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.

Overcast

68°F

20°C

Humidity 65%
Wind Speed SE 9 mph
Barometer 29.93 in (1013.2 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 22 May 3:54 pm CDT
Extended Forecast for

Mount Zion IL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers. Cloudy, with a high near 69. East wind around 11 mph, with gusts as high as 16 mph.

    High: 69 °F

    Chance
    Showers

  • Tonight

    Tonight: A 50 percent chance of showers, mainly before midnight. Cloudy, with a low around 59. East wind 5 to 9 mph becoming light and variable. Winds could gust as high as 15 mph.

    Low: 59 °F

    Chance
    Showers then
    Slight Chance
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 77. North northwest wind 5 to 7 mph becoming west in the afternoon.

    High: 77 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Showers likely, mainly after 4am. Mostly cloudy, with a low around 59. West wind around 5 mph becoming light and variable in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 59 °F

    Chance
    Showers then
    Showers
    Likely

  • Sunday

    Sunday: Showers likely before 1pm. Partly sunny, with a high near 77. Light and variable wind becoming north northwest around 6 mph in the afternoon. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 77 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 58. Light east northeast wind.

    Low: 58 °F

    Partly Cloudy

  • Memorial Day

    Memorial Day: Mostly sunny, with a high near 81. East wind 3 to 6 mph.

    High: 81 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 80.

    High: 80 °F

    Partly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers. Cloudy, with a high near 69. East wind around 11 mph, with gusts as high as 16 mph.
Tonight
A 50 percent chance of showers, mainly before midnight. Cloudy, with a low around 59. East wind 5 to 9 mph becoming light and variable. Winds could gust as high as 15 mph.
Saturday
Partly sunny, with a high near 77. North northwest wind 5 to 7 mph becoming west in the afternoon.
Saturday Night
Showers likely, mainly after 4am. Mostly cloudy, with a low around 59. West wind around 5 mph becoming light and variable in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Sunday
Showers likely before 1pm. Partly sunny, with a high near 77. Light and variable wind becoming north northwest around 6 mph in the afternoon. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Sunday Night
Partly cloudy, with a low around 58. Light east northeast wind.
Memorial Day
Mostly sunny, with a high near 81. East wind 3 to 6 mph.
Monday Night
Partly cloudy, with a low around 61.
Tuesday
Partly sunny, with a high near 80.
Tuesday Night
A 50 percent chance of showers after 1am. Mostly cloudy, with a low around 64.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 80.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 80.
Thursday Night
Partly cloudy, with a low around 62.
Friday
Mostly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mount Zion IL
 39.79°N 88.89°W (Elev. 650 ft)
Last Update:
3:36 pm CDT May 22, 2026
Forecast Valid:
4pm CDT May 22, 2026-6pm CDT May 29, 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