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

61°F

16°C

Humidity 78%
Wind Speed S 10 mph
Barometer 30.10 in (1019.2 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 12 Apr 2:54 am CDT
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 58. South wind 11 to 13 mph, with gusts as high as 21 mph.

    Low: 58 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 10 percent chance of showers after 5pm. Increasing clouds, with a high near 80. Breezy, with a south southwest wind 14 to 22 mph, with gusts as high as 37 mph.

    High: 80 °F

    Partly Sunny
    then Slight
    Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely before 2am, then showers likely and possibly a thunderstorm between 2am and 3am, then a chance of showers and thunderstorms after 3am. Cloudy, with a low around 62. Breezy, with a south wind 13 to 21 mph, with gusts as high as 32 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 62 °F

    Showers
    Likely and
    Breezy

  • Monday

    Monday: A 30 percent chance of showers before 7am. Mostly cloudy, with a high near 81. South southwest wind 13 to 17 mph, with gusts as high as 26 mph.

    High: 81 °F

    Chance
    Showers then
    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 67. South southwest wind 14 to 17 mph, with gusts as high as 28 mph.

    Low: 67 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 83. Southwest wind 13 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 50%.

    High: 83 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely before 10pm, then showers likely and possibly a thunderstorm after 10pm. Mostly cloudy, with a low around 66. South southwest wind around 14 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 66 °F

    T-storms
    Likely then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely, then showers and possibly a thunderstorm after 1pm. High near 78. Chance of precipitation is 90%.

    High: 78 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.

    Low: 62 °F

    Showers
    Likely

Detailed Forecast

Overnight
Mostly cloudy, with a low around 58. South wind 11 to 13 mph, with gusts as high as 21 mph.
Sunday
A 10 percent chance of showers after 5pm. Increasing clouds, with a high near 80. Breezy, with a south southwest wind 14 to 22 mph, with gusts as high as 37 mph.
Sunday Night
Showers and thunderstorms likely before 2am, then showers likely and possibly a thunderstorm between 2am and 3am, then a chance of showers and thunderstorms after 3am. Cloudy, with a low around 62. Breezy, with a south wind 13 to 21 mph, with gusts as high as 32 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
A 30 percent chance of showers before 7am. Mostly cloudy, with a high near 81. South southwest wind 13 to 17 mph, with gusts as high as 26 mph.
Monday Night
Mostly cloudy, with a low around 67. South southwest wind 14 to 17 mph, with gusts as high as 28 mph.
Tuesday
A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 83. Southwest wind 13 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 50%.
Tuesday Night
Showers and thunderstorms likely before 10pm, then showers likely and possibly a thunderstorm after 10pm. Mostly cloudy, with a low around 66. South southwest wind around 14 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
Showers likely, then showers and possibly a thunderstorm after 1pm. High near 78. Chance of precipitation is 90%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.
Thursday
A 40 percent chance of showers. Partly sunny, with a high near 80.
Thursday Night
Mostly clear, with a low around 59.
Friday
A chance of showers. Mostly sunny, with a high near 84.
Friday Night
Showers likely. Mostly cloudy, with a low around 61.
Saturday
Showers and thunderstorms likely. Partly sunny, with a high near 76.
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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:
1:16 am CDT Apr 12, 2026
Forecast Valid:
3am CDT Apr 12, 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