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

34°F

1°C

Humidity 73%
Wind Speed S 13 mph
Barometer 30.01 in (1017.0 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 4 Jan 7:54 pm CST
Extended Forecast for

Macon IL

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 32. South wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 32 °F

    Decreasing
    Clouds

  • Monday

    Monday: Partly sunny, with a high near 50. Southwest wind 8 to 10 mph, with gusts as high as 17 mph.

    High: 50 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41. South southeast wind 7 to 11 mph, with gusts as high as 18 mph.

    Low: 41 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 56. South southwest wind 9 to 15 mph becoming west in the afternoon. Winds could gust as high as 21 mph.

    High: 56 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 33. West northwest wind 3 to 7 mph.

    Low: 33 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 56. Light and variable wind becoming south southwest 5 to 8 mph in the morning.

    High: 56 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 42. South southeast wind 8 to 10 mph, with gusts as high as 15 mph.

    Low: 42 °F

    Partly Cloudy

  • Thursday

    Thursday: Rain likely, mainly after noon. Mostly cloudy, with a high near 55. Chance of precipitation is 60%.

    High: 55 °F

    Chance Rain
    then Rain
    Likely

  • Thursday Night

    Thursday Night: Rain likely, mainly before midnight. Mostly cloudy, with a low around 41. Chance of precipitation is 70%.

    Low: 41 °F

    Rain Likely

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming clear, with a low around 32. South wind 10 to 13 mph, with gusts as high as 21 mph.
Monday
Partly sunny, with a high near 50. Southwest wind 8 to 10 mph, with gusts as high as 17 mph.
Monday Night
Mostly cloudy, with a low around 41. South southeast wind 7 to 11 mph, with gusts as high as 18 mph.
Tuesday
Mostly sunny, with a high near 56. South southwest wind 9 to 15 mph becoming west in the afternoon. Winds could gust as high as 21 mph.
Tuesday Night
Partly cloudy, with a low around 33. West northwest wind 3 to 7 mph.
Wednesday
Sunny, with a high near 56. Light and variable wind becoming south southwest 5 to 8 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 42. South southeast wind 8 to 10 mph, with gusts as high as 15 mph.
Thursday
Rain likely, mainly after noon. Mostly cloudy, with a high near 55. Chance of precipitation is 60%.
Thursday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 41. Chance of precipitation is 70%.
Friday
A 40 percent chance of rain. Partly sunny, with a high near 49.
Friday Night
Mostly cloudy, with a low around 30.
Saturday
Partly sunny, with a high near 40.
Saturday Night
Partly cloudy, with a low around 20.
Sunday
Mostly sunny, with a high near 34.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Macon IL
 39.71°N 89.01°W (Elev. 699 ft)
Last Update:
4:46 pm CST Jan 4, 2026
Forecast Valid:
8pm CST Jan 4, 2026-6pm CST Jan 11, 2026
 
Forecast Discussion
 
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Additional Resources

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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