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

76°F

24°C

Humidity 88%
Wind Speed S 9 mph
Barometer 30.07 in (1017.6 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 14 Aug 12:54 pm CDT
Extended Forecast for

Mount Zion IL

Flood Watch August 14, 01:31pm until August 14, 04:00pm
Flood Advisory until August 14, 01:45pm
Click here for hazard details and duration
Flood Watch
...
  •  
    Flood Watch August 14, 01:31pm until August 14, 04:00pm
    Flood Advisory until August 14, 01:45pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • This Afternoon

    High: 86 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 73. East wind 6 to 8 mph, with gusts as high as 16 mph.

    Low: 73 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms before noon, then a slight chance of showers between noon and 1pm. Partly sunny, with a high near 92. Heat index values as high as 106. South wind 7 to 9 mph, with gusts as high as 15 mph. Chance of precipitation is 50%.

    High: 92 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 74. Southwest wind around 7 mph.

    Low: 74 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 90. West northwest wind 7 to 9 mph, with gusts as high as 15 mph.

    High: 90 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 30 percent chance of showers after 1am. Partly cloudy, with a low around 68. North northwest wind 5 to 8 mph.

    Low: 68 °F

    Partly Cloudy
    then Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 84. North wind 5 to 8 mph.

    High: 84 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms, mainly before 2pm. Mostly cloudy, with a high near 86. South southeast wind around 7 mph.
Tonight
A 20 percent chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 73. East wind 6 to 8 mph, with gusts as high as 16 mph.
Saturday
A chance of showers and thunderstorms before noon, then a slight chance of showers between noon and 1pm. Partly sunny, with a high near 92. Heat index values as high as 106. South wind 7 to 9 mph, with gusts as high as 15 mph. Chance of precipitation is 50%.
Saturday Night
Partly cloudy, with a low around 74. Southwest wind around 7 mph.
Sunday
Partly sunny, with a high near 90. West northwest wind 7 to 9 mph, with gusts as high as 15 mph.
Sunday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 68. North northwest wind 5 to 8 mph.
Monday
Mostly sunny, with a high near 84. North wind 5 to 8 mph.
Monday Night
Partly cloudy, with a low around 63.
Tuesday
Sunny, with a high near 85.
Tuesday Night
Mostly clear, with a low around 68.
Wednesday
Partly sunny, with a high near 87.
Wednesday Night
Mostly cloudy, with a low around 65.
Thursday
Mostly sunny, with a high near 80.
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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:
1:26 pm CDT Aug 14, 2026
Forecast Valid:
1pm CDT Aug 14, 2026-6pm CDT Aug 20, 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