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

33°F

1°C

Humidity 56%
Wind Speed Calm
Barometer 30.04 in (1017.5 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Last update 17 Nov 12:54 am CST
Extended Forecast for

4 Miles N Forsyth IL

  • Overnight

    Overnight: Mostly clear, with a low around 29. North northwest wind around 5 mph becoming light and variable.

    Low: 29 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 55. Light and variable wind becoming southeast 5 to 9 mph in the morning.

    High: 55 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Rain likely, then showers and possibly a thunderstorm after 9pm. Low around 42. Southeast wind 9 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 42 °F

    Showers

  • Tuesday

    Tuesday: A chance of showers before 9am, then a chance of rain after 9am. Mostly cloudy, with a high near 57. Southeast wind 10 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.

    High: 57 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 41. East northeast wind 6 to 10 mph.

    Low: 41 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 56. East northeast wind around 6 mph becoming northwest in the afternoon.

    High: 56 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 43. Light and variable wind becoming east southeast 5 to 7 mph after midnight.

    Low: 43 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday

    Thursday: Rain. High near 63. Chance of precipitation is 80%.

    High: 63 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely. Mostly cloudy, with a low around 51. Chance of precipitation is 70%.

    Low: 51 °F

    Rain Likely

Detailed Forecast

Overnight
Mostly clear, with a low around 29. North northwest wind around 5 mph becoming light and variable.
Monday
Mostly sunny, with a high near 55. Light and variable wind becoming southeast 5 to 9 mph in the morning.
Monday Night
Rain likely, then showers and possibly a thunderstorm after 9pm. Low around 42. Southeast wind 9 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
A chance of showers before 9am, then a chance of rain after 9am. Mostly cloudy, with a high near 57. Southeast wind 10 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.
Tuesday Night
Increasing clouds, with a low around 41. East northeast wind 6 to 10 mph.
Wednesday
Mostly cloudy, with a high near 56. East northeast wind around 6 mph becoming northwest in the afternoon.
Wednesday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 43. Light and variable wind becoming east southeast 5 to 7 mph after midnight.
Thursday
Rain. High near 63. Chance of precipitation is 80%.
Thursday Night
Rain likely. Mostly cloudy, with a low around 51. Chance of precipitation is 70%.
Friday
A 50 percent chance of rain. Partly sunny, with a high near 63.
Friday Night
A chance of rain. Mostly cloudy, with a low around 39.
Saturday
Partly sunny, with a high near 53.
Saturday Night
Partly cloudy, with a low around 35.
Sunday
Mostly sunny, with a high near 54.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles N Forsyth IL
 39.97°N 88.96°W (Elev. 679 ft)
Last Update:
12:36 am CST Nov 17, 2025
Forecast Valid:
1am CST Nov 17, 2025-6pm CST Nov 23, 2025
 
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