National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

67°F

19°C

Humidity 87%
Wind Speed S 8 mph
Barometer 30.01 in (1015.8 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 23 May 9:54 pm CDT
Extended Forecast for

Macon IL

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 3am. Cloudy, with a low around 61. South wind 3 to 5 mph.

    Low: 61 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms, mainly before 10am. Cloudy through mid morning, then gradual clearing, with a high near 78. Light and variable wind becoming north around 6 mph in the afternoon.

    High: 78 °F

    Chance
    T-storms then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 57. Light and variable wind.

    Low: 57 °F

    Increasing
    Clouds

  • Memorial Day

    Memorial Day: Partly sunny, with a high near 80. East southeast wind 5 to 8 mph.

    High: 80 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 62. East southeast wind 5 to 7 mph.

    Low: 62 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 79. East wind 7 to 10 mph, with gusts as high as 15 mph.

    High: 79 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. East southeast wind 7 to 9 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 64 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely, then showers and possibly a thunderstorm after 1pm. High near 79. Chance of precipitation is 80%.

    High: 79 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Showers
    Likely

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms, mainly after 3am. Cloudy, with a low around 61. South wind 3 to 5 mph.
Sunday
A 40 percent chance of showers and thunderstorms, mainly before 10am. Cloudy through mid morning, then gradual clearing, with a high near 78. Light and variable wind becoming north around 6 mph in the afternoon.
Sunday Night
Increasing clouds, with a low around 57. Light and variable wind.
Memorial Day
Partly sunny, with a high near 80. East southeast wind 5 to 8 mph.
Monday Night
Mostly cloudy, with a low around 62. East southeast wind 5 to 7 mph.
Tuesday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 79. East wind 7 to 10 mph, with gusts as high as 15 mph.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. East southeast wind 7 to 9 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
Showers likely, then showers and possibly a thunderstorm after 1pm. High near 79. Chance of precipitation is 80%.
Wednesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Thursday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 61.
Friday
A chance of showers. Partly sunny, with a high near 77.
Friday Night
Mostly cloudy, with a low around 56.
Saturday
Mostly sunny, with a high near 76.
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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:
7:46 pm CDT May 23, 2026
Forecast Valid:
10pm CDT May 23, 2026-6pm CDT May 30, 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