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.

Fog/Mist

38°F

3°C

Humidity 100%
Wind Speed Vrbl 3 mph
Barometer 30.29 in (1026.0 mb)
Dewpoint 38°F (3°C)
Visibility 1.75 mi
Last update 2 Nov 8:53 am CST
Extended Forecast for

Mascoutah IL

Dense Fog Advisory November 2, 09:15am until November 2, 10:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory November 2, 09:15am until November 2, 10:00am

    NOW until 10:00am Sun

    Dense Fog Advisory

  • Today

    High: 55 °F

    Sunny

  • Tonight

    Tonight: Areas of frost after 1am. Otherwise, clear, with a low around 35. Calm wind becoming south around 5 mph after midnight.

    Low: 35 °F

    Clear then
    Areas Frost

  • Monday

    Monday: Patchy frost before 7am. Otherwise, sunny, with a high near 64. West wind 5 to 8 mph becoming light and variable in the afternoon.

    High: 64 °F

    Patchy Frost
    then Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 39. Calm wind.

    Low: 39 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 69. Light southeast wind becoming south 10 to 15 mph in the morning. Winds could gust as high as 22 mph.

    High: 69 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 55. Light and variable wind.
Tonight
Areas of frost after 1am. Otherwise, clear, with a low around 35. Calm wind becoming south around 5 mph after midnight.
Monday
Patchy frost before 7am. Otherwise, sunny, with a high near 64. West wind 5 to 8 mph becoming light and variable in the afternoon.
Monday Night
Partly cloudy, with a low around 39. Calm wind.
Tuesday
Mostly sunny, with a high near 69. Light southeast wind becoming south 10 to 15 mph in the morning. Winds could gust as high as 22 mph.
Tuesday Night
Mostly clear, with a low around 50.
Wednesday
Sunny, with a high near 72.
Wednesday Night
Mostly clear, with a low around 40.
Thursday
Sunny, with a high near 68.
Thursday Night
A 30 percent chance of rain after midnight. Partly cloudy, with a low around 54.
Friday
A 20 percent chance of rain and thunderstorms. Mostly sunny, with a high near 69.
Friday Night
Partly cloudy, with a low around 46.
Saturday
A 20 percent chance of rain. Mostly sunny, with a high near 67.
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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:
8:22 am CST Nov 2, 2025
Forecast Valid:
9am CST Nov 2, 2025-6pm CST Nov 8, 2025
 
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