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.

Mostly Cloudy

62°F

17°C

Humidity 80%
Wind Speed NE 3 mph
Barometer 30.06 in (1017.6 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 28 Sep 4:53 am CDT
Extended Forecast for

Mascoutah IL

  • Today

    Today: Sunny, with a high near 77. Calm wind becoming northeast around 5 mph.

    High: 77 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 52. Light northeast wind.

    Low: 52 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 82. Calm wind becoming south around 6 mph in the afternoon.

    High: 82 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 60. Southeast wind around 6 mph becoming calm in the evening.

    Low: 60 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly sunny, with a high near 88. Light south wind increasing to 9 to 14 mph in the morning.

    High: 88 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 69.

    Low: 69 °F

    Mostly Cloudy

  • Thursday

    Thursday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 84. Chance of precipitation is 60%.

    High: 84 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Showers
    Likely

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 72.

    High: 72 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 77. Calm wind becoming northeast around 5 mph.
Tonight
Clear, with a low around 52. Light northeast wind.
Tuesday
Sunny, with a high near 82. Calm wind becoming south around 6 mph in the afternoon.
Tuesday Night
Increasing clouds, with a low around 60. Southeast wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 88. Light south wind increasing to 9 to 14 mph in the morning.
Wednesday Night
Mostly cloudy, with a low around 69.
Thursday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 84. Chance of precipitation is 60%.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Friday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 72.
Friday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 59.
Saturday
A 40 percent chance of showers. Mostly sunny, with a high near 72.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 60.
Sunday
A 30 percent chance of showers. Partly sunny, with a high near 73.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mascoutah IL
 38.52°N 89.81°W (Elev. 423 ft)
Last Update:
4:16 am CDT Sep 28, 2026
Forecast Valid:
5am CDT Sep 28, 2026-6pm CDT Oct 4, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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