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

46°F

8°C

Humidity 79%
Wind Speed S 10 mph
Barometer 29.87 in (1011.6 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 9 Mar 2:54 am CDT
Extended Forecast for

3 Miles WSW Forsyth IL

  • Overnight

    Overnight: Clear, with a low around 44. South southwest wind around 14 mph, with gusts as high as 22 mph.

    Low: 44 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 73. South southwest wind 14 to 18 mph, with gusts as high as 25 mph.

    High: 73 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 58. South southwest wind around 14 mph, with gusts as high as 22 mph.

    Low: 58 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 78. South southwest wind 11 to 18 mph, with gusts as high as 25 mph.

    High: 78 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 50. South wind 16 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 50 °F

    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 63. Breezy, with a southwest wind 18 to 23 mph becoming northwest in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 63 °F

    Showers and
    Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 29. Blustery, with a northwest wind 10 to 20 mph, with gusts as high as 29 mph.

    Low: 29 °F

    Mostly Cloudy
    and Blustery
    then Mostly
    Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 41. Breezy.

    Low: 41 °F

    Mostly Cloudy
    and Breezy

Detailed Forecast

Overnight
Clear, with a low around 44. South southwest wind around 14 mph, with gusts as high as 22 mph.
Monday
Sunny, with a high near 73. South southwest wind 14 to 18 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 58. South southwest wind around 14 mph, with gusts as high as 22 mph.
Tuesday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 78. South southwest wind 11 to 18 mph, with gusts as high as 25 mph.
Tuesday Night
Showers and possibly a thunderstorm. Low around 50. South wind 16 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday
Showers and possibly a thunderstorm. High near 63. Breezy, with a southwest wind 18 to 23 mph becoming northwest in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Wednesday Night
Partly cloudy, with a low around 29. Blustery, with a northwest wind 10 to 20 mph, with gusts as high as 29 mph.
Thursday
Mostly sunny, with a high near 48.
Thursday Night
Mostly cloudy, with a low around 41. Breezy.
Friday
Mostly cloudy, with a high near 57. Breezy.
Friday Night
Mostly cloudy, with a low around 34.
Saturday
Mostly cloudy, with a high near 57.
Saturday Night
A chance of rain. Cloudy, with a low around 42.
Sunday
Rain likely. Mostly cloudy, with a high near 62. Breezy.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Forsyth IL
 39.89°N 89.02°W (Elev. 656 ft)
Last Update:
2:46 am CDT Mar 9, 2026
Forecast Valid:
3am CDT Mar 9, 2026-6pm CDT Mar 15, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation