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

25°F

-4°C

Humidity 55%
Wind Speed N 6 mph
Barometer 30.32 in (1027.4 mb)
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Wind Chill18°F (-8°C)
Last update 4 Dec 1:53 pm CST
Extended Forecast for

3 Miles WSW Mascoutah IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 25. North wind 5 to 7 mph.

    High: 25 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 10. Light and variable wind.

    Low: 10 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 38. Calm wind becoming south 5 to 7 mph in the morning.

    High: 38 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 27. South wind 5 to 7 mph becoming calm after midnight.

    Low: 27 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly sunny, with a high near 38. Light and variable wind.

    High: 38 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Sunday

    Sunday: A 20 percent chance of rain before noon. Mostly cloudy, with a high near 38.

    High: 38 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 17.

    Low: 17 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 25. North wind 5 to 7 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 10. Light and variable wind.
Friday
Sunny, with a high near 38. Calm wind becoming south 5 to 7 mph in the morning.
Friday Night
Increasing clouds, with a low around 27. South wind 5 to 7 mph becoming calm after midnight.
Saturday
Mostly sunny, with a high near 38. Light and variable wind.
Saturday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 28.
Sunday
A 20 percent chance of rain before noon. Mostly cloudy, with a high near 38.
Sunday Night
Mostly cloudy, with a low around 17.
Monday
Mostly sunny, with a high near 33.
Monday Night
Mostly cloudy, with a low around 23.
Tuesday
Mostly sunny, with a high near 45.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
A 30 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 WSW Mascoutah IL
 38.48°N 89.84°W (Elev. 400 ft)
Last Update:
1:26 pm CST Dec 4, 2025
Forecast Valid:
2pm CST Dec 4, 2025-6pm CST Dec 10, 2025
 
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