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Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

88°F

31°C

Humidity 39%
Wind Speed SW 18 mph
Barometer 29.89 in (1011.5 mb)
Dewpoint 60°F (16°C)
Visibility 8.00 mi
Heat Index88°F (31°C)
Last update 12 Oct 1:54 pm CDT
Extended Forecast for

Decatur IL

  • Columbus Day

    Columbus Day: Sunny, with a high near 91. Southwest wind around 14 mph, with gusts as high as 23 mph.

    High: 91 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 70. South southwest wind 9 to 13 mph, with gusts as high as 18 mph.

    Low: 70 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 92. Southwest wind 10 to 13 mph, with gusts as high as 18 mph.

    High: 92 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Increasing clouds, with a low around 70. South southwest wind 5 to 7 mph. Chance of precipitation is 50%.

    Low: 70 °F

    Mostly Clear
    then Chance
    T-storms

  • Wednesday

    Wednesday: Showers. High near 80. Light and variable wind becoming north around 6 mph in the morning. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 80 °F

    Showers

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 61. Northeast wind 7 to 9 mph.

    Low: 61 °F

    Chance
    Showers

  • Thursday

    Thursday: Showers, with thunderstorms also possible after 1pm. High near 76. East northeast wind around 8 mph becoming south southwest in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 76 °F

    Showers

  • Thursday Night

    Thursday Night: A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 50. Breezy.

    Low: 50 °F

    Chance
    Showers and
    Breezy

  • Friday

    Friday: Mostly sunny, with a high near 62. Breezy.

    High: 62 °F

    Mostly Sunny
    and Breezy

Detailed Forecast

Columbus Day
Sunny, with a high near 91. Southwest wind around 14 mph, with gusts as high as 23 mph.
Tonight
Mostly clear, with a low around 70. South southwest wind 9 to 13 mph, with gusts as high as 18 mph.
Tuesday
Sunny, with a high near 92. Southwest wind 10 to 13 mph, with gusts as high as 18 mph.
Tuesday Night
A chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Increasing clouds, with a low around 70. South southwest wind 5 to 7 mph. Chance of precipitation is 50%.
Wednesday
Showers. High near 80. Light and variable wind becoming north around 6 mph in the morning. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 61. Northeast wind 7 to 9 mph.
Thursday
Showers, with thunderstorms also possible after 1pm. High near 76. East northeast wind around 8 mph becoming south southwest in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 50. Breezy.
Friday
Mostly sunny, with a high near 62. Breezy.
Friday Night
Mostly clear, with a low around 38.
Saturday
Sunny, with a high near 61.
Saturday Night
Mostly clear, with a low around 38.
Sunday
Sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
1:26 pm CDT Oct 12, 2026
Forecast Valid:
2pm CDT Oct 12, 2026-6pm CDT Oct 18, 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