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

46°F

8°C

Humidity 56%
Wind Speed NW 15 mph
Barometer 30.29 in (1025.8 mb)
Dewpoint 31°F (-1°C)
Visibility 9.00 mi
Wind Chill40°F (4°C)
Last update 5 Apr 8:53 am CDT
Extended Forecast for

Swansea IL

  • Today

    Today: Sunny, with a high near 58. Northwest wind 11 to 13 mph, with gusts as high as 22 mph.

    High: 58 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 41. Northwest wind 5 to 8 mph becoming light and variable.

    Low: 41 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 62. Northwest wind 6 to 10 mph.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 38. North wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 38 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 53. Northeast wind around 8 mph becoming east in the afternoon.

    High: 53 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 58. Northwest wind 11 to 13 mph, with gusts as high as 22 mph.
Tonight
Clear, with a low around 41. Northwest wind 5 to 8 mph becoming light and variable.
Monday
Sunny, with a high near 62. Northwest wind 6 to 10 mph.
Monday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 38. North wind 8 to 10 mph, with gusts as high as 20 mph.
Tuesday
Mostly cloudy, with a high near 53. Northeast wind around 8 mph becoming east in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 40.
Wednesday
Mostly sunny, with a high near 72.
Wednesday Night
Partly cloudy, with a low around 53.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 74.
Thursday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 56. Chance of precipitation is 20%.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 76.
Friday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 57.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Swansea IL
 38.55°N 90.01°W (Elev. 548 ft)
Last Update:
9:51 am CDT Apr 5, 2026
Forecast Valid:
9am CDT Apr 5, 2026-6pm CDT Apr 11, 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