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

72°F

22°C

Humidity 66%
Wind Speed S 15 G 28 mph
Barometer 29.77 in (1007.8 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 9 Mar 2:53 pm CDT
Extended Forecast for

3 Miles WNW Swansea IL

  • Tonight

    Tonight: Partly cloudy, with a low around 62. South wind 8 to 14 mph, with gusts as high as 22 mph.

    Low: 62 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81. South wind 6 to 16 mph, with gusts as high as 26 mph.

    High: 81 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 56. Southwest wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.

    Low: 56 °F

    Chance
    T-storms then
    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before 1pm, then showers likely. Temperature rising to near 65 by 10am, then falling to around 50 during the remainder of the day. Southwest wind 14 to 17 mph becoming northwest in the afternoon. Winds could gust as high as 29 mph. Chance of precipitation is 90%.

    High: 65 °F⇓

    T-storms then
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 34. Northwest wind 7 to 17 mph, with gusts as high as 26 mph.

    Low: 34 °F

    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 54.

    High: 54 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 64.

    High: 64 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 62. South wind 8 to 14 mph, with gusts as high as 22 mph.
Tuesday
Mostly sunny, with a high near 81. South wind 6 to 16 mph, with gusts as high as 26 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 56. Southwest wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
Wednesday
Showers and possibly a thunderstorm before 1pm, then showers likely. Temperature rising to near 65 by 10am, then falling to around 50 during the remainder of the day. Southwest wind 14 to 17 mph becoming northwest in the afternoon. Winds could gust as high as 29 mph. Chance of precipitation is 90%.
Wednesday Night
Mostly cloudy, with a low around 34. Northwest wind 7 to 17 mph, with gusts as high as 26 mph.
Thursday
Sunny, with a high near 54.
Thursday Night
Mostly cloudy, with a low around 44.
Friday
Mostly cloudy, with a high near 64.
Friday Night
Mostly cloudy, with a low around 41.
Saturday
Mostly sunny, with a high near 70.
Saturday Night
Partly cloudy, with a low around 53.
Sunday
A 50 percent chance of rain. Mostly cloudy, with a high near 66.
Sunday Night
A chance of rain and snow. Partly cloudy, with a low around 29. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 42.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Swansea IL
 38.57°N 90.04°W (Elev. 486 ft)
Last Update:
3:11 pm CDT Mar 9, 2026
Forecast Valid:
3pm CDT Mar 9, 2026-6pm CDT Mar 16, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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