • Sunday

    Sunday: Mostly sunny, with a high near 57. Northeast wind 7 to 9 mph.

    High: 57 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 34. North wind around 6 mph becoming south southeast after midnight.

    Low: 34 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 58.

    High: 58 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 30. South southeast wind around 6 mph.
Friday
Sunny, with a high near 55. South southwest wind 7 to 14 mph, with gusts as high as 20 mph.
Friday Night
Increasing clouds, with a low around 32. South wind 3 to 7 mph.
Saturday
A 30 percent chance of rain after noon. Cloudy, with a high near 52. Southeast wind 3 to 8 mph.
Saturday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 39. Southeast wind around 8 mph becoming east northeast after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday
Mostly sunny, with a high near 57. Northeast wind 7 to 9 mph.
Sunday Night
Mostly clear, with a low around 34. North wind around 6 mph becoming south southeast after midnight.
Washington's Birthday
Partly sunny, with a high near 58.
Monday Night
Mostly cloudy, with a low around 41.
Tuesday
Mostly cloudy, with a high near 61.
Tuesday Night
Mostly cloudy, with a low around 52. Breezy.
Wednesday
Mostly cloudy, with a high near 67. Breezy.
Wednesday Night
Partly cloudy, with a low around 40.
Thursday
Mostly sunny, with a high near 56.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles N Forsyth IL
 39.97°N 88.96°W (Elev. 679 ft)
Last Update:
3:17 pm CST Feb 12, 2026
Forecast Valid:
4pm CST Feb 12, 2026-6pm CST Feb 19, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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