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

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

50°F

10°C

Humidity 39%
Wind Speed S 5 mph
Barometer 30.15 in (1021.2 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 12 Jan 5:53 pm CST
Extended Forecast for

Valmeyer IL

  • Tonight

    Tonight: Mostly cloudy during the early evening, then clearing, with a low around 40. South wind 5 to 7 mph.

    Low: 40 °F

    Clearing

  • Tuesday

    Tuesday: Increasing clouds, with a high near 64. West wind 7 to 13 mph, with gusts as high as 28 mph.

    High: 64 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain, mainly between 7pm and 11pm. Mostly cloudy, with a low around 38. West wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 38 °F

    Chance Rain

  • Wednesday

    Wednesday: Partly sunny, with a temperature rising to near 43 by 11am, then falling to around 35 during the remainder of the day. Northwest wind 13 to 18 mph, with gusts as high as 31 mph.

    High: 43 °F⇓

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 18. North wind 7 to 14 mph, with gusts as high as 25 mph.

    Low: 18 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 44.

    High: 44 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 21.

    Low: 21 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy during the early evening, then clearing, with a low around 40. South wind 5 to 7 mph.
Tuesday
Increasing clouds, with a high near 64. West wind 7 to 13 mph, with gusts as high as 28 mph.
Tuesday Night
A 30 percent chance of rain, mainly between 7pm and 11pm. Mostly cloudy, with a low around 38. West wind 7 to 11 mph, with gusts as high as 21 mph.
Wednesday
Partly sunny, with a temperature rising to near 43 by 11am, then falling to around 35 during the remainder of the day. Northwest wind 13 to 18 mph, with gusts as high as 31 mph.
Wednesday Night
Mostly clear, with a low around 18. North wind 7 to 14 mph, with gusts as high as 25 mph.
Thursday
Mostly sunny, with a high near 33.
Thursday Night
Mostly cloudy, with a low around 25.
Friday
Partly sunny, with a high near 44.
Friday Night
Mostly cloudy, with a low around 21.
Saturday
Partly sunny, with a high near 31.
Saturday Night
Partly cloudy, with a low around 11.
Sunday
Sunny, with a high near 29.
Sunday Night
Mostly clear, with a low around 14.
M.L.King Day
Mostly sunny, with a high near 37.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Valmeyer IL
 38.29°N 90.3°W (Elev. 515 ft)
Last Update:
4:46 pm CST Jan 12, 2026
Forecast Valid:
6pm CST Jan 12, 2026-6pm CST Jan 19, 2026
 
Forecast Discussion
 
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Additional Resources

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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