National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fog

52°F

11°C

Humidity 97%
Wind Speed Calm
Barometer 30.04 in
Dewpoint 51°F (11°C)
Visibility 0.50 mi
Last update 20 Nov 10:15 pm CST
Extended Forecast for

4 Miles N Trenton IL

Dense Fog Advisory until November 21, 09:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until November 21, 09:00am

    NOW until 9:00am Fri

    Dense Fog Advisory

  • Tonight

    Low: 51 °F

    Rain and
    Areas Dense
    Fog

  • Friday

    Friday: Rain. Areas of dense fog before 5pm. High near 58. East wind 5 to 8 mph. Chance of precipitation is 100%.

    High: 58 °F

    Rain and
    Areas Dense
    Fog then Rain
    Likely and
    Patchy Fog

  • Friday Night

    Friday Night: Rain, mainly before midnight. Patchy fog between 7pm and 8pm. Low around 44. North wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    Low: 44 °F

    Rain and
    Patchy Fog
    then Chance
    Rain

  • Saturday

    Saturday: Partly sunny, then gradually becoming sunny, with a high near 58. North wind 3 to 6 mph.

    High: 58 °F

    Becoming
    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 37. Calm wind.

    Low: 37 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy
    then Slight
    Chance Rain

  • Monday

    Monday: Rain likely, mainly after noon. Mostly cloudy, with a high near 59. Chance of precipitation is 60%.

    High: 59 °F

    Chance Rain
    then Rain
    Likely

Detailed Forecast

Tonight
Rain, mainly after 1am. Areas of dense fog. Low around 51. East wind 3 to 5 mph. Chance of precipitation is 100%.
Friday
Rain. Areas of dense fog before 5pm. High near 58. East wind 5 to 8 mph. Chance of precipitation is 100%.
Friday Night
Rain, mainly before midnight. Patchy fog between 7pm and 8pm. Low around 44. North wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Saturday
Partly sunny, then gradually becoming sunny, with a high near 58. North wind 3 to 6 mph.
Saturday Night
Mostly clear, with a low around 37. Calm wind.
Sunday
Sunny, with a high near 61.
Sunday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 42.
Monday
Rain likely, mainly after noon. Mostly cloudy, with a high near 59. Chance of precipitation is 60%.
Monday Night
Rain and possibly a thunderstorm before midnight, then a chance of rain. Low around 49. Chance of precipitation is 80%.
Tuesday
A 20 percent chance of rain. Partly sunny, with a high near 62.
Tuesday Night
Partly cloudy, with a low around 37.
Wednesday
Mostly sunny, with a high near 48.
Wednesday Night
Partly cloudy, with a low around 29.
Thanksgiving Day
Mostly sunny, with a high near 44.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles N Trenton IL
 38.67°N 89.69°W (Elev. 502 ft)
Last Update:
10:11 pm CST Nov 20, 2025
Forecast Valid:
10pm CST Nov 20, 2025-6pm CST Nov 27, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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