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

67°F

19°C

Humidity 41%
Wind Speed SE 13 mph
Barometer 30.26 in (1024.8 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Last update 11 Apr 3:54 pm CDT
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 58. Southeast wind 8 to 11 mph, with gusts as high as 21 mph.

    Low: 58 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of showers, mainly after 5pm. Partly sunny, with a high near 80. Breezy, with a south southwest wind 13 to 22 mph, with gusts as high as 36 mph.

    High: 80 °F

    Partly Sunny
    then Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Showers likely, then showers and possibly a thunderstorm after 10pm. Low around 63. South wind around 18 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 63 °F

    Showers

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 81. South southwest wind 14 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.

    High: 81 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 66. South wind 14 to 16 mph, with gusts as high as 25 mph.

    Low: 66 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. South southwest wind 13 to 18 mph, with gusts as high as 29 mph.

    High: 85 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. South southwest wind 15 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 65 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 78. Chance of precipitation is 70%.

    High: 78 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 61. Chance of precipitation is 70%.

    Low: 61 °F

    Showers
    Likely

Detailed Forecast

Tonight
Mostly cloudy, with a low around 58. Southeast wind 8 to 11 mph, with gusts as high as 21 mph.
Sunday
A 30 percent chance of showers, mainly after 5pm. Partly sunny, with a high near 80. Breezy, with a south southwest wind 13 to 22 mph, with gusts as high as 36 mph.
Sunday Night
Showers likely, then showers and possibly a thunderstorm after 10pm. Low around 63. South wind around 18 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 81. South southwest wind 14 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.
Monday Night
Mostly cloudy, with a low around 66. South wind 14 to 16 mph, with gusts as high as 25 mph.
Tuesday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. South southwest wind 13 to 18 mph, with gusts as high as 29 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. South southwest wind 15 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 78. Chance of precipitation is 70%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 61. Chance of precipitation is 70%.
Thursday
A 40 percent chance of showers. Partly sunny, with a high near 78.
Thursday Night
Mostly clear, with a low around 59.
Friday
A chance of showers. Mostly sunny, with a high near 82.
Friday Night
Showers likely. Mostly cloudy, with a low around 53.
Saturday
A chance of showers. Mostly cloudy, with a high near 67.
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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:
2:36 pm CDT Apr 11, 2026
Forecast Valid:
4pm CDT Apr 11, 2026-6pm CDT Apr 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