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Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

65°F

18°C

Humidity 73%
Wind Speed Calm
Barometer 29.97 in (1014.6 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 11 Oct 7:54 pm CDT
Extended Forecast for

Forsyth IL

  • Tonight

    Tonight: Partly cloudy, with a low around 62. South wind 5 to 9 mph.

    Low: 62 °F

    Partly Cloudy

  • Columbus Day

    Columbus Day: Sunny, with a high near 90. Southwest wind 8 to 18 mph, with gusts as high as 23 mph.

    High: 90 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 71. South southwest wind 11 to 15 mph, with gusts as high as 20 mph.

    Low: 71 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 90. West southwest wind 13 to 16 mph, with gusts as high as 21 mph.

    High: 90 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 4am, then showers likely after 4am. Increasing clouds, with a low around 68. South southwest wind 5 to 7 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 68 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers. High near 79. East wind 5 to 8 mph becoming west in the morning. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 79 °F

    Showers

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 59. Northeast wind 10 to 13 mph, with gusts as high as 16 mph.

    Low: 59 °F

    Chance
    Showers

  • Thursday

    Thursday: Showers likely, then showers and possibly a thunderstorm after 1pm. High near 74. Chance of precipitation is 80%.

    High: 74 °F

    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 51. Breezy. Chance of precipitation is 50%.

    Low: 51 °F

    Chance
    T-storms and
    Breezy

Detailed Forecast

Tonight
Partly cloudy, with a low around 62. South wind 5 to 9 mph.
Columbus Day
Sunny, with a high near 90. Southwest wind 8 to 18 mph, with gusts as high as 23 mph.
Monday Night
Clear, with a low around 71. South southwest wind 11 to 15 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 90. West southwest wind 13 to 16 mph, with gusts as high as 21 mph.
Tuesday Night
A chance of showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 4am, then showers likely after 4am. Increasing clouds, with a low around 68. South southwest wind 5 to 7 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
Showers. High near 79. East wind 5 to 8 mph becoming west in the morning. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Wednesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 59. Northeast wind 10 to 13 mph, with gusts as high as 16 mph.
Thursday
Showers likely, then showers and possibly a thunderstorm after 1pm. High near 74. Chance of precipitation is 80%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 51. Breezy. Chance of precipitation is 50%.
Friday
Partly sunny, with a high near 64. Breezy.
Friday Night
Partly cloudy, with a low around 37. Breezy.
Saturday
Sunny, with a high near 58.
Saturday Night
Clear, with a low around 35.
Sunday
Sunny, with a high near 65.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Forsyth IL
 39.93°N 88.96°W (Elev. 650 ft)
Last Update:
7:36 pm CDT Oct 11, 2026
Forecast Valid:
8pm CDT Oct 11, 2026-6pm CDT Oct 18, 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