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

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

41°F

5°C

Humidity 96%
Wind Speed Calm
Barometer 30.03 in (1017.0 mb)
Dewpoint 40°F (4°C)
Visibility 7.00 mi
Last update 15 Feb 8:53 pm CST
Extended Forecast for

Valmeyer IL

Dense Fog Advisory February 15, 11:00pm until February 16, 09:00am
Click here for hazard details and duration
Dense Fog Advisory

  • Tonight

    Tonight: Patchy dense fog after midnight. Otherwise, partly cloudy, with a low around 35. Calm wind.

    Low: 35 °F

    Mostly Clear
    then Patchy
    Dense Fog

  • Washington's Birthday

    Washington's Birthday: Patchy dense fog before 8am. Otherwise, mostly sunny, with a high near 67. Calm wind becoming south 5 to 9 mph in the morning.

    High: 67 °F

    Patchy Dense
    Fog then
    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 44. South wind 5 to 7 mph.

    Low: 44 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 67. South wind 6 to 15 mph, with gusts as high as 26 mph.

    High: 67 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 58. South wind 15 to 18 mph, with gusts as high as 31 mph.

    Low: 58 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 75.

    High: 75 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 40.

    Low: 40 °F

    Slight Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Tonight
Patchy dense fog after midnight. Otherwise, partly cloudy, with a low around 35. Calm wind.
Washington's Birthday
Patchy dense fog before 8am. Otherwise, mostly sunny, with a high near 67. Calm wind becoming south 5 to 9 mph in the morning.
Monday Night
Partly cloudy, with a low around 44. South wind 5 to 7 mph.
Tuesday
Mostly cloudy, with a high near 67. South wind 6 to 15 mph, with gusts as high as 26 mph.
Tuesday Night
Mostly cloudy, with a low around 58. South wind 15 to 18 mph, with gusts as high as 31 mph.
Wednesday
Sunny, with a high near 74.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 75.
Thursday Night
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 40.
Friday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 54.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 32.
Saturday
A 20 percent chance of rain. Mostly sunny, with a high near 51.
Saturday Night
A 20 percent chance of rain. Partly cloudy, with a low around 29.
Sunday
Sunny, with a high near 48.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Valmeyer IL
 38.31°N 90.3°W (Elev. 397 ft)
Last Update:
7:41 pm CST Feb 15, 2026
Forecast Valid:
9pm CST Feb 15, 2026-6pm CST Feb 22, 2026
 
Forecast Discussion
 
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Additional Resources

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