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.

Fair

59°F

15°C

Humidity 33%
Wind Speed W 18 G 33 mph
Barometer 29.93 in (1013.4 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 13 Mar 11:53 am CDT
Extended Forecast for

4 Miles SSW Mascoutah IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 62. West wind 13 to 16 mph, with gusts as high as 25 mph.

    High: 62 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 36. Northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 36 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 63. East wind 6 to 13 mph becoming south in the afternoon. Winds could gust as high as 20 mph.

    High: 63 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 55. Southeast wind 9 to 15 mph, with gusts as high as 25 mph.

    Low: 55 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 68. Breezy, with a south wind 20 to 24 mph, with gusts as high as 38 mph. Chance of precipitation is 80%.

    High: 68 °F

    Breezy.
    Chance Rain
    then Showers

  • Sunday Night

    Sunday Night: Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 23. Breezy. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    Low: 23 °F

    Rain/Snow and
    Breezy

  • Monday

    Monday: A 30 percent chance of snow before 1pm. Partly sunny, with a high near 29. Blustery.

    High: 29 °F

    Chance Snow
    and Blustery

  • Monday Night

    Monday Night: Partly cloudy, with a low around 14.

    Low: 14 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 36.

    High: 36 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 62. West wind 13 to 16 mph, with gusts as high as 25 mph.
Tonight
Partly cloudy, with a low around 36. Northwest wind 5 to 7 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 63. East wind 6 to 13 mph becoming south in the afternoon. Winds could gust as high as 20 mph.
Saturday Night
Increasing clouds, with a low around 55. Southeast wind 9 to 15 mph, with gusts as high as 25 mph.
Sunday
Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 68. Breezy, with a south wind 20 to 24 mph, with gusts as high as 38 mph. Chance of precipitation is 80%.
Sunday Night
Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 23. Breezy. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Monday
A 30 percent chance of snow before 1pm. Partly sunny, with a high near 29. Blustery.
Monday Night
Partly cloudy, with a low around 14.
Tuesday
Mostly sunny, with a high near 36.
Tuesday Night
A slight chance of rain and snow after 1am. Mostly cloudy, with a low around 28. Chance of precipitation is 20%.
Wednesday
Mostly cloudy, with a high near 59.
Wednesday Night
Partly cloudy, with a low around 40.
Thursday
Mostly sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Mascoutah IL
 38.45°N 89.84°W (Elev. 433 ft)
Last Update:
11:41 am CDT Mar 13, 2026
Forecast Valid:
12pm CDT Mar 13, 2026-6pm CDT Mar 19, 2026
 
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Additional Resources

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Chance of Precipitation