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.

Partly Cloudy and Windy

70°F

21°C

Humidity 66%
Wind Speed SW 29 G 41 mph
Barometer 29.86 in (1010.5 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 31 Mar 9:54 am CDT
Extended Forecast for

Decatur IL

  • Today

    Today: A 40 percent chance of showers and thunderstorms, mainly after 4pm. Mostly cloudy, with a high near 80. Breezy, with a south southwest wind 17 to 20 mph, with gusts as high as 32 mph.

    High: 80 °F

    Chance
    T-storms and
    Breezy

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 10pm. Low around 49. Southwest wind 9 to 11 mph becoming northeast after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 49 °F

    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before 1pm, then rain and possibly a thunderstorm after 1pm. High near 63. East northeast wind 11 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 63 °F

    Showers

  • Wednesday Night

    Wednesday Night: Rain likely. Mostly cloudy, with a low around 57. East southeast wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 57 °F

    Rain Likely

  • Thursday

    Thursday: A chance of rain, then rain and possibly a thunderstorm after 1pm. High near 75. Breezy, with a south wind 16 to 26 mph, with gusts as high as 39 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 75 °F

    Breezy.
    Chance Rain
    then Rain

  • Thursday Night

    Thursday Night: Rain and possibly a thunderstorm before 1am, then a chance of rain. Low around 57. Southwest wind 10 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 57 °F

    Rain

  • Friday

    Friday: A 40 percent chance of rain after 1pm. Partly sunny, with a high near 76. South southwest wind 8 to 11 mph, with gusts as high as 20 mph.

    High: 76 °F

    Mostly Cloudy
    then Chance
    Rain

  • Friday Night

    Friday Night: A chance of rain and thunderstorms, then rain and possibly a thunderstorm after 1am. Low around 58. Chance of precipitation is 80%.

    Low: 58 °F

    Chance
    T-storms then
    Rain

  • Saturday

    Saturday: Rain and possibly a thunderstorm before 1pm, then rain likely. High near 68. Breezy. Chance of precipitation is 80%.

    High: 68 °F

    Rain and
    Breezy

Detailed Forecast

Today
A 40 percent chance of showers and thunderstorms, mainly after 4pm. Mostly cloudy, with a high near 80. Breezy, with a south southwest wind 17 to 20 mph, with gusts as high as 32 mph.
Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 10pm. Low around 49. Southwest wind 9 to 11 mph becoming northeast after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday
Showers and possibly a thunderstorm before 1pm, then rain and possibly a thunderstorm after 1pm. High near 63. East northeast wind 11 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 57. East southeast wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
A chance of rain, then rain and possibly a thunderstorm after 1pm. High near 75. Breezy, with a south wind 16 to 26 mph, with gusts as high as 39 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Rain and possibly a thunderstorm before 1am, then a chance of rain. Low around 57. Southwest wind 10 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
A 40 percent chance of rain after 1pm. Partly sunny, with a high near 76. South southwest wind 8 to 11 mph, with gusts as high as 20 mph.
Friday Night
A chance of rain and thunderstorms, then rain and possibly a thunderstorm after 1am. Low around 58. Chance of precipitation is 80%.
Saturday
Rain and possibly a thunderstorm before 1pm, then rain likely. High near 68. Breezy. Chance of precipitation is 80%.
Saturday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 39.
Sunday
Partly sunny, with a high near 52.
Sunday Night
Mostly clear, with a low around 33.
Monday
Sunny, with a high near 57.
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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:
9:36 am CDT Mar 31, 2026
Forecast Valid:
10am CDT Mar 31, 2026-6pm CDT Apr 6, 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