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

71°F

22°C

Humidity 90%
Wind Speed S 7 mph
Barometer 30.02 in (1016.0 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 25 Jul 12:54 pm CDT
Extended Forecast for

Mount Zion IL

Heat Advisory July 26, 12:00pm until July 27, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • This Afternoon

    This Afternoon: A 20 percent chance of showers before 2pm. Mostly cloudy, with a high near 80. South southwest wind around 8 mph.

    High: 80 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Mostly cloudy, with a low around 69. Light south southeast wind.

    Low: 69 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 90. Heat index values as high as 103. Calm wind becoming south southwest around 6 mph in the morning.

    High: 90 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 73. South wind 5 to 7 mph.

    Low: 73 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny and hot, with a high near 95. Southwest wind 9 to 16 mph, with gusts as high as 24 mph.

    High: 95 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 74. Southwest wind 7 to 13 mph becoming west northwest after midnight. Winds could gust as high as 17 mph.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 90. North wind 8 to 11 mph, with gusts as high as 18 mph.

    High: 90 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers before 2pm. Mostly cloudy, with a high near 80. South southwest wind around 8 mph.
Tonight
Mostly cloudy, with a low around 69. Light south southeast wind.
Sunday
Partly sunny, with a high near 90. Heat index values as high as 103. Calm wind becoming south southwest around 6 mph in the morning.
Sunday Night
Partly cloudy, with a low around 73. South wind 5 to 7 mph.
Monday
Mostly sunny and hot, with a high near 95. Southwest wind 9 to 16 mph, with gusts as high as 24 mph.
Monday Night
Mostly clear, with a low around 74. Southwest wind 7 to 13 mph becoming west northwest after midnight. Winds could gust as high as 17 mph.
Tuesday
Sunny, with a high near 90. North wind 8 to 11 mph, with gusts as high as 18 mph.
Tuesday Night
Mostly clear, with a low around 65.
Wednesday
Sunny, with a high near 88.
Wednesday Night
Mostly clear, with a low around 66.
Thursday
Sunny, with a high near 88.
Thursday Night
Mostly clear, with a low around 68.
Friday
Mostly sunny, with a high near 88.
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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:
12:36 pm CDT Jul 25, 2026
Forecast Valid:
1pm CDT Jul 25, 2026-6pm CDT Jul 31, 2026
 
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