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.

Mostly Cloudy

86°F

30°C

Humidity 59%
Wind Speed W 5 mph
Barometer 29.96 in (1014.2 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 25 Jun 12:53 pm CDT
Extended Forecast for

Mascoutah IL

Flood Watch June 25, 01:41pm until June 26, 07:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch June 25, 01:41pm until June 26, 07:00am

    NOW until 7:00am Fri

    Flood Watch

  • This Afternoon

    High: 88 °F

    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms, mainly after midnight. Low around 69. Light and variable wind. Chance of precipitation is 90%.

    Low: 69 °F

    Chance
    T-storms then
    T-storms

  • Friday

    Friday: Showers and thunderstorms, mainly before 5pm. High near 82. South wind 6 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    High: 82 °F

    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely, mainly before midnight. Mostly cloudy, with a low around 69. Southwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 69 °F

    T-storms
    Likely then
    Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. Calm wind. Chance of precipitation is 40%.

    High: 85 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

This Afternoon
A 40 percent chance of showers and thunderstorms, mainly after 2pm. Partly sunny, with a high near 88. West wind 5 to 9 mph becoming calm.
Tonight
Showers and thunderstorms, mainly after midnight. Low around 69. Light and variable wind. Chance of precipitation is 90%.
Friday
Showers and thunderstorms, mainly before 5pm. High near 82. South wind 6 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Friday Night
Showers and thunderstorms likely, mainly before midnight. Mostly cloudy, with a low around 69. Southwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 60%.
Saturday
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. Calm wind. Chance of precipitation is 40%.
Saturday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Sunday
Sunny, with a high near 93.
Sunday Night
Mostly clear, with a low around 75.
Monday
Sunny, with a high near 95.
Monday Night
Clear, with a low around 76.
Tuesday
Sunny, with a high near 96.
Tuesday Night
Clear, with a low around 76.
Wednesday
Sunny, with a high near 96.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mascoutah IL
 38.5°N 89.81°W (Elev. 427 ft)
Last Update:
1:36 pm CDT Jun 25, 2026
Forecast Valid:
1pm CDT Jun 25, 2026-6pm CDT Jul 1, 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