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

31°F

-1°C

Humidity 89%
Wind Speed Calm
Barometer 30.07 in (1018.3 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 17 Nov 3:53 am CST
Extended Forecast for

3 Miles SSE Mascoutah IL

  • Today

    Today: Sunny, with a high near 59. Light east wind becoming southeast 6 to 11 mph in the morning.

    High: 59 °F

    Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 49. Southeast wind around 10 mph. Chance of precipitation is 70%.

    Low: 49 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Partly sunny, with a high near 73. Southeast wind 7 to 10 mph becoming north in the afternoon. Chance of precipitation is 50%.

    High: 73 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 46. North wind around 6 mph becoming calm in the evening.

    Low: 46 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 61. Light north wind.

    High: 61 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday

    Thursday: Rain and possibly a thunderstorm. High near 66. Chance of precipitation is 90%.

    High: 66 °F

    Rain

  • Thursday Night

    Thursday Night: Rain. Low around 56. Chance of precipitation is 80%.

    Low: 56 °F

    Rain

  • Friday

    Friday: Rain likely, mainly before noon. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.

    High: 66 °F

    Rain Likely

Detailed Forecast

Today
Sunny, with a high near 59. Light east wind becoming southeast 6 to 11 mph in the morning.
Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 49. Southeast wind around 10 mph. Chance of precipitation is 70%.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 73. Southeast wind 7 to 10 mph becoming north in the afternoon. Chance of precipitation is 50%.
Tuesday Night
Mostly cloudy, with a low around 46. North wind around 6 mph becoming calm in the evening.
Wednesday
Mostly cloudy, with a high near 61. Light north wind.
Wednesday Night
A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 48.
Thursday
Rain and possibly a thunderstorm. High near 66. Chance of precipitation is 90%.
Thursday Night
Rain. Low around 56. Chance of precipitation is 80%.
Friday
Rain likely, mainly before noon. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.
Friday Night
A 30 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 44.
Saturday
Partly sunny, with a high near 56.
Saturday Night
Partly cloudy, with a low around 40.
Sunday
A 20 percent chance of rain. Mostly sunny, with a high near 59.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE Mascoutah IL
 38.47°N 89.78°W (Elev. 420 ft)
Last Update:
3:16 am CST Nov 17, 2025
Forecast Valid:
4am CST Nov 17, 2025-6pm CST Nov 23, 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