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

40°F

4°C

Humidity 53%
Wind Speed SE 10 mph
Barometer 30.36 in (1028.8 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 24 Mar 9:54 am CDT
Extended Forecast for

Macon IL

  • Today

    Today: Partly sunny, with a high near 58. South southeast wind 8 to 11 mph.

    High: 58 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 40. Southeast wind 6 to 8 mph.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 72. South southwest wind 8 to 15 mph, with gusts as high as 24 mph.

    High: 72 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 58. South wind 11 to 14 mph, with gusts as high as 21 mph.

    Low: 58 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 85. Southwest wind 14 to 18 mph, with gusts as high as 28 mph.

    High: 85 °F

    Sunny then
    Chance
    Showers

  • Thursday Night

    Thursday Night: Showers and thunderstorms before 10pm, then showers and possibly a thunderstorm between 10pm and 1am, then rain and possibly a thunderstorm after 1am. Low around 37. Breezy, with a west northwest wind 15 to 22 mph becoming north northeast in the evening. Winds could gust as high as 29 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 37 °F

    T-storms and
    Breezy

  • Friday

    Friday: Partly sunny, with a high near 48. Breezy, with a north northeast wind 17 to 20 mph, with gusts as high as 28 mph.

    High: 48 °F

    Partly Sunny
    and Breezy
    then Partly
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 27.

    Low: 27 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

Detailed Forecast

Today
Partly sunny, with a high near 58. South southeast wind 8 to 11 mph.
Tonight
Mostly cloudy, with a low around 40. Southeast wind 6 to 8 mph.
Wednesday
Mostly sunny, with a high near 72. South southwest wind 8 to 15 mph, with gusts as high as 24 mph.
Wednesday Night
Partly cloudy, with a low around 58. South wind 11 to 14 mph, with gusts as high as 21 mph.
Thursday
A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 85. Southwest wind 14 to 18 mph, with gusts as high as 28 mph.
Thursday Night
Showers and thunderstorms before 10pm, then showers and possibly a thunderstorm between 10pm and 1am, then rain and possibly a thunderstorm after 1am. Low around 37. Breezy, with a west northwest wind 15 to 22 mph becoming north northeast in the evening. Winds could gust as high as 29 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Partly sunny, with a high near 48. Breezy, with a north northeast wind 17 to 20 mph, with gusts as high as 28 mph.
Friday Night
Mostly clear, with a low around 27.
Saturday
Sunny, with a high near 52.
Saturday Night
Partly cloudy, with a low around 36.
Sunday
Partly sunny, with a high near 60.
Sunday Night
Partly cloudy, with a low around 44.
Monday
Mostly sunny, with a high near 72.
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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:
10:02 am CDT Mar 24, 2026
Forecast Valid:
10am CDT Mar 24, 2026-6pm CDT Mar 30, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation