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

59°F

15°C

Humidity 62%
Wind Speed SW 6 mph
Barometer 30.03 in (1016.9 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 5 Nov 7:53 am CST
Extended Forecast for

Mascoutah IL

  • Today

    Today: Sunny, with a high near 71. Southwest wind 9 to 15 mph becoming north in the afternoon. Winds could gust as high as 23 mph.

    High: 71 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 36. North wind around 6 mph becoming light and variable after midnight.

    Low: 36 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 65. Light east wind becoming southeast 8 to 13 mph in the morning. Winds could gust as high as 20 mph.

    High: 65 °F

    Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 52. Southeast wind 8 to 11 mph becoming southwest after midnight. Winds could gust as high as 20 mph.

    Low: 52 °F

    Mostly Cloudy
    then Chance
    Rain

  • Friday

    Friday: A 30 percent chance of rain before noon. Mostly sunny, with a high near 73. Southwest wind 8 to 11 mph becoming west in the afternoon.

    High: 73 °F

    Chance Rain
    then Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain before midnight. Partly cloudy, with a low around 37.

    Low: 37 °F

    Slight Chance
    Rain then
    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 45.

    High: 45 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 71. Southwest wind 9 to 15 mph becoming north in the afternoon. Winds could gust as high as 23 mph.
Tonight
Clear, with a low around 36. North wind around 6 mph becoming light and variable after midnight.
Thursday
Sunny, with a high near 65. Light east wind becoming southeast 8 to 13 mph in the morning. Winds could gust as high as 20 mph.
Thursday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 52. Southeast wind 8 to 11 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
Friday
A 30 percent chance of rain before noon. Mostly sunny, with a high near 73. Southwest wind 8 to 11 mph becoming west in the afternoon.
Friday Night
Partly cloudy, with a low around 43.
Saturday
Mostly sunny, with a high near 66.
Saturday Night
A 20 percent chance of rain before midnight. Partly cloudy, with a low around 37.
Sunday
Mostly sunny, with a high near 45.
Sunday Night
Mostly clear, with a low around 24.
Monday
Sunny, with a high near 44.
Monday Night
Mostly clear, with a low around 27.
Veterans Day
Mostly sunny, with a high near 55.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mascoutah IL
 38.52°N 89.81°W (Elev. 423 ft)
Last Update:
6:31 am CST Nov 5, 2025
Forecast Valid:
8am CST Nov 5, 2025-6pm CST Nov 11, 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