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

39°F

4°C

Humidity 67%
Wind Speed NE 7 mph
Barometer 30.09 in (1019.0 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 14 Mar 3:53 am CDT
Extended Forecast for

3 Miles SE Mascoutah IL

  • Today

    Today: Mostly sunny, with a high near 63. East wind 6 to 14 mph becoming southeast in the afternoon. Winds could gust as high as 21 mph.

    High: 63 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 54. South wind 10 to 17 mph, with gusts as high as 28 mph.

    Low: 54 °F

    Partly Cloudy

  • Sunday

    Sunday: Rain, with thunderstorms also possible after 4pm. High near 67. Breezy, with a south wind 22 to 28 mph, with gusts as high as 39 mph. Chance of precipitation is 80%.

    High: 67 °F

    Breezy.
    Slight Chance
    Rain then
    Rain

  • Sunday Night

    Sunday Night: Rain before 10pm, then rain and snow between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 22. Breezy, with a southwest wind 21 to 26 mph becoming west in the evening. Winds could gust as high as 40 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    Low: 22 °F

    Rain/Snow and
    Breezy

  • Monday

    Monday: A 20 percent chance of snow before 1pm. Mostly cloudy, with a high near 28. Blustery, with a northwest wind 22 to 26 mph, with gusts as high as 39 mph.

    High: 28 °F

    Slight Chance
    Snow and
    Blustery

  • Monday Night

    Monday Night: Partly cloudy, with a low around 13.

    Low: 13 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 36.

    High: 36 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of rain and snow after 1am. Mostly cloudy, with a low around 30. Chance of precipitation is 20%.

    Low: 30 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Wednesday

    Wednesday: Partly sunny, with a high near 62.

    High: 62 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 63. East wind 6 to 14 mph becoming southeast in the afternoon. Winds could gust as high as 21 mph.
Tonight
Partly cloudy, with a low around 54. South wind 10 to 17 mph, with gusts as high as 28 mph.
Sunday
Rain, with thunderstorms also possible after 4pm. High near 67. Breezy, with a south wind 22 to 28 mph, with gusts as high as 39 mph. Chance of precipitation is 80%.
Sunday Night
Rain before 10pm, then rain and snow between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 22. Breezy, with a southwest wind 21 to 26 mph becoming west in the evening. Winds could gust as high as 40 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Monday
A 20 percent chance of snow before 1pm. Mostly cloudy, with a high near 28. Blustery, with a northwest wind 22 to 26 mph, with gusts as high as 39 mph.
Monday Night
Partly cloudy, with a low around 13.
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 30. Chance of precipitation is 20%.
Wednesday
Partly sunny, with a high near 62.
Wednesday Night
Mostly clear, with a low around 39.
Thursday
Sunny, with a high near 69.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Mascoutah IL
 38.47°N 89.76°W (Elev. 423 ft)
Last Update:
4:41 am CDT Mar 14, 2026
Forecast Valid:
4am CDT Mar 14, 2026-6pm CDT Mar 20, 2026
 
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Additional Resources

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