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/Mist

51°F

11°C

Humidity 100%
Wind Speed SW 7 mph
Barometer 29.96 in (1014.6 mb)
Dewpoint 51°F (11°C)
Visibility 5.00 mi
Wind Chill48°F (9°C)
Last update 5 Mar 1:54 am CST
Extended Forecast for

2 Miles ENE Harristown IL

Dense Fog Advisory March 5, 02:14am until March 5, 09:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory March 5, 02:14am until March 5, 09:00am

    NOW until 9:00am Thu

    Dense Fog Advisory

  • Overnight

    Low: 48 °F

    Showers
    Likely and
    Dense Fog

  • Thursday

    Thursday: Rain likely, mainly before 10am. Areas of fog before noon. Otherwise, mostly cloudy, with a high near 61. Light southwest wind becoming west 5 to 9 mph in the morning. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 61 °F

    Rain Likely
    and Areas Fog
    then Chance
    Rain

  • Thursday Night

    Thursday Night: A 50 percent chance of rain and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 50. Light and variable wind becoming south southeast 5 to 10 mph after midnight. Winds could gust as high as 16 mph.

    Low: 50 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: A 40 percent chance of rain before noon. Partly sunny, with a high near 76. Breezy, with a south wind 10 to 15 mph increasing to 18 to 23 mph in the afternoon. Winds could gust as high as 33 mph.

    High: 76 °F

    Breezy.
    Chance Rain
    then Partly
    Sunny

  • Friday Night

    Friday Night: A chance of rain, then rain and possibly a thunderstorm after midnight. Low around 56. Breezy, with a south wind 16 to 22 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 56 °F

    Breezy.
    Chance Rain
    then Rain

  • Saturday

    Saturday: A 50 percent chance of rain before noon. Mostly cloudy, with a high near 65. Southwest wind 13 to 18 mph becoming west northwest in the afternoon. Winds could gust as high as 28 mph.

    High: 65 °F

    Chance Rain
    then Mostly
    Cloudy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 37. Northwest wind 6 to 11 mph, with gusts as high as 17 mph.

    Low: 37 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

Detailed Forecast

Overnight
Showers likely and possibly a thunderstorm. Widespread dense fog. Otherwise, mostly cloudy, with a low around 48. Light and variable wind becoming west around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
Rain likely, mainly before 10am. Areas of fog before noon. Otherwise, mostly cloudy, with a high near 61. Light southwest wind becoming west 5 to 9 mph in the morning. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
A 50 percent chance of rain and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 50. Light and variable wind becoming south southeast 5 to 10 mph after midnight. Winds could gust as high as 16 mph.
Friday
A 40 percent chance of rain before noon. Partly sunny, with a high near 76. Breezy, with a south wind 10 to 15 mph increasing to 18 to 23 mph in the afternoon. Winds could gust as high as 33 mph.
Friday Night
A chance of rain, then rain and possibly a thunderstorm after midnight. Low around 56. Breezy, with a south wind 16 to 22 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
A 50 percent chance of rain before noon. Mostly cloudy, with a high near 65. Southwest wind 13 to 18 mph becoming west northwest in the afternoon. Winds could gust as high as 28 mph.
Saturday Night
Partly cloudy, with a low around 37. Northwest wind 6 to 11 mph, with gusts as high as 17 mph.
Sunday
Sunny, with a high near 61.
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 57.
Tuesday
Rain. Mostly cloudy, with a high near 72. Breezy.
Tuesday Night
Rain. Cloudy, with a low around 48. Breezy.
Wednesday
Rain likely. Mostly cloudy, with a high near 58. Breezy.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Harristown IL
 39.84°N 89.03°W (Elev. 666 ft)
Last Update:
2:07 am CST Mar 5, 2026
Forecast Valid:
2am CST Mar 5, 2026-6pm CDT Mar 11, 2026
 
Forecast Discussion
 
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Additional Resources

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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