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

48°F

9°C

Humidity 42%
Wind Speed S 8 G 21 mph
Barometer 29.83 in (1010.0 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 13 Mar 1:53 am CDT
Extended Forecast for

Swansea IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 44. Southwest wind 11 to 17 mph, with gusts as high as 30 mph.

    Low: 44 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 60. West wind 11 to 16 mph, with gusts as high as 26 mph.

    High: 60 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 36. Northwest wind around 6 mph becoming calm.

    Low: 36 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 65. East wind 6 to 11 mph, with gusts as high as 20 mph.

    High: 65 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 55. Southeast wind 10 to 14 mph, with gusts as high as 24 mph.

    Low: 55 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain, with thunderstorms also possible after 4pm. High near 69. Breezy. Chance of precipitation is 80%.

    High: 69 °F

    Breezy.
    Chance Rain
    then Rain

  • Sunday Night

    Sunday Night: Rain before 1am, then a chance of snow. Some thunder is also possible. Low around 23. Blustery. Chance of precipitation is 90%.

    Low: 23 °F

    Rain and
    Breezy then
    Rain/Snow and
    Blustery

  • Monday

    Monday: A 30 percent chance of snow before 1pm. Partly sunny, with a high near 29. Blustery.

    High: 29 °F

    Chance Snow
    and Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around 14. Blustery.

    Low: 14 °F

    Mostly Clear
    and Blustery
    then Partly
    Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 44. Southwest wind 11 to 17 mph, with gusts as high as 30 mph.
Friday
Partly sunny, with a high near 60. West wind 11 to 16 mph, with gusts as high as 26 mph.
Friday Night
Mostly clear, with a low around 36. Northwest wind around 6 mph becoming calm.
Saturday
Mostly sunny, with a high near 65. East wind 6 to 11 mph, with gusts as high as 20 mph.
Saturday Night
Mostly cloudy, with a low around 55. Southeast wind 10 to 14 mph, with gusts as high as 24 mph.
Sunday
Rain, with thunderstorms also possible after 4pm. High near 69. Breezy. Chance of precipitation is 80%.
Sunday Night
Rain before 1am, then a chance of snow. Some thunder is also possible. Low around 23. Blustery. Chance of precipitation is 90%.
Monday
A 30 percent chance of snow before 1pm. Partly sunny, with a high near 29. Blustery.
Monday Night
Mostly clear, with a low around 14. Blustery.
Tuesday
Mostly sunny, with a high near 36.
Tuesday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 20%.
Wednesday
Mostly cloudy, with a high near 59.
Wednesday Night
Partly cloudy, with a low around 40.
Thursday
Sunny, with a high near 70.
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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:
2:31 am CDT Mar 13, 2026
Forecast Valid:
2am CDT Mar 13, 2026-6pm CDT Mar 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation