Showers and Storms in the East; Dangerously Hot and Dry in the West

A frontal boundary will bring scattered showers and storms to portions of the Central and Eastern U.S. through the end of the week. Meanwhile, dangerous heat will intensify across the Intermountain West and expand into the Central U.S. by early next week. Elevated wildfire conditions will develop across portions of the Northern/Central Plains and air quality issues will persist in the Northwest. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

85°F

29°C

Humidity 59%
Wind Speed SE 5 mph
Barometer 30.01 in (1016.0 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 5 Aug 4:53 pm CDT
Extended Forecast for

Swansea IL

Flood Watch August 5, 10:00pm until August 6, 10:00am
Click here for hazard details and duration
Flood Watch
  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly after 3am.  Mostly cloudy, with a low around 72. South wind 5 to 7 mph becoming light and variable  after midnight.

    Low: 72 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly before 2pm.  Mostly cloudy, with a high near 84. Calm wind becoming southwest around 6 mph in the morning.  Chance of precipitation is 70%.

    High: 84 °F

    T-storms
    Likely

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms, mainly after 10pm.  Mostly cloudy, with a low around 71. Calm wind becoming south around 5 mph after midnight.

    Low: 71 °F

    Chance
    T-storms

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms.  Partly sunny, with a high near 87. South wind 5 to 7 mph becoming west in the afternoon.

    High: 87 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms.  Partly cloudy, with a low around 72. Southwest wind 3 to 5 mph.

    Low: 72 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Tonight
A 50 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 72. South wind 5 to 7 mph becoming light and variable after midnight.
Thursday
Showers and thunderstorms likely, mainly before 2pm. Mostly cloudy, with a high near 84. Calm wind becoming southwest around 6 mph in the morning. Chance of precipitation is 70%.
Thursday Night
A 50 percent chance of showers and thunderstorms, mainly after 10pm. Mostly cloudy, with a low around 71. Calm wind becoming south around 5 mph after midnight.
Friday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. South wind 5 to 7 mph becoming west in the afternoon.
Friday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. Southwest wind 3 to 5 mph.
Saturday
Mostly sunny, with a high near 90.
Saturday Night
Mostly clear, with a low around 72.
Sunday
Mostly sunny, with a high near 92.
Sunday Night
Mostly clear, with a low around 75.
Monday
Mostly sunny, with a high near 94.
Monday Night
Mostly clear, with a low around 76.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Swansea IL
 38.55°N 89.95°W (Elev. 541 ft)
4:01 pm CDT Aug 5, 2026
5pm CDT Aug 5, 2026-6pm CDT Aug 12, 2026
 
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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