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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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
10:06 pm CST Mar 4, 2026
11pm CST Mar 4, 2026-6pm CDT Mar 11, 2026
 
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Additional Resources

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