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

75°F

24°C

Humidity 62%
Wind Speed S 9 mph
Barometer 29.95 in (1013.8 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 3 Apr 9:53 pm CDT
Extended Forecast for

4 Miles WSW Mascoutah IL

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 4am. Low around 56. South wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.

    Low: 56 °F

    Chance
    T-storms then
    T-storms

  • Saturday

    Saturday: Showers and possibly a thunderstorm before noon, then a slight chance of showers between noon and 2pm. Temperature falling to around 56 by 1pm. Southwest wind 10 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%.

    High: 63 °F⇓

    Showers then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming clear, with a low around 39. Northwest wind 7 to 14 mph, with gusts as high as 22 mph.

    Low: 39 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 59. Northwest wind 7 to 11 mph.

    High: 59 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 39. Northwest wind around 6 mph becoming calm in the evening.

    Low: 39 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 55.

    High: 55 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

Detailed Forecast

Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 4am. Low around 56. South wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Saturday
Showers and possibly a thunderstorm before noon, then a slight chance of showers between noon and 2pm. Temperature falling to around 56 by 1pm. Southwest wind 10 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%.
Saturday Night
Mostly cloudy, then gradually becoming clear, with a low around 39. Northwest wind 7 to 14 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 59. Northwest wind 7 to 11 mph.
Sunday Night
Clear, with a low around 39. Northwest wind around 6 mph becoming calm in the evening.
Monday
Sunny, with a high near 62.
Monday Night
Mostly cloudy, with a low around 37.
Tuesday
Mostly cloudy, with a high near 55.
Tuesday Night
Partly cloudy, with a low around 39.
Wednesday
Mostly sunny, with a high near 71.
Wednesday Night
Mostly clear, with a low around 53.
Thursday
A 20 percent chance of showers. Mostly sunny, with a high near 74.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 54.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 76.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WSW Mascoutah IL
 38.5°N 89.87°W (Elev. 449 ft)
Last Update:
8:06 pm CDT Apr 3, 2026
Forecast Valid:
10pm CDT Apr 3, 2026-6pm CDT Apr 10, 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