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.

Overcast

77°F

25°C

Humidity 85%
Wind Speed Calm
Barometer 29.94 in (1013.5 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 26 Jun 12:53 pm CDT
Extended Forecast for

Swansea IL

Flood Watch June 26, 01:05pm until June 26, 07:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch June 26, 01:05pm until June 26, 07:00pm

    NOW until 7:00pm Fri

    Flood Watch

  • This Afternoon

    High: 81 °F

    Showers

  • Tonight

    Tonight: Showers and possibly a thunderstorm before 10pm, then a chance of showers and thunderstorms, mainly between 10pm and 4am. Some of the storms could produce heavy rainfall. Low around 69. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 80%.

    Low: 69 °F

    Heavy Rain
    then Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly before 8am. Partly sunny, with a high near 84. Light west wind.

    High: 84 °F

    Chance
    Showers then
    Partly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms, mainly between 8pm and 3am. Mostly cloudy, with a low around 72. Calm wind becoming southeast around 5 mph after midnight.

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 94. South wind 6 to 9 mph.

    High: 94 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 76.

    Low: 76 °F

    Clear

Detailed Forecast

This Afternoon
Showers and possibly a thunderstorm. High near 81. South wind around 8 mph. Chance of precipitation is 80%.
Tonight
Showers and possibly a thunderstorm before 10pm, then a chance of showers and thunderstorms, mainly between 10pm and 4am. Some of the storms could produce heavy rainfall. Low around 69. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 80%.
Saturday
A 30 percent chance of showers and thunderstorms, mainly before 8am. Partly sunny, with a high near 84. Light west wind.
Saturday Night
A 40 percent chance of showers and thunderstorms, mainly between 8pm and 3am. Mostly cloudy, with a low around 72. Calm wind becoming southeast around 5 mph after midnight.
Sunday
Sunny, with a high near 94. South wind 6 to 9 mph.
Sunday Night
Mostly clear, with a low around 76.
Monday
Sunny, with a high near 96.
Monday Night
Clear, with a low around 76.
Tuesday
Sunny and hot, with a high near 97.
Tuesday Night
Clear, with a low around 77.
Wednesday
Sunny and hot, with a high near 97.
Wednesday Night
Mostly clear, with a low around 77.
Thursday
Sunny and hot, with a high near 97.
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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:
1:01 pm CDT Jun 26, 2026
Forecast Valid:
1pm CDT Jun 26, 2026-6pm CDT Jul 2, 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