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 W 6 mph
Barometer 29.96 in (1014.8 mb)
Dewpoint 49°F (9°C)
Visibility 2.00 mi
Wind Chill46°F (8°C)
Last update 5 Mar 6:54 am CST
Extended Forecast for

2 Miles ENE Harristown IL

Dense Fog Advisory March 5, 07:34am until March 5, 09:00am
Click here for hazard details and duration
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  •  
    Dense Fog Advisory March 5, 07:34am until March 5, 09:00am

    NOW until 9:00am Thu

    Dense Fog Advisory

  • Today

    High: 60 °F

    Chance
    Showers and
    Areas Dense
    Fog

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms after 3am. Widespread fog, mainly before 3am. Otherwise, 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

    Fog then
    Chance
    T-storms and
    Fog

  • Friday

    Friday: A chance of showers and thunderstorms before noon, then a slight chance of showers. Patchy fog before 9am. Otherwise, cloudy, then gradually becoming mostly 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. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    T-storms and
    Patchy Fog

  • Friday Night

    Friday Night: A chance of showers, then showers and possibly a thunderstorm after midnight. Low around 58. 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: 58 °F

    Breezy.
    Chance
    Showers then
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers before noon. Mostly cloudy, with a temperature rising to near 63 by 9am, then falling to around 53 during the remainder of the day. Southwest wind 13 to 18 mph becoming west northwest in the afternoon. Winds could gust as high as 28 mph.

    High: 63 °F⇓

    Chance
    Showers then
    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 37. Northwest wind 6 to 11 mph, with gusts as high as 17 mph.

    Low: 37 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 61. Southwest wind 6 to 14 mph, with gusts as high as 20 mph.

    High: 61 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

Detailed Forecast

Today
A 30 percent chance of showers, mainly before 11am. Areas of dense fog before noon. Otherwise, cloudy, with a high near 60. Light southwest wind becoming west 5 to 9 mph in the morning.
Tonight
A 50 percent chance of showers and thunderstorms after 3am. Widespread fog, mainly before 3am. Otherwise, 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 chance of showers and thunderstorms before noon, then a slight chance of showers. Patchy fog before 9am. Otherwise, cloudy, then gradually becoming mostly 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. Chance of precipitation is 40%.
Friday Night
A chance of showers, then showers and possibly a thunderstorm after midnight. Low around 58. 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 showers before noon. Mostly cloudy, with a temperature rising to near 63 by 9am, then falling to around 53 during the remainder of the day. Southwest wind 13 to 18 mph becoming west northwest in the afternoon. Winds could gust as high as 28 mph.
Saturday Night
Mostly cloudy, then gradually becoming mostly clear, 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. Southwest wind 6 to 14 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 45.
Monday
Sunny, with a high near 73.
Monday Night
A 30 percent chance of showers and thunderstorms after midnight. Mostly clear, with a low around 57.
Tuesday
Showers. Mostly cloudy, with a high near 72. Breezy.
Tuesday Night
Showers. Cloudy, with a low around 48. Breezy.
Wednesday
Showers likely. Mostly cloudy, with a high near 58. Breezy.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Harristown IL
 39.84°N 89.03°W (Elev. 666 ft)
Last Update:
4:27 am CST Mar 5, 2026
Forecast Valid:
7am 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

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation