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

51°F

11°C

Humidity 98%
Wind Speed NE 3 mph
Barometer 29.59 in
Dewpoint 51°F (11°C)
Visibility 0.50 mi
Last update 19 Feb 6:15 am CST
Extended Forecast for

4 Miles NNE Troy IL

Dense Fog Advisory until February 19, 09:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory until February 19, 09:00am

    NOW until 9:00am Thu

    Dense Fog Advisory

  • Today

    High: 66 °F

    T-storms
    Likely and
    Dense Fog

  • Tonight

    Tonight: Partly cloudy, with a low around 36. Breezy, with a west wind 10 to 15 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 33 mph.

    Low: 36 °F

    Partly Cloudy
    then Partly
    Cloudy and
    Breezy

  • Friday

    Friday: Sunny, with a high near 48. Breezy, with a west wind 15 to 20 mph decreasing to 7 to 12 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 48 °F

    Mostly Sunny
    and Breezy
    then Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 30. North wind 3 to 6 mph.

    Low: 30 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of snow between noon and 3pm, then a slight chance of rain after 3pm. Mostly sunny, with a high near 45. Northwest wind 6 to 11 mph. Chance of precipitation is 20%.

    High: 45 °F

    Mostly Sunny
    then Slight
    Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 25.

    Low: 25 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 37. Breezy.

    High: 37 °F

    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 19.

    Low: 19 °F

    Mostly Clear

Detailed Forecast

Today
Rain and thunderstorms likely before 4pm, then a slight chance of showers and thunderstorms between 4pm and 5pm. Widespread dense fog before 8am. Otherwise, mostly cloudy, with a high near 66. South wind 5 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.
Tonight
Partly cloudy, with a low around 36. Breezy, with a west wind 10 to 15 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 33 mph.
Friday
Sunny, with a high near 48. Breezy, with a west wind 15 to 20 mph decreasing to 7 to 12 mph in the afternoon. Winds could gust as high as 30 mph.
Friday Night
Partly cloudy, with a low around 30. North wind 3 to 6 mph.
Saturday
A slight chance of snow between noon and 3pm, then a slight chance of rain after 3pm. Mostly sunny, with a high near 45. Northwest wind 6 to 11 mph. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 25.
Sunday
Sunny, with a high near 37. Breezy.
Sunday Night
Mostly clear, with a low around 19.
Monday
Sunny, with a high near 36.
Monday Night
Mostly clear, with a low around 19.
Tuesday
Mostly sunny, with a high near 48.
Tuesday Night
Mostly cloudy, with a low around 37.
Wednesday
Mostly cloudy, with a high near 59.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNE Troy IL
 38.79°N 89.88°W (Elev. 551 ft)
Last Update:
4:26 am CST Feb 19, 2026
Forecast Valid:
6am CST Feb 19, 2026-6pm CST Feb 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation