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

48°F

9°C

Humidity 100%
Wind Speed Calm
Barometer 30.00 in (1016.3 mb)
Dewpoint 48°F (9°C)
Visibility 0.25 mi
Last update 4 Mar 6:54 pm CST
Extended Forecast for

4 Miles N Forsyth 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: 49 °F

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

  • Thursday

    Thursday: Showers, mainly before 8am. Patchy fog before noon. High near 62. South wind 5 to 9 mph becoming west in the afternoon. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 62 °F

    Showers and
    Patchy Fog
    then Mostly
    Cloudy

  • Thursday Night

    Thursday Night: A slight chance of showers, then a chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 49. Light and variable wind becoming southeast 5 to 10 mph in the evening. Winds could gust as high as 16 mph. Chance of precipitation is 50%.

    Low: 49 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms. Partly sunny, with a high near 76. Breezy, with a south wind 13 to 23 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.

    High: 76 °F

    Breezy.
    Chance
    T-storms then
    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before midnight, then showers and possibly a thunderstorm between midnight and 3am, then showers after 3am. Low around 54. Breezy, with a south wind 17 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 54 °F

    Breezy.
    Chance
    T-storms then
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers before noon. Mostly cloudy, with a high near 63. Southwest wind 13 to 18 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph.

    High: 63 °F

    Chance
    Showers then
    Mostly Cloudy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 37. West northwest wind 6 to 10 mph, with gusts as high as 16 mph.

    Low: 37 °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 1am. Patchy fog. Low around 49. East wind 5 to 8 mph becoming south southeast after midnight. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Showers, mainly before 8am. Patchy fog before noon. High near 62. South wind 5 to 9 mph becoming west in the afternoon. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
A slight chance of showers, then a chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 49. Light and variable wind becoming southeast 5 to 10 mph in the evening. Winds could gust as high as 16 mph. Chance of precipitation is 50%.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 76. Breezy, with a south wind 13 to 23 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.
Friday Night
A chance of showers and thunderstorms before midnight, then showers and possibly a thunderstorm between midnight and 3am, then showers after 3am. Low around 54. Breezy, with a south wind 17 to 21 mph, with gusts as high as 29 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 63. Southwest wind 13 to 18 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph.
Saturday Night
Partly cloudy, with a low around 37. West northwest wind 6 to 10 mph, with gusts as high as 16 mph.
Sunday
Sunny, with a high near 62.
Sunday Night
Mostly clear, with a low around 44.
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 73. Breezy.
Tuesday Night
Rain. Mostly cloudy, with a low around 43. Breezy.
Wednesday
Rain likely. Mostly cloudy, with a high near 53. Breezy.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles N Forsyth IL
 39.97°N 88.96°W (Elev. 679 ft)
Last Update:
6:36 pm CST Mar 4, 2026
Forecast Valid:
7pm 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