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.

Mostly Cloudy

78°F

26°C

Humidity 54%
Wind Speed NE 9 mph
Barometer 30.11 in (1019.0 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 3 Aug 3:54 pm CDT
Extended Forecast for

Forsyth IL

  • Tonight

    Tonight: Increasing clouds, with a low around 60. East northeast wind around 6 mph.

    Low: 60 °F

    Increasing
    Clouds

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 80. East wind 5 to 9 mph.

    High: 80 °F

    Partly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 64. East wind 3 to 7 mph.

    Low: 64 °F

    Chance
    T-storms then
    Partly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 82. East wind around 6 mph.

    High: 82 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66. East southeast wind around 6 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 85. Calm wind becoming south southeast around 5 mph.

    High: 85 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 66. Southeast wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 60. East northeast wind around 6 mph.
Monday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 80. East wind 5 to 9 mph.
Monday Night
A 30 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 64. East wind 3 to 7 mph.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 82. East wind around 6 mph.
Tuesday Night
Mostly clear, with a low around 66. East southeast wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 85. Calm wind becoming south southeast around 5 mph.
Wednesday Night
Mostly clear, with a low around 66. Southeast wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 87.
Thursday Night
Mostly clear, with a low around 68.
Friday
Sunny, with a high near 88.
Friday Night
Mostly clear, with a low around 70.
Saturday
Sunny, with a high near 90.
Saturday Night
Mostly clear, with a low around 71.
Sunday
Mostly sunny, with a high near 90.
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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:
3:41 pm CDT Aug 3, 2025
Forecast Valid:
4pm CDT Aug 3, 2025-6pm CDT Aug 10, 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