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.

Fair

79°F

26°C

Humidity 60%
Wind Speed W 9 mph
Barometer 30.08 in (1018.3 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 24 Jun 10:53 am CDT
Extended Forecast for

3 Miles WSW Mascoutah IL

  • Today

    Today: Partly sunny, with a high near 83. Southwest wind around 6 mph.

    High: 83 °F

    Partly Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms before 1am, then a slight chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 67. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 2pm. Partly sunny, with a high near 86. Light and variable wind.

    High: 86 °F

    Partly Sunny
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 68. Calm wind becoming south around 5 mph after midnight. Chance of precipitation is 90%.

    Low: 68 °F

    T-storms

  • Friday

    Friday: Showers and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. High near 83. Southwest wind 5 to 7 mph. Chance of precipitation is 80%.

    High: 83 °F

    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely. Mostly cloudy, with a low around 69. Chance of precipitation is 70%.

    Low: 69 °F

    T-storms
    Likely

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 87. Chance of precipitation is 60%.

    High: 87 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 93.

    High: 93 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 83. Southwest wind around 6 mph.
Tonight
A chance of showers and thunderstorms before 1am, then a slight chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 67. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Thursday
A 50 percent chance of showers and thunderstorms, mainly after 2pm. Partly sunny, with a high near 86. Light and variable wind.
Thursday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 68. Calm wind becoming south around 5 mph after midnight. Chance of precipitation is 90%.
Friday
Showers and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. High near 83. Southwest wind 5 to 7 mph. Chance of precipitation is 80%.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 69. Chance of precipitation is 70%.
Saturday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 87. Chance of precipitation is 60%.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 72.
Sunday
Mostly 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 95.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Mascoutah IL
 38.48°N 89.84°W (Elev. 400 ft)
Last Update:
8:31 am CDT Jun 24, 2026
Forecast Valid:
11am CDT Jun 24, 2026-6pm CDT Jun 30, 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