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.

Overcast and Breezy

61°F

16°C

Humidity 78%
Wind Speed NW 23 G 33 mph
Barometer 30.04 in (1016.9 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 15 Oct 11:53 pm CDT
Extended Forecast for

Swansea IL

  • Overnight

    Overnight: Isolated showers before 1am. Increasing clouds, with a low around 50. Northwest wind 14 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.

    Low: 50 °F

    Isolated
    Showers

  • Friday

    Friday: Isolated showers after 3pm. Mostly cloudy, with a high near 56. Breezy, with a northwest wind 17 to 20 mph, with gusts as high as 32 mph. Chance of precipitation is 20%.

    High: 56 °F

    Breezy.
    Partly Sunny
    then Isolated
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 39. North wind 9 to 17 mph, with gusts as high as 28 mph.

    Low: 39 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 60. Northeast wind 3 to 7 mph.

    High: 60 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 36. Calm wind.

    Low: 36 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

Detailed Forecast

Overnight
Isolated showers before 1am. Increasing clouds, with a low around 50. Northwest wind 14 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.
Friday
Isolated showers after 3pm. Mostly cloudy, with a high near 56. Breezy, with a northwest wind 17 to 20 mph, with gusts as high as 32 mph. Chance of precipitation is 20%.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 39. North wind 9 to 17 mph, with gusts as high as 28 mph.
Saturday
Sunny, with a high near 60. Northeast wind 3 to 7 mph.
Saturday Night
Clear, with a low around 36. Calm wind.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 40.
Monday
Mostly sunny, with a high near 71.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 48.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 50.
Thursday
Sunny, with a high near 81.
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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:
10:26 pm CDT Oct 15, 2026
Forecast Valid:
12am CDT Oct 16, 2026-6pm CDT Oct 22, 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