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 with Haze

68°F

20°C

Humidity 61%
Wind Speed NW 8 mph
Barometer 30.09 in (1018.8 mb)
Dewpoint 54°F (12°C)
Visibility 5.00 mi
Last update 28 Sep 12:54 pm CDT
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 78. Light north northeast wind.

    High: 78 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 53. Northeast wind around 5 mph becoming calm in the evening.

    Low: 53 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 82. Calm wind becoming south 5 to 7 mph in the morning.

    High: 82 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 63. South southeast wind 5 to 8 mph.

    Low: 63 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 86. South wind 8 to 11 mph, with gusts as high as 17 mph.

    High: 86 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 70. South wind 8 to 14 mph, with gusts as high as 18 mph.

    Low: 70 °F

    Mostly Cloudy

  • Thursday

    Thursday: Showers likely, mainly after 1pm. Mostly cloudy, with a high near 82. South southwest wind 10 to 13 mph, with gusts as high as 17 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    High: 82 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely. Cloudy, with a low around 64. Chance of precipitation is 70%.

    Low: 64 °F

    Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers. Mostly cloudy, with a high near 72. Chance of precipitation is 60%.

    High: 72 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Sunny, with a high near 78. Light north northeast wind.
Tonight
Clear, with a low around 53. Northeast wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 82. Calm wind becoming south 5 to 7 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 63. South southeast wind 5 to 8 mph.
Wednesday
Partly sunny, with a high near 86. South wind 8 to 11 mph, with gusts as high as 17 mph.
Wednesday Night
Mostly cloudy, with a low around 70. South wind 8 to 14 mph, with gusts as high as 18 mph.
Thursday
Showers likely, mainly after 1pm. Mostly cloudy, with a high near 82. South southwest wind 10 to 13 mph, with gusts as high as 17 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Showers likely. Cloudy, with a low around 64. Chance of precipitation is 70%.
Friday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers. Mostly cloudy, with a high near 72. Chance of precipitation is 60%.
Friday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 59.
Saturday
A chance of showers. Partly sunny, with a high near 70.
Saturday Night
Mostly cloudy, with a low around 57.
Sunday
Mostly sunny, with a high near 70.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.86°N 88.94°W (Elev. 682 ft)
Last Update:
12:04 pm CDT Sep 28, 2026
Forecast Valid:
1pm CDT Sep 28, 2026-6pm CDT Oct 4, 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