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.

Rain Fog/Mist

37°F

3°C

Humidity 100%
Wind Speed E 8 mph
Barometer 30.08 in (1019.1 mb)
Dewpoint 37°F (3°C)
Visibility 2.00 mi
Wind Chill31°F (-1°C)
Last update 3 Mar 6:54 am CST
Extended Forecast for

Decatur IL

  • Today

    Today: Showers and thunderstorms before 1pm, then showers and possibly a thunderstorm, mainly after 1pm. Areas of fog. High near 47. Light and variable wind becoming northeast around 6 mph in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 47 °F

    Showers and
    Areas Fog

  • Tonight

    Tonight: Showers and possibly a thunderstorm. Areas of fog. Low around 42. East northeast wind 6 to 8 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    Low: 42 °F

    Showers and
    Areas Fog

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. Patchy fog before noon. High near 55. East southeast wind 5 to 8 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 55 °F

    Showers and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 50. East southeast wind 6 to 8 mph becoming south southwest after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 50 °F

    Showers

  • Thursday

    Thursday: Showers likely, mainly before noon. Mostly cloudy, with a high near 63. West southwest wind 7 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 63 °F

    Showers
    Likely then
    Chance
    Showers

  • Thursday Night

    Thursday Night: A 50 percent chance of showers after midnight. Mostly cloudy, with a low around 50. West southwest wind 5 to 9 mph becoming southeast after midnight. Winds could gust as high as 15 mph.

    Low: 50 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers likely, mainly before noon. Mostly cloudy, with a high near 74. South wind 10 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 74 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers, then showers and possibly a thunderstorm after midnight. Low around 57. Chance of precipitation is 80%.

    Low: 57 °F

    Chance
    Showers then
    Showers

  • Saturday

    Saturday: Showers likely before noon. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.

    High: 66 °F

    Showers
    Likely then
    Mostly Cloudy

Detailed Forecast

Today
Showers and thunderstorms before 1pm, then showers and possibly a thunderstorm, mainly after 1pm. Areas of fog. High near 47. Light and variable wind becoming northeast around 6 mph in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Showers and possibly a thunderstorm. Areas of fog. Low around 42. East northeast wind 6 to 8 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Wednesday
Showers and possibly a thunderstorm. Patchy fog before noon. High near 55. East southeast wind 5 to 8 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
Showers and possibly a thunderstorm. Low around 50. East southeast wind 6 to 8 mph becoming south southwest after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Showers likely, mainly before noon. Mostly cloudy, with a high near 63. West southwest wind 7 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
A 50 percent chance of showers after midnight. Mostly cloudy, with a low around 50. West southwest wind 5 to 9 mph becoming southeast after midnight. Winds could gust as high as 15 mph.
Friday
Showers likely, mainly before noon. Mostly cloudy, with a high near 74. South wind 10 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
A chance of showers, then showers and possibly a thunderstorm after midnight. Low around 57. Chance of precipitation is 80%.
Saturday
Showers likely before noon. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.
Saturday Night
Partly cloudy, with a low around 41.
Sunday
Sunny, with a high near 63.
Sunday Night
Mostly clear, with a low around 45.
Monday
Sunny, with a high near 68.
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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:
5:11 am CST Mar 3, 2026
Forecast Valid:
7am CST Mar 3, 2026-6pm CDT Mar 9, 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