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.

A Few Clouds

78°F

26°C

Humidity 50%
Wind Speed NE 9 mph
Barometer 30.15 in (1020.5 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 3 Aug 12:54 pm CDT
Extended Forecast for

Macon IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 81. East northeast wind around 8 mph.

    High: 81 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 61. East northeast wind around 7 mph.

    Low: 61 °F

    Partly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. East wind 6 to 8 mph.

    High: 80 °F

    Partly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A chance of thunderstorms before 7pm. Mostly cloudy, with a low around 64. East wind around 6 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 82. East southeast wind 3 to 6 mph.

    High: 82 °F

    Partly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 65. Light east southeast wind.

    Low: 65 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 85. Light south southeast wind.

    High: 85 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 81. East northeast wind around 8 mph.
Tonight
Partly cloudy, with a low around 61. East northeast wind around 7 mph.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. East wind 6 to 8 mph.
Monday Night
A chance of thunderstorms before 7pm. Mostly cloudy, with a low around 64. East wind around 6 mph becoming calm in the evening. Chance of precipitation is 30%.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 82. East southeast wind 3 to 6 mph.
Tuesday Night
Mostly clear, with a low around 65. Light east southeast wind.
Wednesday
Mostly sunny, with a high near 85. Light south southeast wind.
Wednesday Night
Mostly clear, with a low around 66.
Thursday
Sunny, with a high near 86.
Thursday Night
Mostly clear, with a low around 68.
Friday
Sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 70.
Saturday
Sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Macon IL
 39.71°N 89.01°W (Elev. 699 ft)
Last Update:
1:40 pm CDT Aug 3, 2025
Forecast Valid:
2pm CDT Aug 3, 2025-6pm CDT Aug 9, 2025
 
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