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

45°F

7°C

Humidity 90%
Wind Speed SW 12 mph
Barometer 30.09 in (1019.2 mb)
Dewpoint 42°F (6°C)
Visibility 8.00 mi
Wind Chill39°F (4°C)
Last update 22 Nov 10:54 pm CST
Extended Forecast for

3 Miles WSW Forsyth IL

  • Tonight

    Tonight: Mostly clear, with a low around 36. West wind 6 to 10 mph, with gusts as high as 16 mph.

    Low: 36 °F

    Mostly Clear

  • Sunday

    Sunday: Patchy fog between 7am and 9am. Otherwise, sunny, with a high near 55. Northwest wind around 6 mph becoming calm in the afternoon.

    High: 55 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 35. Calm wind becoming south southeast 5 to 7 mph after midnight.

    Low: 35 °F

    Increasing
    Clouds

  • Monday

    Monday: A 40 percent chance of rain after noon. Mostly cloudy, with a high near 55. South southeast wind 8 to 13 mph, with gusts as high as 17 mph.

    High: 55 °F

    Mostly Cloudy
    then Chance
    Rain

  • Monday Night

    Monday Night: Rain. Low around 47. South southeast wind 7 to 11 mph, with gusts as high as 16 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 47 °F

    Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain after noon. Mostly cloudy, with a high near 59. West southwest wind 7 to 11 mph, with gusts as high as 16 mph.

    High: 59 °F

    Mostly Cloudy
    then Chance
    Rain

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 32. West wind 10 to 17 mph, with gusts as high as 23 mph.

    Low: 32 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 42. Breezy.

    High: 42 °F

    Mostly Sunny
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 24.

    Low: 24 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 36. West wind 6 to 10 mph, with gusts as high as 16 mph.
Sunday
Patchy fog between 7am and 9am. Otherwise, sunny, with a high near 55. Northwest wind around 6 mph becoming calm in the afternoon.
Sunday Night
Increasing clouds, with a low around 35. Calm wind becoming south southeast 5 to 7 mph after midnight.
Monday
A 40 percent chance of rain after noon. Mostly cloudy, with a high near 55. South southeast wind 8 to 13 mph, with gusts as high as 17 mph.
Monday Night
Rain. Low around 47. South southeast wind 7 to 11 mph, with gusts as high as 16 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
A 30 percent chance of rain after noon. Mostly cloudy, with a high near 59. West southwest wind 7 to 11 mph, with gusts as high as 16 mph.
Tuesday Night
Partly cloudy, with a low around 32. West wind 10 to 17 mph, with gusts as high as 23 mph.
Wednesday
Mostly sunny, with a high near 42. Breezy.
Wednesday Night
Mostly clear, with a low around 24.
Thanksgiving Day
Sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 20.
Friday
Mostly sunny, with a high near 39.
Friday Night
Partly cloudy, with a low around 24.
Saturday
A chance of rain. Mostly cloudy, with a high near 43.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Forsyth IL
 39.89°N 89.02°W (Elev. 656 ft)
Last Update:
10:51 pm CST Nov 22, 2025
Forecast Valid:
11pm CST Nov 22, 2025-6pm CST Nov 29, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation