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Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

73°F

23°C

Humidity 74%
Wind Speed Calm
Barometer 29.93 in (1013.2 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 20 Jun 9:53 pm CDT
Extended Forecast for

3 Miles SSE Mascoutah IL

Flood Watch June 21, 07:00am until June 22, 07:00am
Click here for hazard details and duration
Flood Watch

  • Tonight

    Tonight: Partly cloudy, with a low around 66. East wind 3 to 5 mph.

    Low: 66 °F

    Partly Cloudy

  • Sunday

    Sunday: Showers and thunderstorms likely, mainly after 5pm. Mostly cloudy, with a high near 87. Southeast wind 7 to 17 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 60%.

    High: 87 °F

    Chance
    T-storms then
    T-storms
    Likely

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before midnight. Low around 65. Southwest wind 7 to 13 mph becoming northwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 90%.

    Low: 65 °F

    T-storms then
    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 8am. Mostly cloudy, with a high near 77. Northwest wind 9 to 11 mph.

    High: 77 °F

    Slight Chance
    T-storms then
    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61. North wind 5 to 9 mph becoming calm in the evening.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 66. East wind 3 to 5 mph.
Sunday
Showers and thunderstorms likely, mainly after 5pm. Mostly cloudy, with a high near 87. Southeast wind 7 to 17 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 60%.
Sunday Night
Showers and thunderstorms, mainly before midnight. Low around 65. Southwest wind 7 to 13 mph becoming northwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 90%.
Monday
A 20 percent chance of showers and thunderstorms before 8am. Mostly cloudy, with a high near 77. Northwest wind 9 to 11 mph.
Monday Night
Partly cloudy, with a low around 61. North wind 5 to 9 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 81.
Tuesday Night
Mostly clear, with a low around 63.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 63.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 63.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE Mascoutah IL
 38.47°N 89.78°W (Elev. 420 ft)
Last Update:
10:41 pm CDT Jun 20, 2026
Forecast Valid:
10pm CDT Jun 20, 2026-6pm CDT Jun 27, 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