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

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

81°F

27°C

Humidity 57%
Wind Speed SE 6 mph
Barometer 30.02 in (1016.2 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 30 Jul 6:54 pm CDT
Extended Forecast for

Mount Zion IL

  • Tonight

    Tonight: Partly cloudy, with a low around 63. Southeast wind around 5 mph.

    Low: 63 °F

    Partly Cloudy

  • Friday

    Friday: A chance of showers before 1pm, then showers likely and possibly a thunderstorm between 1pm and 3pm, then a chance of showers and thunderstorms after 3pm. Mostly cloudy, with a high near 81. South wind 7 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 81 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms likely, mainly before 3am, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 66. Southeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 66 °F

    Showers
    Likely

  • Saturday

    Saturday: Showers, with thunderstorms also possible after 1pm. High near 76. South wind 11 to 14 mph becoming north in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 76 °F

    Showers

  • Saturday Night

    Saturday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 63. North wind around 15 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 63 °F

    Showers
    Likely

  • Sunday

    Sunday: A 40 percent chance of showers after 1pm. Partly sunny, with a high near 78. North wind around 17 mph, with gusts as high as 25 mph.

    High: 78 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 60. North northeast wind 7 to 14 mph, with gusts as high as 20 mph.

    Low: 60 °F

    Mostly Clear

  • Monday

    Monday: A 30 percent chance of showers after 1pm. Sunny, with a high near 80.

    High: 80 °F

    Sunny then
    Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 63. Southeast wind around 5 mph.
Friday
A chance of showers before 1pm, then showers likely and possibly a thunderstorm between 1pm and 3pm, then a chance of showers and thunderstorms after 3pm. Mostly cloudy, with a high near 81. South wind 7 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers and thunderstorms likely, mainly before 3am, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 66. Southeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
Showers, with thunderstorms also possible after 1pm. High near 76. South wind 11 to 14 mph becoming north in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Showers likely, mainly before 1am. Mostly cloudy, with a low around 63. North wind around 15 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday
A 40 percent chance of showers after 1pm. Partly sunny, with a high near 78. North wind around 17 mph, with gusts as high as 25 mph.
Sunday Night
Mostly clear, with a low around 60. North northeast wind 7 to 14 mph, with gusts as high as 20 mph.
Monday
A 30 percent chance of showers after 1pm. Sunny, with a high near 80.
Monday Night
Mostly clear, with a low around 62.
Tuesday
A 40 percent chance of showers after 1pm. Sunny, with a high near 82.
Tuesday Night
Mostly clear, with a low around 64.
Wednesday
Sunny, with a high near 85.
Wednesday Night
Mostly clear, with a low around 67.
Thursday
Sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Zion IL
 39.77°N 88.89°W (Elev. 650 ft)
Last Update:
6:36 pm CDT Jul 30, 2026
Forecast Valid:
7pm CDT Jul 30, 2026-6pm CDT Aug 6, 2026
 
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