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.

Mostly Cloudy

73°F

23°C

Humidity 74%
Wind Speed S 10 G 18 mph
Barometer 29.68 in (1004.5 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 11 Mar 2:53 am CDT
Extended Forecast for

Swansea IL

  • Overnight

    Overnight: Rain and thunderstorms likely, then rain and possibly a thunderstorm after 5am. Some of the storms could produce heavy rainfall. Low around 61. Southwest wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.

    Low: 61 °F

    Heavy Rain

  • Wednesday

    Wednesday: Rain and thunderstorms before 1pm, then a chance of rain. Temperature falling to around 48 by 4pm. Breezy, with a southwest wind 13 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%.

    High: 65 °F⇓

    T-storms then
    Rain Likely
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy during the early evening, then gradual clearing, with a low around 32. Northwest wind 13 to 18 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 29 mph.

    Low: 32 °F

    Gradual
    Clearing

  • Thursday

    Thursday: Sunny, with a high near 54. Calm wind becoming southwest 5 to 9 mph in the morning.

    High: 54 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 44. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 44 °F

    Partly Cloudy
    then Partly
    Cloudy and
    Breezy

  • Friday

    Friday: Partly sunny, with a high near 62.

    High: 62 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 37.

    Low: 37 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Rain and thunderstorms likely, then rain and possibly a thunderstorm after 5am. Some of the storms could produce heavy rainfall. Low around 61. Southwest wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.
Wednesday
Rain and thunderstorms before 1pm, then a chance of rain. Temperature falling to around 48 by 4pm. Breezy, with a southwest wind 13 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%.
Wednesday Night
Mostly cloudy during the early evening, then gradual clearing, with a low around 32. Northwest wind 13 to 18 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 29 mph.
Thursday
Sunny, with a high near 54. Calm wind becoming southwest 5 to 9 mph in the morning.
Thursday Night
Partly cloudy, with a low around 44. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph.
Friday
Partly sunny, with a high near 62.
Friday Night
Partly cloudy, with a low around 37.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
Mostly cloudy, with a low around 54.
Sunday
Rain likely and possibly a thunderstorm, then rain after 1pm. High near 65. Breezy. Chance of precipitation is 80%.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 26. Blustery. Chance of precipitation is 30%.
Monday
Sunny, with a high near 39.
Monday Night
Partly cloudy, with a low around 21.
Tuesday
Partly sunny, with a high near 42.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Swansea IL
 38.55°N 90.01°W (Elev. 548 ft)
Last Update:
3:01 am CDT Mar 11, 2026
Forecast Valid:
3am CDT Mar 11, 2026-6pm CDT Mar 17, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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