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

65°F

18°C

Humidity 87%
Wind Speed S 20 mph
Barometer 29.88 in (1011.2 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 6 Mar 10:54 pm CST
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: A slight chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Low around 60. South wind around 18 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 60 °F

    Showers

  • Saturday

    Saturday: Showers and thunderstorms before noon, then a slight chance of showers between noon and 1pm. Temperature rising to near 64 by 10am, then falling to around 51 during the remainder of the day. Southwest wind 14 to 18 mph becoming west northwest in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 64 °F⇓

    Showers then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 35. West northwest wind 6 to 13 mph, with gusts as high as 22 mph.

    Low: 35 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 62. Southwest wind 6 to 14 mph, with gusts as high as 22 mph.

    High: 62 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 45. South southwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 45 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 74. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 74 °F

    Sunny

  • Monday Night

    Monday Night: A 30 percent chance of showers after midnight. Mostly clear, with a low around 55. South southwest wind 9 to 11 mph, with gusts as high as 20 mph.

    Low: 55 °F

    Mostly Clear
    then Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers, then showers and possibly a thunderstorm after noon. High near 74. Chance of precipitation is 80%.

    High: 74 °F

    Chance
    Showers then
    Showers

  • Tuesday Night

    Tuesday Night: Showers. Low around 46. Chance of precipitation is 90%.

    Low: 46 °F

    Showers

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Low around 60. South wind around 18 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
Showers and thunderstorms before noon, then a slight chance of showers between noon and 1pm. Temperature rising to near 64 by 10am, then falling to around 51 during the remainder of the day. Southwest wind 14 to 18 mph becoming west northwest in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Partly cloudy, with a low around 35. West northwest wind 6 to 13 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 62. Southwest wind 6 to 14 mph, with gusts as high as 22 mph.
Sunday Night
Clear, with a low around 45. South southwest wind around 10 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 74. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Monday Night
A 30 percent chance of showers after midnight. Mostly clear, with a low around 55. South southwest wind 9 to 11 mph, with gusts as high as 20 mph.
Tuesday
A chance of showers, then showers and possibly a thunderstorm after noon. High near 74. Chance of precipitation is 80%.
Tuesday Night
Showers. Low around 46. Chance of precipitation is 90%.
Wednesday
Showers likely, mainly before noon. Cloudy, with a high near 54. Chance of precipitation is 60%.
Wednesday Night
Mostly cloudy, with a low around 32.
Thursday
Sunny, with a high near 53.
Thursday Night
Mostly cloudy, with a low around 38.
Friday
Partly sunny, with a high near 62.
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
9:51 pm CST Mar 6, 2026
Forecast Valid:
11pm CST Mar 6, 2026-6pm CDT Mar 13, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation