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

78°F

26°C

Humidity 85%
Wind Speed E 3 mph
Barometer 29.90 in (1012.1 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 19 Sep 7:54 pm CDT
Extended Forecast for

Decatur Airport IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 70. South southeast wind 3 to 7 mph.

    Low: 70 °F

    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Northwest wind 6 to 11 mph becoming northeast in the morning. Winds could gust as high as 16 mph. Chance of precipitation is 30%.

    High: 84 °F

    Partly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. Northeast wind 9 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.

    Low: 60 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Monday

    Monday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 70. East northeast wind 14 to 16 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 70 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 54. East northeast wind 11 to 14 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 67. Northeast wind around 15 mph, with gusts as high as 21 mph.

    High: 67 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 52. North northeast wind 7 to 13 mph, with gusts as high as 18 mph.

    Low: 52 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 69.

    High: 69 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 70. South southeast wind 3 to 7 mph.
Sunday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Northwest wind 6 to 11 mph becoming northeast in the morning. Winds could gust as high as 16 mph. Chance of precipitation is 30%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. Northeast wind 9 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.
Monday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 70. East northeast wind 14 to 16 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 54. East northeast wind 11 to 14 mph, with gusts as high as 20 mph.
Tuesday
Mostly cloudy, with a high near 67. Northeast wind around 15 mph, with gusts as high as 21 mph.
Tuesday Night
Mostly cloudy, with a low around 52. North northeast wind 7 to 13 mph, with gusts as high as 18 mph.
Wednesday
Partly sunny, with a high near 69.
Wednesday Night
Partly cloudy, with a low around 53.
Thursday
Partly sunny, with a high near 72.
Thursday Night
Mostly cloudy, with a low around 55.
Friday
Partly sunny, with a high near 75.
Friday Night
Partly cloudy, with a low around 54.
Saturday
Mostly sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur Airport IL
 39.84°N 88.88°W (Elev. 650 ft)
Last Update:
7:56 pm CDT Sep 19, 2026
Forecast Valid:
7pm CDT Sep 19, 2026-6pm CDT Sep 26, 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