National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

96°F

36°C

Humidity 41%
Wind Speed SW 7 mph
Barometer 29.99 in (1014.8 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index101°F (38°C)
Last update 1 Sep 4:54 pm CDT
Extended Forecast for

Forsyth IL

Heat Advisory September 1, 05:09pm until September 3, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 1, 05:09pm until September 3, 07:00pm

    NOW until 7:00pm Thu

    Heat Advisory

  • Tonight

    Low: 76 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 98. Heat index values as high as 103. Southwest wind 7 to 13 mph, with gusts as high as 16 mph.

    High: 98 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 77. South southwest wind around 8 mph.

    Low: 77 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 98. Heat index values as high as 104. South southwest wind 7 to 10 mph.

    High: 98 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 75. South wind around 6 mph.

    Low: 75 °F

    Mostly Clear

  • Friday

    Friday: Sunny and hot, with a high near 96. West southwest wind around 7 mph.

    High: 96 °F

    Hot

  • Friday Night

    Friday Night: Partly cloudy, with a low around 72. Southeast wind around 5 mph becoming calm in the evening.

    Low: 72 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 94.

    High: 94 °F

    Mostly Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 76. South southwest wind 5 to 7 mph.
Wednesday
Sunny and hot, with a high near 98. Heat index values as high as 103. Southwest wind 7 to 13 mph, with gusts as high as 16 mph.
Wednesday Night
Mostly clear, with a low around 77. South southwest wind around 8 mph.
Thursday
Sunny and hot, with a high near 98. Heat index values as high as 104. South southwest wind 7 to 10 mph.
Thursday Night
Mostly clear, with a low around 75. South wind around 6 mph.
Friday
Sunny and hot, with a high near 96. West southwest wind around 7 mph.
Friday Night
Partly cloudy, with a low around 72. Southeast wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 94.
Saturday Night
Partly cloudy, with a low around 69.
Sunday
Mostly sunny, with a high near 89.
Sunday Night
Partly cloudy, with a low around 67.
Labor Day
Mostly sunny, with a high near 86.
Monday Night
Partly cloudy, with a low around 64.
Tuesday
Mostly sunny, with a high near 86.
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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:
4:36 pm CDT Sep 1, 2026
Forecast Valid:
5pm CDT Sep 1, 2026-6pm CDT Sep 8, 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