National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat in the East; Critical Fire Weather in the Southwest

Dangerous, record-breaking heat will intensify across most of the central and eastern U.S this week. Heat indices will likely exceed 100 degrees. Heat is likely to continue across the eastern U.S. through the Independence Day holiday weekend. Critical fire weather conditions will continue today and likely Tuesday across portions of the Four Corners and northern High Plains. Read More >

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

A Few Clouds

87°F

31°C

Humidity 70%
Wind Speed SW 10 mph
Barometer 29.99 in (1014.6 mb)
Dewpoint 76°F (24°C)
Visibility 9.00 mi
Heat Index98°F (37°C)
Last update 29 Jun 11:54 am CDT
Extended Forecast for

2 Miles SE Mount Zion IL

Heat Advisory until July 3, 12:00am
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until July 3, 12:00am

    NOW until 12:00am Fri

    Heat Advisory

  • This Afternoon

    High: 91 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 74. South wind 9 to 13 mph, with gusts as high as 23 mph.

    Low: 74 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 94. Heat index values as high as 105. South southwest wind 9 to 14 mph, with gusts as high as 21 mph.

    High: 94 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 74. South southwest wind 8 to 11 mph, with gusts as high as 21 mph.

    Low: 74 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 93. South southwest wind 7 to 11 mph, with gusts as high as 17 mph.

    High: 93 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 74. South wind 7 to 11 mph, with gusts as high as 16 mph.

    Low: 74 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 93. South southwest wind 7 to 10 mph, with gusts as high as 15 mph.

    High: 93 °F

    Sunny

  • Thursday Night

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

    Low: 74 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Partly sunny, with a high near 91. Heat index values as high as 102. South wind 13 to 16 mph, with gusts as high as 23 mph.
Tonight
Partly cloudy, with a low around 74. South wind 9 to 13 mph, with gusts as high as 23 mph.
Tuesday
Mostly sunny, with a high near 94. Heat index values as high as 105. South southwest wind 9 to 14 mph, with gusts as high as 21 mph.
Tuesday Night
Clear, with a low around 74. South southwest wind 8 to 11 mph, with gusts as high as 21 mph.
Wednesday
Sunny, with a high near 93. South southwest wind 7 to 11 mph, with gusts as high as 17 mph.
Wednesday Night
Clear, with a low around 74. South wind 7 to 11 mph, with gusts as high as 16 mph.
Thursday
Sunny, with a high near 93. South southwest wind 7 to 10 mph, with gusts as high as 15 mph.
Thursday Night
Mostly clear, with a low around 74.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Friday Night
Partly cloudy, with a low around 73.
Independence Day
A chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Saturday Night
Mostly clear, with a low around 71.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SE Mount Zion IL
 39.75°N 88.86°W (Elev. 709 ft)
Last Update:
11:36 am CDT Jun 29, 2026
Forecast Valid:
12pm CDT Jun 29, 2026-6pm CDT Jul 5, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation