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.

Mostly Cloudy and Breezy

62°F

17°C

Humidity 78%
Wind Speed SW 24 G 33 mph
Barometer 29.82 in (1009.6 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 9 Mar 12:54 pm CDT
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 73. South southwest wind around 16 mph, with gusts as high as 26 mph.

    High: 73 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 60. South southwest wind 10 to 14 mph, with gusts as high as 25 mph.

    Low: 60 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 78. South southwest wind 9 to 15 mph, with gusts as high as 26 mph.

    High: 78 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 11pm. Low around 51. South southwest wind 14 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 51 °F

    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. Temperature rising to near 61 by 10am, then falling to around 45 during the remainder of the day. Southwest wind 15 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 61 °F⇓

    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 30. Northwest wind 8 to 17 mph, with gusts as high as 26 mph.

    Low: 30 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 48. Northwest wind 6 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 16 mph.

    High: 48 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 41. Breezy.

    Low: 41 °F

    Mostly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Friday

    Friday: Mostly cloudy, with a high near 56.

    High: 56 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 73. South southwest wind around 16 mph, with gusts as high as 26 mph.
Tonight
Partly cloudy, with a low around 60. South southwest wind 10 to 14 mph, with gusts as high as 25 mph.
Tuesday
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 78. South southwest wind 9 to 15 mph, with gusts as high as 26 mph.
Tuesday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 11pm. Low around 51. South southwest wind 14 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
Showers and possibly a thunderstorm. Temperature rising to near 61 by 10am, then falling to around 45 during the remainder of the day. Southwest wind 15 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Wednesday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 30. Northwest wind 8 to 17 mph, with gusts as high as 26 mph.
Thursday
Sunny, with a high near 48. Northwest wind 6 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 16 mph.
Thursday Night
Mostly cloudy, with a low around 41. Breezy.
Friday
Mostly cloudy, with a high near 56.
Friday Night
Mostly cloudy, with a low around 36.
Saturday
Mostly cloudy, with a high near 61.
Saturday Night
A chance of rain. Mostly cloudy, with a low around 47.
Sunday
Rain likely. Mostly cloudy, with a high near 59. Breezy.
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
1:36 pm CDT Mar 9, 2026
Forecast Valid:
1pm CDT Mar 9, 2026-6pm CDT Mar 15, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation