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

38°F

3°C

Humidity 68%
Wind Speed Calm
Barometer 29.76 in (1007.9 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 25 Feb 7:53 am CST
Extended Forecast for

3 Miles E Mascoutah IL

  • Today

    Today: Mostly cloudy, with a high near 52. Light and variable wind.

    High: 52 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 40 percent chance of rain, mainly after 11pm. Mostly cloudy, with a low around 34. East wind 3 to 6 mph.

    Low: 34 °F

    Chance Rain

  • Thursday

    Thursday: A 20 percent chance of rain before 7am. Mostly sunny, with a high near 52. Northeast wind around 6 mph becoming calm.

    High: 52 °F

    Slight Chance
    Rain then
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 33. Light south wind.

    Low: 33 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 67. Light south wind becoming southwest 6 to 11 mph in the morning.

    High: 67 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain after midnight. Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy
    then Slight
    Chance Rain

  • Sunday

    Sunday: A chance of rain before noon, then a chance of rain and snow. Mostly cloudy, with a high near 47. Chance of precipitation is 40%.

    High: 47 °F

    Chance Rain
    then Chance
    Rain/Snow

Detailed Forecast

Today
Mostly cloudy, with a high near 52. Light and variable wind.
Tonight
A 40 percent chance of rain, mainly after 11pm. Mostly cloudy, with a low around 34. East wind 3 to 6 mph.
Thursday
A 20 percent chance of rain before 7am. Mostly sunny, with a high near 52. Northeast wind around 6 mph becoming calm.
Thursday Night
Mostly clear, with a low around 33. Light south wind.
Friday
Sunny, with a high near 67. Light south wind becoming southwest 6 to 11 mph in the morning.
Friday Night
Mostly clear, with a low around 41.
Saturday
Mostly sunny, with a high near 63.
Saturday Night
A 20 percent chance of rain after midnight. Partly cloudy, with a low around 33.
Sunday
A chance of rain before noon, then a chance of rain and snow. Mostly cloudy, with a high near 47. Chance of precipitation is 40%.
Sunday Night
Rain likely before midnight, then a chance of rain and snow. Cloudy, with a low around 32. Chance of precipitation is 60%.
Monday
A 40 percent chance of rain. Mostly cloudy, with a high near 42.
Monday Night
A 40 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 30.
Tuesday
A 50 percent chance of rain. Mostly cloudy, with a high near 47.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Mascoutah IL
 38.52°N 89.75°W (Elev. 466 ft)
Last Update:
5:26 am CST Feb 25, 2026
Forecast Valid:
8am CST Feb 25, 2026-6pm CST Mar 3, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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