National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

92°F

33°C

Humidity 47%
Wind Speed S 13 G 21 mph
Barometer 29.91 in (1012.3 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index97°F (36°C)
Last update 20 Jun 5:53 pm CDT
Extended Forecast for

Mascoutah IL

Extreme Heat Warning June 21, 12:00pm until June 24, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning

  • Tonight

    Tonight: Clear, with a low around 75. South wind 8 to 13 mph, with gusts as high as 21 mph.

    Low: 75 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 96. Heat index values as high as 109. Southwest wind 9 to 16 mph, with gusts as high as 24 mph.

    High: 96 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 74. South wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 74 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 96. Heat index values as high as 106. Southwest wind 6 to 10 mph.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 76. South wind 5 to 9 mph.

    Low: 76 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms before 1pm. Sunny, with a high near 93.

    High: 93 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 76.

    Low: 76 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 75. South wind 8 to 13 mph, with gusts as high as 21 mph.
Saturday
Sunny, with a high near 96. Heat index values as high as 109. Southwest wind 9 to 16 mph, with gusts as high as 24 mph.
Saturday Night
Clear, with a low around 74. South wind 7 to 11 mph, with gusts as high as 21 mph.
Sunday
Sunny, with a high near 96. Heat index values as high as 106. Southwest wind 6 to 10 mph.
Sunday Night
Mostly clear, with a low around 76. South wind 5 to 9 mph.
Monday
Sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 76.
Tuesday
A 20 percent chance of showers and thunderstorms before 1pm. Sunny, with a high near 93.
Tuesday Night
Partly cloudy, with a low around 76.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94.
Wednesday Night
Partly cloudy, with a low around 76.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
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:
2:21 pm CDT Jun 20, 2025
Forecast Valid:
6pm CDT Jun 20, 2025-6pm CDT Jun 27, 2025
 
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