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.

Light Rain Fog

48°F

9°C

Humidity 100%
Wind Speed Calm
Barometer 30.00 in (1016.2 mb)
Dewpoint 48°F (9°C)
Visibility 0.25 mi
Last update 4 Mar 7:54 pm CST
Extended Forecast for

Decatur IL

Dense Fog Advisory until March 5, 06:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until March 5, 06:00am

    NOW until 6:00am Thu

    Dense Fog Advisory

  • Tonight

    Low: 48 °F

    Chance
    T-storms and
    Patchy Fog
    then Showers
    and Areas Fog

  • Thursday

    Thursday: Showers and thunderstorms before 11am, then a slight chance of showers between 11am and noon. Patchy fog before noon. High near 63. South southwest wind 5 to 7 mph becoming west in the afternoon. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 63 °F

    Showers and
    Patchy Fog
    then Mostly
    Cloudy

  • Thursday Night

    Thursday Night: A slight chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 51. Calm wind becoming south southeast 5 to 9 mph after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 51 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms. Partly sunny, with a high near 76. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.

    High: 76 °F

    Chance
    T-storms then
    Chance
    Showers and
    Breezy

  • Friday Night

    Friday Night: A chance of showers before 9pm, then a chance of showers and thunderstorms between 9pm and midnight, then showers and possibly a thunderstorm after midnight. Low around 55. South wind 14 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 55 °F

    Chance
    T-storms then
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers before noon. Mostly cloudy, with a high near 64. Southwest wind 9 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph.

    High: 64 °F

    Chance
    Showers then
    Mostly Cloudy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 38. West northwest wind 5 to 8 mph becoming southwest after midnight.

    Low: 38 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

Detailed Forecast

Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Patchy fog. Low around 48. Light and variable wind becoming south southeast around 6 mph after midnight. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Showers and thunderstorms before 11am, then a slight chance of showers between 11am and noon. Patchy fog before noon. High near 63. South southwest wind 5 to 7 mph becoming west in the afternoon. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A slight chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 51. Calm wind becoming south southeast 5 to 9 mph after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 76. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.
Friday Night
A chance of showers before 9pm, then a chance of showers and thunderstorms between 9pm and midnight, then showers and possibly a thunderstorm after midnight. Low around 55. South wind 14 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
A 50 percent chance of showers before noon. Mostly cloudy, with a high near 64. Southwest wind 9 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph.
Saturday Night
Partly cloudy, with a low around 38. West northwest wind 5 to 8 mph becoming southwest after midnight.
Sunday
Sunny, with a high near 62.
Sunday Night
Mostly clear, with a low around 45.
Monday
Sunny, with a high near 73.
Monday Night
A chance of rain and thunderstorms. Mostly clear, with a low around 58.
Tuesday
Rain. Mostly cloudy, with a high near 73.
Tuesday Night
Rain. Mostly cloudy, with a low around 44.
Wednesday
Rain likely. Mostly cloudy, with a high near 54.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
6:36 pm CST Mar 4, 2026
Forecast Valid:
8pm CST Mar 4, 2026-6pm CDT Mar 11, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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