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.

Partly Cloudy

84°F

29°C

Humidity 48%
Wind Speed W 3 mph
Barometer 29.95 in (1013.8 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 20 Jun 3:53 pm CDT
Extended Forecast for

Swansea IL

Flood Watch June 21, 07:00am until June 22, 07:00am
Click here for hazard details and duration
Flood Watch

  • This Afternoon

    This Afternoon: Isolated showers and thunderstorms. Mostly cloudy, with a high near 85. Light northwest wind. Chance of precipitation is 20%.

    High: 85 °F

    Isolated
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 67. Northeast wind around 6 mph becoming light and variable.

    Low: 67 °F

    Partly Cloudy

  • Sunday

    Sunday: Showers and thunderstorms, mainly before 3pm. High near 85. Southeast wind 7 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 80%.

    High: 85 °F

    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms before 4am, then isolated showers. Low around 68. Southwest wind 9 to 11 mph becoming northwest in the evening. Winds could gust as high as 21 mph. Chance of precipitation is 90%.

    Low: 68 °F

    T-storms then
    Scattered
    T-storms

  • Monday

    Monday: Isolated showers before 10am. Mostly cloudy, with a high near 78. North wind 8 to 10 mph. Chance of precipitation is 20%.

    High: 78 °F

    Isolated
    Showers then
    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Isolated showers and thunderstorms. Mostly cloudy, with a high near 85. Light northwest wind. Chance of precipitation is 20%.
Tonight
Partly cloudy, with a low around 67. Northeast wind around 6 mph becoming light and variable.
Sunday
Showers and thunderstorms, mainly before 3pm. High near 85. Southeast wind 7 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 80%.
Sunday Night
Showers and thunderstorms before 4am, then isolated showers. Low around 68. Southwest wind 9 to 11 mph becoming northwest in the evening. Winds could gust as high as 21 mph. Chance of precipitation is 90%.
Monday
Isolated showers before 10am. Mostly cloudy, with a high near 78. North wind 8 to 10 mph. Chance of precipitation is 20%.
Monday Night
Partly cloudy, with a low around 62.
Tuesday
Mostly sunny, with a high near 81.
Tuesday Night
Mostly clear, with a low around 64.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 64.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 64.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Friday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
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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:
2:51 pm CDT Jun 20, 2026
Forecast Valid:
4pm CDT Jun 20, 2026-6pm CDT Jun 27, 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