National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Flooding Possible in the Southwest U.S.; Coastal Storm to Impact the East

Heavy to excessive rainfall is expected today into Wednesday over New Mexico into far west Texas. Flash flooding and debris flows in wildfire burn areas will be possible. A strong coastal storm will develop off the Mid-Atlantic coast Wednesday, intensifying toward southern New England this weekend. Significant coastal flooding, strong rip currents, and beach erosion from high surf expected. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Mostly Cloudy

66°F

19°C

Humidity 84%
Wind Speed Calm
Barometer 30.15 in (1020.8 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 22 Sep 7:53 pm CDT
Extended Forecast for

Cahokia IL

  • Tonight

    Tonight: Partly cloudy, with a low around 58. Light and variable wind becoming northeast 5 to 8 mph in the evening.

    Low: 58 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 77. North wind 5 to 9 mph.

    High: 77 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Cloudy, then gradually becoming partly cloudy, with a low around 58. North wind 5 to 8 mph becoming calm after midnight.

    Low: 58 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Partly sunny, with a high near 79. Northeast wind 3 to 6 mph.

    High: 79 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 60. Northeast wind around 5 mph becoming calm in the evening.

    Low: 60 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 81.

    High: 81 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 57.

    Low: 57 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 77.

    High: 77 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 58.

    Low: 58 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
Partly cloudy, with a low around 58. Light and variable wind becoming northeast 5 to 8 mph in the evening.
Wednesday
Mostly cloudy, with a high near 77. North wind 5 to 9 mph.
Wednesday Night
Cloudy, then gradually becoming partly cloudy, with a low around 58. North wind 5 to 8 mph becoming calm after midnight.
Thursday
Partly sunny, with a high near 79. Northeast wind 3 to 6 mph.
Thursday Night
Partly cloudy, with a low around 60. Northeast wind around 5 mph becoming calm in the evening.
Friday
Partly sunny, with a high near 81.
Friday Night
Mostly cloudy, with a low around 57.
Saturday
Mostly cloudy, with a high near 77.
Saturday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 58.
Sunday
Partly sunny, with a high near 81.
Sunday Night
Partly cloudy, with a low around 60.
Monday
Mostly sunny, with a high near 84.
Monday Night
A 20 percent chance of showers. Partly cloudy, with a low around 62.
Tuesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.57°N 90.18°W (Elev. 407 ft)
Last Update:
7:36 pm CDT Sep 22, 2026
Forecast Valid:
8pm CDT Sep 22, 2026-6pm CDT Sep 29, 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