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

75°F

24°C

Humidity 50%
Wind Speed Vrbl 6 mph
Barometer 30.12 in (1019.5 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 24 Aug 11:54 am CDT
Extended Forecast for

Macon IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 79. Light and variable wind.

    High: 79 °F

    Mostly Sunny

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, mostly cloudy, then gradually becoming clear, with a low around 57. East wind 3 to 5 mph.

    Low: 57 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, sunny, with a high near 82. Southeast wind 3 to 6 mph.

    High: 82 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 63. Southeast wind around 6 mph.

    Low: 63 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 86. South wind 5 to 10 mph becoming west southwest in the afternoon. Winds could gust as high as 15 mph.

    High: 86 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly clear, with a low around 63. West southwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 63 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: Sunny, with a high near 85. Northwest wind 5 to 9 mph.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 61.

    Low: 61 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 79. Light and variable wind.
Tonight
Patchy fog after 3am. Otherwise, mostly cloudy, then gradually becoming clear, with a low around 57. East wind 3 to 5 mph.
Tuesday
Patchy fog before 8am. Otherwise, sunny, with a high near 82. Southeast wind 3 to 6 mph.
Tuesday Night
Partly cloudy, with a low around 63. Southeast wind around 6 mph.
Wednesday
Mostly sunny, with a high near 86. South wind 5 to 10 mph becoming west southwest in the afternoon. Winds could gust as high as 15 mph.
Wednesday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly clear, with a low around 63. West southwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 30%.
Thursday
Sunny, with a high near 85. Northwest wind 5 to 9 mph.
Thursday Night
Clear, with a low around 61.
Friday
Sunny, with a high near 84.
Friday Night
Mostly clear, with a low around 63.
Saturday
Partly sunny, with a high near 86.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 67.
Sunday
Partly sunny, with a high near 89.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Macon IL
 39.71°N 89.01°W (Elev. 699 ft)
Last Update:
12:06 pm CDT Aug 24, 2026
Forecast Valid:
12pm CDT Aug 24, 2026-6pm CDT Aug 30, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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