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

40°F

4°C

Humidity 68%
Wind Speed S 3 mph
Barometer 30.08 in (1018.4 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 13 Mar 11:53 pm CDT
Extended Forecast for

2 Miles WSW Valmeyer IL

  • Overnight

    Overnight: Partly cloudy, with a low around 35. Calm wind.

    Low: 35 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 66. Light and variable wind becoming southeast 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 66 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 53. South wind 6 to 11 mph, with gusts as high as 24 mph.

    Low: 53 °F

    Partly Cloudy

  • Sunday

    Sunday: Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 69. South wind 15 to 18 mph, with gusts as high as 36 mph. Chance of precipitation is 80%.

    High: 69 °F

    Slight Chance
    Rain then
    Showers

  • Sunday Night

    Sunday Night: Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 21. West wind 16 to 18 mph, with gusts as high as 38 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    Low: 21 °F

    Rain/Snow

  • Monday

    Monday: A 20 percent chance of snow before 1pm. Partly sunny, with a high near 30.

    High: 30 °F

    Slight Chance
    Snow

  • Monday Night

    Monday Night: Mostly clear, with a low around 12.

    Low: 12 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 40.

    High: 40 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of snow before 1am, then a slight chance of rain and snow. Mostly cloudy, with a low around 29. Chance of precipitation is 20%.

    Low: 29 °F

    Slight Chance
    Snow then
    Slight Chance
    Rain/Snow

Detailed Forecast

Overnight
Partly cloudy, with a low around 35. Calm wind.
Saturday
Mostly sunny, with a high near 66. Light and variable wind becoming southeast 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 53. South wind 6 to 11 mph, with gusts as high as 24 mph.
Sunday
Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 69. South wind 15 to 18 mph, with gusts as high as 36 mph. Chance of precipitation is 80%.
Sunday Night
Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 21. West wind 16 to 18 mph, with gusts as high as 38 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Monday
A 20 percent chance of snow before 1pm. Partly sunny, with a high near 30.
Monday Night
Mostly clear, with a low around 12.
Tuesday
Sunny, with a high near 40.
Tuesday Night
A slight chance of snow before 1am, then a slight chance of rain and snow. Mostly cloudy, with a low around 29. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 66.
Wednesday Night
Mostly clear, with a low around 41.
Thursday
Mostly sunny, with a high near 72.
Thursday Night
Mostly clear, with a low around 45.
Friday
Sunny, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW Valmeyer IL
 38.29°N 90.36°W (Elev. 397 ft)
Last Update:
11:46 pm CDT Mar 13, 2026
Forecast Valid:
12am CDT Mar 14, 2026-6pm CDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation