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

67°F

19°C

Humidity 81%
Wind Speed SW 5 mph
Barometer 30.01 in (1015.8 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 12 Jun 11:54 pm CDT
Extended Forecast for

Decatur Airport IL

  • Overnight

    Overnight: Mostly clear, with a low around 59. Calm wind becoming south around 5 mph.

    Low: 59 °F

    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 82. South southwest wind 7 to 13 mph, with gusts as high as 20 mph.

    High: 82 °F

    Partly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: Showers and thunderstorms before 4am, then a chance of showers. Low around 63. South wind 7 to 11 mph becoming west northwest after midnight. Winds could gust as high as 16 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 63 °F

    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 72. Northwest wind 15 to 17 mph, with gusts as high as 25 mph.

    High: 72 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 53. Northwest wind 8 to 13 mph becoming light after midnight. Winds could gust as high as 18 mph.

    Low: 53 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 73. Light west wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 15 mph.

    High: 73 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 54. Southwest wind 3 to 6 mph.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 77.

    High: 77 °F

    Sunny then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 58.

    Low: 58 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 59. Calm wind becoming south around 5 mph.
Saturday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 82. South southwest wind 7 to 13 mph, with gusts as high as 20 mph.
Saturday Night
Showers and thunderstorms before 4am, then a chance of showers. Low around 63. South wind 7 to 11 mph becoming west northwest after midnight. Winds could gust as high as 16 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday
Mostly sunny, with a high near 72. Northwest wind 15 to 17 mph, with gusts as high as 25 mph.
Sunday Night
Partly cloudy, with a low around 53. Northwest wind 8 to 13 mph becoming light after midnight. Winds could gust as high as 18 mph.
Monday
Mostly sunny, with a high near 73. Light west wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 15 mph.
Monday Night
Mostly clear, with a low around 54. Southwest wind 3 to 6 mph.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 77.
Tuesday Night
A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 58.
Wednesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 80. Breezy. Chance of precipitation is 60%.
Wednesday Night
Showers likely and possibly a thunderstorm. Partly cloudy, with a low around 64. Breezy.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 80.
Thursday Night
A chance of showers. Partly cloudy, with a low around 60.
Juneteenth
Mostly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur Airport IL
 39.84°N 88.85°W (Elev. 686 ft)
Last Update:
12:17 am CDT Jun 13, 2026
Forecast Valid:
12am CDT Jun 13, 2026-6pm CDT Jun 19, 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