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.

Light Rain

60°F

16°C

Humidity 90%
Wind Speed SW 10 mph
Barometer 29.87 in (1011.1 mb)
Dewpoint 57°F (14°C)
Visibility 9.00 mi
Last update 7 Mar 4:54 am CST
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: Showers and possibly a thunderstorm. Low around 60. Southwest wind around 15 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 60 °F

    Showers

  • Saturday

    Saturday: Showers and thunderstorms before 11am, then a slight chance of showers between 11am and 1pm. Temperature rising to near 64 by 10am, then falling to around 51 during the remainder of the day. West wind 14 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 64 °F⇓

    Showers then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 35. West northwest wind 6 to 13 mph, with gusts as high as 20 mph.

    Low: 35 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 62. Southwest wind 6 to 14 mph, with gusts as high as 21 mph.

    High: 62 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 45. South southwest wind around 11 mph, with gusts as high as 21 mph.

    Low: 45 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 73. South southwest wind 11 to 15 mph, with gusts as high as 25 mph.

    High: 73 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 56. South southwest wind around 10 mph, with gusts as high as 18 mph.

    Low: 56 °F

    Mostly Clear

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 76. Chance of precipitation is 70%.

    High: 76 °F

    Mostly Sunny
    then Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers, with thunderstorms also possible after midnight. Low around 48. Breezy. Chance of precipitation is 90%.

    Low: 48 °F

    Showers and
    Breezy

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Low around 60. Southwest wind around 15 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers and thunderstorms before 11am, then a slight chance of showers between 11am and 1pm. Temperature rising to near 64 by 10am, then falling to around 51 during the remainder of the day. West wind 14 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 35. West northwest wind 6 to 13 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 62. Southwest wind 6 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Clear, with a low around 45. South southwest wind around 11 mph, with gusts as high as 21 mph.
Monday
Sunny, with a high near 73. South southwest wind 11 to 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 56. South southwest wind around 10 mph, with gusts as high as 18 mph.
Tuesday
Showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 76. Chance of precipitation is 70%.
Tuesday Night
Showers, with thunderstorms also possible after midnight. Low around 48. Breezy. Chance of precipitation is 90%.
Wednesday
Showers, mainly before noon. High near 60. Breezy. Chance of precipitation is 80%.
Wednesday Night
Mostly cloudy, with a low around 31.
Thursday
Mostly sunny, with a high near 49.
Thursday Night
Mostly cloudy, with a low around 38.
Friday
Mostly cloudy, with a high near 60. Breezy.
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
4:26 am CST Mar 7, 2026
Forecast Valid:
5am CST Mar 7, 2026-6pm CDT Mar 13, 2026
 
Forecast Discussion
 
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Additional Resources

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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