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

45°F

7°C

Humidity 97%
Wind Speed Calm
Barometer 30.16 in (1021.2 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 11 May 2:53 am CDT
Extended Forecast for

Swansea IL

  • Overnight

    Overnight: Clear, with a low around 46. Calm wind.

    Low: 46 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 75. Calm wind becoming northwest 5 to 8 mph in the afternoon.

    High: 75 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 52. Light and variable wind.

    Low: 52 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 81. South wind 5 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph.

    High: 81 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 1am. Partly cloudy, with a low around 59. Southwest wind around 8 mph becoming northwest after midnight. Chance of precipitation is 60%.

    Low: 59 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 49.

    Low: 49 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 46. Calm wind.
Monday
Sunny, with a high near 75. Calm wind becoming northwest 5 to 8 mph in the afternoon.
Monday Night
Mostly clear, with a low around 52. Light and variable wind.
Tuesday
Sunny, with a high near 81. South wind 5 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph.
Tuesday Night
Showers likely and possibly a thunderstorm before 1am. Partly cloudy, with a low around 59. Southwest wind around 8 mph becoming northwest after midnight. Chance of precipitation is 60%.
Wednesday
Sunny, with a high near 76.
Wednesday Night
Clear, with a low around 49.
Thursday
Sunny, with a high near 74.
Thursday Night
Mostly clear, with a low around 55.
Friday
A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 82.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Swansea IL
 38.55°N 89.98°W (Elev. 551 ft)
Last Update:
2:21 am CDT May 11, 2026
Forecast Valid:
3am CDT May 11, 2026-6pm CDT May 17, 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