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

88°F

31°C

Humidity 66%
Wind Speed SW 14 mph
Barometer 30.18 in (1021.4 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index98°F (37°C)
Last update 23 Jun 9:54 am CDT
Extended Forecast for

Decatur IL

Heat Advisory June 23, 10:41am until June 26, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 23, 10:41am until June 26, 07:00pm

    NOW until 7:00pm Thu

    Heat Advisory

  • Today

    High: 95 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 76. South southwest wind 6 to 11 mph, with gusts as high as 17 mph.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Heat index values as high as 101. West southwest wind 6 to 8 mph.

    High: 94 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 75. South southwest wind 3 to 6 mph.

    Low: 75 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92. West southwest wind 3 to 6 mph.

    High: 92 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 75. South wind 3 to 5 mph.

    Low: 75 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. Southwest wind 5 to 8 mph.

    High: 93 °F

    Sunny then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

Detailed Forecast

Today
Sunny and hot, with a high near 95. Heat index values as high as 101. Southwest wind 11 to 13 mph, with gusts as high as 22 mph.
Tonight
Mostly clear, with a low around 76. South southwest wind 6 to 11 mph, with gusts as high as 17 mph.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Heat index values as high as 101. West southwest wind 6 to 8 mph.
Tuesday Night
Partly cloudy, with a low around 75. South southwest wind 3 to 6 mph.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92. West southwest wind 3 to 6 mph.
Wednesday Night
Partly cloudy, with a low around 75. South wind 3 to 5 mph.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. Southwest wind 5 to 8 mph.
Thursday Night
Mostly clear, with a low around 74.
Friday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91.
Friday Night
Partly cloudy, with a low around 73.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Saturday Night
Partly cloudy, with a low around 73.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
9:43 am CDT Jun 23, 2025
Forecast Valid:
10am CDT Jun 23, 2025-6pm CDT Jun 29, 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