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.

Fog/Mist

37°F

3°C

Humidity 100%
Wind Speed E 6 mph
Barometer 30.12 in (1020.5 mb)
Dewpoint 37°F (3°C)
Visibility 0.75 mi
Wind Chill32°F (0°C)
Last update 3 Mar 2:54 am CST
Extended Forecast for

Macon IL

  • Overnight

    Overnight: Showers likely, mainly after 5am. Patchy fog. Otherwise, cloudy, with a low around 37. East southeast wind around 6 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 37 °F

    Showers
    Likely and
    Patchy Fog

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. Areas of fog. High near 48. East southeast wind around 6 mph becoming northeast in the afternoon. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 48 °F

    Showers and
    Areas Fog

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Areas of fog. Low around 42. East northeast wind 6 to 9 mph, with gusts as high as 15 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    Low: 42 °F

    Showers and
    Areas Fog

  • Wednesday

    Wednesday: Showers. Patchy fog before noon. High near 56. East southeast wind 6 to 9 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 56 °F

    Showers and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: Rain and possibly a thunderstorm. Low around 50. East southeast wind 6 to 9 mph becoming south southwest after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 50 °F

    Rain

  • Thursday

    Thursday: Rain likely, mainly before noon. Mostly cloudy, with a high near 63. Southwest wind 7 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 63 °F

    Rain Likely

  • Thursday Night

    Thursday Night: A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 50. West southwest wind 6 to 10 mph becoming southeast after midnight. Winds could gust as high as 16 mph.

    Low: 50 °F

    Partly Cloudy
    then Chance
    Rain

  • Friday

    Friday: Rain likely, mainly before noon. Mostly cloudy, with a high near 74. Breezy. Chance of precipitation is 60%.

    High: 74 °F

    Rain Likely
    and Breezy

  • Friday Night

    Friday Night: A chance of rain, then rain and possibly a thunderstorm after midnight. Low around 56. Chance of precipitation is 80%.

    Low: 56 °F

    Chance Rain
    then Rain

Detailed Forecast

Overnight
Showers likely, mainly after 5am. Patchy fog. Otherwise, cloudy, with a low around 37. East southeast wind around 6 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
Showers and possibly a thunderstorm. Areas of fog. High near 48. East southeast wind around 6 mph becoming northeast in the afternoon. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night
Showers and possibly a thunderstorm. Areas of fog. Low around 42. East northeast wind 6 to 9 mph, with gusts as high as 15 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Wednesday
Showers. Patchy fog before noon. High near 56. East southeast wind 6 to 9 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday Night
Rain and possibly a thunderstorm. Low around 50. East southeast wind 6 to 9 mph becoming south southwest after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Rain likely, mainly before noon. Mostly cloudy, with a high near 63. Southwest wind 7 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 50. West southwest wind 6 to 10 mph becoming southeast after midnight. Winds could gust as high as 16 mph.
Friday
Rain likely, mainly before noon. Mostly cloudy, with a high near 74. Breezy. Chance of precipitation is 60%.
Friday Night
A chance of rain, then rain and possibly a thunderstorm after midnight. Low around 56. Chance of precipitation is 80%.
Saturday
Rain likely before noon. Mostly cloudy, with a high near 66. Chance of precipitation is 70%.
Saturday Night
Partly cloudy, with a low around 40.
Sunday
Sunny, with a high near 62.
Sunday Night
Mostly clear, with a low around 45.
Monday
Sunny, with a high near 68.
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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:
2:21 am CST Mar 3, 2026
Forecast Valid:
3am CST Mar 3, 2026-6pm CDT Mar 9, 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