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

95°F

35°C

Humidity 53%
Wind Speed SW 10 mph
Barometer 30.03 in (1016.2 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index107°F (42°C)
Last update 16 Aug 4:54 pm CDT
Extended Forecast for

Decatur 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: 95 °F

    Isolated
    T-storms

  • Tonight

    Tonight: Isolated showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 2am. Mostly clear, with a low around 74. South southwest wind 3 to 6 mph. Chance of precipitation is 20%.

    Low: 74 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Heat index values as high as 103. Light and variable wind.

    High: 94 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 74. Light east southeast wind.

    Low: 74 °F

    Partly Cloudy

  • Monday

    Monday: Sunny and hot, with a high near 95. Light and variable wind becoming south around 6 mph in the morning.

    High: 95 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 74. South wind 3 to 5 mph.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 95. Light and variable wind becoming west 5 to 7 mph in the morning.

    High: 95 °F

    Hot

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Isolated showers and thunderstorms. Sunny and hot, with a high near 95. Heat index values as high as 110. Southwest wind around 7 mph. Chance of precipitation is 20%.
Tonight
Isolated showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 2am. Mostly clear, with a low around 74. South southwest wind 3 to 6 mph. Chance of precipitation is 20%.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Heat index values as high as 103. Light and variable wind.
Sunday Night
Partly cloudy, with a low around 74. Light east southeast wind.
Monday
Sunny and hot, with a high near 95. Light and variable wind becoming south around 6 mph in the morning.
Monday Night
Mostly clear, with a low around 74. South wind 3 to 5 mph.
Tuesday
Mostly sunny and hot, with a high near 95. Light and variable wind becoming west 5 to 7 mph in the morning.
Tuesday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 70.
Wednesday
Partly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 64.
Thursday
Sunny, with a high near 84.
Thursday Night
Mostly clear, with a low around 64.
Friday
Sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 65.
Saturday
Sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
5:41 pm CDT Aug 16, 2025
Forecast Valid:
5pm CDT Aug 16, 2025-6pm CDT Aug 23, 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