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

31°F

-1°C

Humidity 85%
Wind Speed Calm
Barometer 29.92 in (1013.4 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 27 Feb 2:54 am CST
Extended Forecast for

Mount Zion IL

  • Overnight

    Overnight: Clear, with a low around 33. Southwest wind 3 to 5 mph.

    Low: 33 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 67. Breezy, with a southwest wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 32 mph.

    High: 67 °F

    Sunny then
    Sunny and
    Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 34. Southwest wind 7 to 10 mph becoming northeast after midnight. Winds could gust as high as 22 mph.

    Low: 34 °F

    Mostly Clear

  • Saturday

    Saturday: Partly sunny, with a high near 55. East wind 7 to 10 mph, with gusts as high as 16 mph.

    High: 55 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 25. North northeast wind 11 to 15 mph, with gusts as high as 23 mph.

    Low: 25 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 41. East northeast wind around 14 mph, with gusts as high as 21 mph.

    High: 41 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Snow. Low around 25. East northeast wind 11 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.

    Low: 25 °F

    Snow

  • Monday

    Monday: A chance of rain and snow before noon. Mostly cloudy, with a high near 39. Chance of precipitation is 30%.

    High: 39 °F

    Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Monday Night

    Monday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 30.

    Low: 30 °F

    Chance Rain

Detailed Forecast

Overnight
Clear, with a low around 33. Southwest wind 3 to 5 mph.
Friday
Sunny, with a high near 67. Breezy, with a southwest wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 32 mph.
Friday Night
Mostly clear, with a low around 34. Southwest wind 7 to 10 mph becoming northeast after midnight. Winds could gust as high as 22 mph.
Saturday
Partly sunny, with a high near 55. East wind 7 to 10 mph, with gusts as high as 16 mph.
Saturday Night
Mostly cloudy, with a low around 25. North northeast wind 11 to 15 mph, with gusts as high as 23 mph.
Sunday
Mostly cloudy, with a high near 41. East northeast wind around 14 mph, with gusts as high as 21 mph.
Sunday Night
Snow. Low around 25. East northeast wind 11 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.
Monday
A chance of rain and snow before noon. Mostly cloudy, with a high near 39. Chance of precipitation is 30%.
Monday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 30.
Tuesday
Rain likely. Cloudy, with a high near 45. Chance of precipitation is 70%.
Tuesday Night
Rain likely. Cloudy, with a low around 35.
Wednesday
A chance of rain. Cloudy, with a high near 56.
Wednesday Night
Rain likely. Cloudy, with a low around 47.
Thursday
Rain likely. Mostly cloudy, with a high near 62.
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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:
2:41 am CST Feb 27, 2026
Forecast Valid:
3am CST Feb 27, 2026-6pm CST Mar 5, 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