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.

Fog/Mist

71°F

22°C

Humidity 96%
Wind Speed E 5 mph
Barometer 30.00 in (1015.6 mb)
Dewpoint 70°F (21°C)
Visibility 3.00 mi
Last update 15 Oct 9:53 am CDT
Extended Forecast for

2 Miles SSE Mascoutah IL

  • Today

    Today: Showers likely and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 83. Southwest wind 5 to 11 mph. Chance of precipitation is 60%.

    High: 83 °F

    Showers
    Likely then
    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely before 1am, then scattered showers between 1am and 4am. Increasing clouds, with a low around 48. Southwest wind 9 to 17 mph becoming northwest after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 60%.

    Low: 48 °F

    Showers
    Likely

  • Friday

    Friday: Mostly cloudy through mid morning, then becoming sunny, with a high near 57. Breezy, with a northwest wind 17 to 22 mph.

    High: 57 °F

    Sunny and
    Breezy

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 39. North wind 11 to 16 mph, with gusts as high as 24 mph.

    Low: 39 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 60. North wind 3 to 8 mph.

    High: 60 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 36.

    Low: 36 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

Detailed Forecast

Today
Showers likely and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 83. Southwest wind 5 to 11 mph. Chance of precipitation is 60%.
Tonight
Showers and thunderstorms likely before 1am, then scattered showers between 1am and 4am. Increasing clouds, with a low around 48. Southwest wind 9 to 17 mph becoming northwest after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 60%.
Friday
Mostly cloudy through mid morning, then becoming sunny, with a high near 57. Breezy, with a northwest wind 17 to 22 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 39. North wind 11 to 16 mph, with gusts as high as 24 mph.
Saturday
Sunny, with a high near 60. North wind 3 to 8 mph.
Saturday Night
Clear, with a low around 36.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 38.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 44.
Wednesday
Sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSE Mascoutah IL
 38.47°N 89.78°W (Elev. 420 ft)
Last Update:
9:16 am CDT Oct 15, 2026
Forecast Valid:
10am CDT Oct 15, 2026-6pm CDT Oct 21, 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