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.

Overcast

48°F

9°C

Humidity 86%
Wind Speed NW 14 G 24 mph
Barometer 29.94 in (1013.8 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 7 Mar 3:54 pm CST
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 36. West northwest wind 6 to 13 mph, with gusts as high as 22 mph.

    Low: 36 °F

    Mostly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 63. Southwest wind 7 to 14 mph, with gusts as high as 23 mph.

    High: 63 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 44. South southwest wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 44 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 73. South southwest wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 73 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 58. South wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 58 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 78. South southwest wind 10 to 17 mph, with gusts as high as 29 mph.

    High: 78 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 50. Breezy, with a south southwest wind 17 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 50 °F

    Showers and
    Breezy

  • Wednesday

    Wednesday: Showers. High near 64. Breezy. Chance of precipitation is 90%.

    High: 64 °F

    Breezy.
    Showers then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 30. Blustery.

    Low: 30 °F

    Mostly Cloudy
    then Mostly
    Clear and
    Blustery

Detailed Forecast

Tonight
Mostly cloudy, with a low around 36. West northwest wind 6 to 13 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 63. Southwest wind 7 to 14 mph, with gusts as high as 23 mph.
Sunday Night
Clear, with a low around 44. South southwest wind 10 to 13 mph, with gusts as high as 21 mph.
Monday
Sunny, with a high near 73. South southwest wind 10 to 15 mph, with gusts as high as 24 mph.
Monday Night
Mostly clear, with a low around 58. South wind 10 to 13 mph, with gusts as high as 21 mph.
Tuesday
A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 78. South southwest wind 10 to 17 mph, with gusts as high as 29 mph.
Tuesday Night
Showers and possibly a thunderstorm. Low around 50. Breezy, with a south southwest wind 17 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday
Showers. High near 64. Breezy. Chance of precipitation is 90%.
Wednesday Night
Partly cloudy, with a low around 30. Blustery.
Thursday
Mostly sunny, with a high near 48.
Thursday Night
Mostly cloudy, with a low around 39. Breezy.
Friday
Mostly cloudy, with a high near 62. Breezy.
Friday Night
Mostly cloudy, with a low around 34.
Saturday
Mostly cloudy, with a high near 50.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.86°N 88.94°W (Elev. 682 ft)
Last Update:
3:36 pm CST Mar 7, 2026
Forecast Valid:
4pm CST Mar 7, 2026-6pm CDT Mar 14, 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