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

59°F

15°C

Humidity 78%
Wind Speed NA
Barometer 30.05 in (1017.3 mb)
Dewpoint 52°F (11°C)
Visibility 9.00 mi
Last update 26 May 2:54 am CDT
Extended Forecast for

Mount Zion IL

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 60. Calm wind.

    Low: 60 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 82. East wind 3 to 8 mph.

    High: 82 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 62. East wind around 6 mph becoming calm after midnight.

    Low: 62 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. Light and variable wind becoming north northeast 5 to 7 mph in the morning.

    High: 82 °F

    Partly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 60. North northeast wind 3 to 8 mph.

    Low: 60 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 81. East northeast wind 10 to 13 mph, with gusts as high as 17 mph.

    High: 81 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 57. East northeast wind 8 to 10 mph, with gusts as high as 15 mph.

    Low: 57 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 78.

    High: 78 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 60. Calm wind.
Tuesday
Mostly cloudy, with a high near 82. East wind 3 to 8 mph.
Tuesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 62. East wind around 6 mph becoming calm after midnight.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. Light and variable wind becoming north northeast 5 to 7 mph in the morning.
Wednesday Night
Mostly clear, with a low around 60. North northeast wind 3 to 8 mph.
Thursday
Mostly sunny, with a high near 81. East northeast wind 10 to 13 mph, with gusts as high as 17 mph.
Thursday Night
Partly cloudy, with a low around 57. East northeast wind 8 to 10 mph, with gusts as high as 15 mph.
Friday
Partly sunny, with a high near 78.
Friday Night
Partly cloudy, with a low around 57.
Saturday
Mostly sunny, with a high near 77.
Saturday Night
Mostly clear, with a low around 56.
Sunday
Sunny, with a high near 76.
Sunday Night
Mostly clear, with a low around 55.
Monday
Sunny, with a high near 78.
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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:
2:51 am CDT May 26, 2026
Forecast Valid:
3am CDT May 26, 2026-6pm CDT Jun 1, 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