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 and Windy

77°F

25°C

Humidity 39%
Wind Speed SW 28 G 39 mph
Barometer 29.94 in (1013.5 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 21 Apr 3:54 pm CDT
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 59. Southwest wind 10 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.

    Low: 59 °F

    Scattered
    T-storms

  • Wednesday

    Wednesday: Scattered showers and thunderstorms before 7am. Mostly sunny, with a high near 75. Southwest wind around 10 mph, with gusts as high as 17 mph. Chance of precipitation is 30%.

    High: 75 °F

    Scattered
    T-storms then
    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. South wind around 7 mph.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 80. South wind 8 to 17 mph, with gusts as high as 28 mph.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62. South wind around 15 mph, with gusts as high as 24 mph.

    Low: 62 °F

    Partly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 75. South wind 11 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 75 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 53. West wind around 7 mph becoming north after midnight.

    Low: 53 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

Detailed Forecast

Tonight
Scattered showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 59. Southwest wind 10 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.
Wednesday
Scattered showers and thunderstorms before 7am. Mostly sunny, with a high near 75. Southwest wind around 10 mph, with gusts as high as 17 mph. Chance of precipitation is 30%.
Wednesday Night
Mostly clear, with a low around 57. South wind around 7 mph.
Thursday
Sunny, with a high near 80. South wind 8 to 17 mph, with gusts as high as 28 mph.
Thursday Night
A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62. South wind around 15 mph, with gusts as high as 24 mph.
Friday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 75. South wind 11 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 53. West wind around 7 mph becoming north after midnight.
Saturday
Mostly sunny, with a high near 73.
Saturday Night
Partly cloudy, with a low around 50.
Sunday
Mostly sunny, with a high near 75.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 56.
Monday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 74. Breezy.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 52.
Tuesday
Mostly sunny, 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:
3:36 pm CDT Apr 21, 2026
Forecast Valid:
4pm CDT Apr 21, 2026-6pm CDT Apr 28, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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