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

91°F

33°C

Humidity 56%
Wind Speed SW 14 mph
Barometer 30.17 in (1021.1 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 23 Jun 11:54 am CDT
Extended Forecast for

Decatur IL

Heat Advisory June 23, 12:04pm until June 26, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 23, 12:04pm until June 26, 07:00pm

    NOW until 7:00pm Thu

    Heat Advisory

  • This Afternoon

    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 16 mph.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Heat index values as high as 101. Southwest wind 6 to 8 mph.

    High: 94 °F

    Mostly Sunny
    then Slight
    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

This Afternoon
Mostly sunny and hot, with a high near 95. Heat index values as high as 101. South southwest wind around 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 16 mph.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Heat index values as high as 101. 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
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
11:25 am CDT Jun 23, 2025
Forecast Valid:
12pm CDT Jun 23, 2025-6pm CDT Jun 29, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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