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.

A Few Clouds

79°F

26°C

Humidity 79%
Wind Speed Calm
Barometer 29.99 in (1014.9 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 17 Jul 7:53 am CDT
Extended Forecast for

Swansea IL

  • Today

    Today: Showers and thunderstorms likely, mainly after 5pm. Mostly cloudy, with a high near 86. Light and variable wind becoming north around 6 mph in the morning. Chance of precipitation is 60%.

    High: 86 °F

    Isolated
    T-storms then
    T-storms
    Likely

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly before 11pm. Mostly cloudy, with a low around 72. Light northeast wind. Chance of precipitation is 40%.

    Low: 72 °F

    Scattered
    T-storms

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. Mostly cloudy, with a high near 89. Light and variable wind becoming southeast around 5 mph in the morning. Chance of precipitation is 70%.

    High: 89 °F

    Showers
    Likely then
    T-storms
    Likely

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 75. South wind 3 to 5 mph.

    Low: 75 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94. South wind 5 to 7 mph.

    High: 94 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 77. Chance of precipitation is 20%.

    Low: 77 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95.

    High: 95 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 77.

    Low: 77 °F

    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.

    High: 96 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
Showers and thunderstorms likely, mainly after 5pm. Mostly cloudy, with a high near 86. Light and variable wind becoming north around 6 mph in the morning. Chance of precipitation is 60%.
Tonight
Scattered showers and thunderstorms, mainly before 11pm. Mostly cloudy, with a low around 72. Light northeast wind. Chance of precipitation is 40%.
Friday
Showers likely and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. Mostly cloudy, with a high near 89. Light and variable wind becoming southeast around 5 mph in the morning. Chance of precipitation is 70%.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 75. South wind 3 to 5 mph.
Saturday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94. South wind 5 to 7 mph.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 77. Chance of precipitation is 20%.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 77.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 78.
Tuesday
Sunny and hot, with a high near 98.
Tuesday Night
Mostly clear, with a low around 79.
Wednesday
Sunny and hot, with a high near 98.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Swansea IL
 38.55°N 90.01°W (Elev. 548 ft)
Last Update:
8:15 am CDT Jul 17, 2025
Forecast Valid:
8am CDT Jul 17, 2025-6pm CDT Jul 23, 2025
 
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