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.

Overcast

82°F

28°C

Humidity 88%
Wind Speed Vrbl 3 mph
Barometer 29.93 in (1012.8 mb)
Dewpoint 78°F (26°C)
Visibility 7.00 mi
Heat Index91°F (33°C)
Last update 26 Jul 1:54 pm CDT
Extended Forecast for

Mount Zion IL

Heat Advisory July 26, 02:37pm until July 27, 09:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 26, 02:37pm until July 27, 09:00pm

    NOW until 9:00pm Mon

    Heat Advisory

  • This Afternoon

    High: 90 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 74. South wind 3 to 5 mph.

    Low: 74 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 92. Heat index values as high as 108. South wind 6 to 13 mph, with gusts as high as 20 mph.

    High: 92 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 74. South southwest wind 8 to 11 mph becoming northwest after midnight. Winds could gust as high as 17 mph.

    Low: 74 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 86. North wind 10 to 13 mph, with gusts as high as 18 mph.

    High: 86 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 63. North northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 63 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 84. North northeast wind 6 to 9 mph.

    High: 84 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 63.

    Low: 63 °F

    Clear

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 90. Heat index values as high as 104. West southwest wind around 7 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 74. South wind 3 to 5 mph.
Monday
Mostly sunny, with a high near 92. Heat index values as high as 108. South wind 6 to 13 mph, with gusts as high as 20 mph.
Monday Night
Partly cloudy, with a low around 74. South southwest wind 8 to 11 mph becoming northwest after midnight. Winds could gust as high as 17 mph.
Tuesday
Mostly sunny, with a high near 86. North wind 10 to 13 mph, with gusts as high as 18 mph.
Tuesday Night
Mostly clear, with a low around 63. North northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Wednesday
Sunny, with a high near 84. North northeast wind 6 to 9 mph.
Wednesday Night
Clear, with a low around 63.
Thursday
Sunny, with a high near 85.
Thursday Night
Partly cloudy, with a low around 66.
Friday
A chance of showers. Partly sunny, with a high near 83.
Friday Night
A chance of showers. Mostly cloudy, with a low around 66.
Saturday
A chance of showers. Mostly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mount Zion IL
 39.77°N 88.89°W (Elev. 650 ft)
Last Update:
1:46 pm CDT Jul 26, 2026
Forecast Valid:
2pm CDT Jul 26, 2026-6pm CDT Aug 1, 2026
 
Forecast Discussion
 
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Additional Resources

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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