Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Overcast

81°F

27°C

Humidity 88%
Wind Speed S 9 mph
Barometer 29.93 in (1012.9 mb)
Dewpoint 77°F (25°C)
Visibility 7.00 mi
Heat Index88°F (31°C)
Last update 26 Jul 11:54 am CDT
Extended Forecast for

Forsyth IL

Heat Advisory until July 27, 09:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until July 27, 09:00pm

    NOW until 9:00pm Mon

    Heat Advisory

  • This Afternoon

    High: 89 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Mostly cloudy, with a low around 75. Southwest wind around 5 mph becoming light and variable.

    Low: 75 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 92. Heat index values as high as 107. South southwest wind 6 to 14 mph, with gusts as high as 21 mph.

    High: 92 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 74. South southwest wind 9 to 13 mph becoming west northwest after midnight. Winds could gust as high as 18 mph.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 87. North wind 10 to 14 mph, with gusts as high as 18 mph.

    High: 87 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64. Northeast wind 6 to 11 mph, with gusts as high as 15 mph.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 84. North northeast wind 6 to 10 mph.

    High: 84 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 62.

    Low: 62 °F

    Clear

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 89. Heat index values as high as 104. West southwest wind around 7 mph.
Tonight
Mostly cloudy, with a low around 75. Southwest wind around 5 mph becoming light and variable.
Monday
Mostly sunny, with a high near 92. Heat index values as high as 107. South southwest wind 6 to 14 mph, with gusts as high as 21 mph.
Monday Night
Mostly clear, with a low around 74. South southwest wind 9 to 13 mph becoming west northwest after midnight. Winds could gust as high as 18 mph.
Tuesday
Sunny, with a high near 87. North wind 10 to 14 mph, with gusts as high as 18 mph.
Tuesday Night
Mostly clear, with a low around 64. Northeast wind 6 to 11 mph, with gusts as high as 15 mph.
Wednesday
Sunny, with a high near 84. North northeast wind 6 to 10 mph.
Wednesday Night
Clear, with a low around 62.
Thursday
Sunny, with a high near 85.
Thursday Night
Partly cloudy, with a low around 65.
Friday
A chance of showers. Partly sunny, with a high near 84.
Friday Night
Partly cloudy, with a low around 66.
Saturday
Mostly sunny, with a high near 84.
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ABOUT THIS FORECAST

 
Point Forecast:
Forsyth IL
 39.93°N 88.96°W (Elev. 650 ft)
12:36 pm CDT Jul 26, 2026
12pm CDT Jul 26, 2026-6pm CDT Aug 1, 2026
 
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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