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

94°F

34°C

Humidity 60%
Wind Speed SW 9 mph
Barometer 30.09 in (1018.0 mb)
Dewpoint 78°F (26°C)
Visibility 10.00 mi
Heat Index110°F (43°C)
Last update 16 Aug 1:54 pm CDT
Extended Forecast for

3 Miles WSW Forsyth IL

Heat Advisory until August 17, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until August 17, 08:00pm

    NOW until 8:00pm Sun

    Heat Advisory

  • This Afternoon

    High: 93 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 2am. Mostly clear, with a low around 73. South wind 5 to 7 mph. Chance of precipitation is 20%.

    Low: 73 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 102. Light and variable wind becoming south southwest around 5 mph.

    High: 93 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 74. Calm wind becoming east southeast around 5 mph after midnight.

    Low: 74 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 94. Southeast wind 5 to 7 mph becoming south southwest in the afternoon.

    High: 94 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 73. South wind around 6 mph.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 93. South southwest wind 5 to 8 mph becoming west in the afternoon.

    High: 93 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 69.

    Low: 69 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 93. Heat index values as high as 103. Southwest wind around 8 mph.
Tonight
A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 2am. Mostly clear, with a low around 73. South wind 5 to 7 mph. Chance of precipitation is 20%.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 102. Light and variable wind becoming south southwest around 5 mph.
Sunday Night
Partly cloudy, with a low around 74. Calm wind becoming east southeast around 5 mph after midnight.
Monday
Sunny, with a high near 94. Southeast wind 5 to 7 mph becoming south southwest in the afternoon.
Monday Night
Mostly clear, with a low around 73. South wind around 6 mph.
Tuesday
Mostly sunny, with a high near 93. South southwest wind 5 to 8 mph becoming west in the afternoon.
Tuesday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 69.
Wednesday
Partly sunny, with a high near 83.
Wednesday Night
Partly cloudy, with a low around 64.
Thursday
Sunny, with a high near 84.
Thursday Night
Mostly clear, with a low around 63.
Friday
Sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Forsyth IL
 39.89°N 89.02°W (Elev. 656 ft)
Last Update:
1:25 pm CDT Aug 16, 2025
Forecast Valid:
2pm CDT Aug 16, 2025-6pm CDT Aug 22, 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