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.

Fog/Mist

49°F

9°C

Humidity 100%
Wind Speed Calm
Barometer 29.96 in (1014.7 mb)
Dewpoint 49°F (9°C)
Visibility 2.50 mi
Last update 4 Mar 10:54 pm CST
Extended Forecast for

Decatur IL

Dense Fog Advisory March 4, 11:18pm until March 5, 06:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory March 4, 11:18pm until March 5, 06:00am

    NOW until 6:00am Thu

    Dense Fog Advisory

  • Tonight

    Low: 48 °F

    Rain and
    Areas Dense
    Fog

  • Thursday

    Thursday: Rain likely, mainly before 10am. Patchy fog before noon. Otherwise, mostly cloudy, with a high near 63. West wind 5 to 8 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 63 °F

    Rain Likely
    and Patchy
    Fog then
    Chance Rain

  • Thursday Night

    Thursday Night: A 40 percent chance of rain and thunderstorms, mainly after 5am. 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.

    Low: 51 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: A chance of rain before noon, then a chance of showers after noon. 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 Rain
    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
Rain and thunderstorms likely, then rain and possibly a thunderstorm after 3am. Areas of dense fog. Low around 48. Light and variable wind becoming south around 5 mph after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Rain likely, mainly before 10am. Patchy fog before noon. Otherwise, mostly cloudy, with a high near 63. West wind 5 to 8 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
A 40 percent chance of rain and thunderstorms, mainly after 5am. 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.
Friday
A chance of rain before noon, then a chance of showers after noon. 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.
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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:
10:06 pm CST Mar 4, 2026
Forecast Valid:
11pm CST Mar 4, 2026-6pm CDT Mar 11, 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