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

41°F

5°C

Humidity 79%
Wind Speed W 8 mph
Barometer 30.05 in (1017.6 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 7 Mar 11:54 pm CDT
Extended Forecast for

Forsyth IL

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 35. West wind around 8 mph.

    Low: 35 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 63. Southwest wind 9 to 18 mph, with gusts as high as 25 mph.

    High: 63 °F

    Sunny

  • Sunday Night

    Sunday Night: 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. Breezy, with a south southwest wind 13 to 20 mph, with gusts as high as 25 mph.

    High: 73 °F

    Sunny then
    Sunny and
    Breezy

  • Monday Night

    Monday Night: Mostly clear, with a low around 58. South wind 11 to 14 mph, with gusts as high as 21 mph.

    Low: 58 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 78. Breezy, with a south southwest wind 11 to 21 mph, with gusts as high as 30 mph.

    High: 78 °F

    Mostly Sunny
    then Chance
    T-storms and
    Breezy

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 50. Breezy, with a south southwest wind 18 to 23 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 50 °F

    Showers and
    Breezy

  • Wednesday

    Wednesday: Showers. High near 63. Breezy. Chance of precipitation is 90%.

    High: 63 °F

    Breezy.
    Showers then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 29. Blustery.

    Low: 29 °F

    Partly Cloudy
    and Blustery

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 35. West wind around 8 mph.
Sunday
Sunny, with a high near 63. Southwest wind 9 to 18 mph, with gusts as high as 25 mph.
Sunday Night
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. Breezy, with a south southwest wind 13 to 20 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 58. South wind 11 to 14 mph, with gusts as high as 21 mph.
Tuesday
A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 78. Breezy, with a south southwest wind 11 to 21 mph, with gusts as high as 30 mph.
Tuesday Night
Showers and possibly a thunderstorm. Low around 50. Breezy, with a south southwest wind 18 to 23 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday
Showers. High near 63. Breezy. Chance of precipitation is 90%.
Wednesday Night
Partly cloudy, with a low around 29. Blustery.
Thursday
Mostly sunny, with a high near 48.
Thursday Night
Mostly cloudy, with a low around 39. Breezy.
Friday
Mostly cloudy, with a high near 62. Breezy.
Friday Night
Mostly cloudy, with a low around 34.
Saturday
Mostly cloudy, with a high near 49.
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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:
11:36 pm CST Mar 7, 2026
Forecast Valid:
11pm CST Mar 7, 2026-6pm CDT Mar 14, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation