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.

Fair

82°F

28°C

Humidity 38%
Wind Speed S 8 mph
Barometer 29.88 in (1011.4 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 16 Apr 3:53 pm CDT
Extended Forecast for

Cahokia IL

  • Tonight

    Tonight: Mostly clear, with a low around 60. Light south wind.

    Low: 60 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 86. South wind 5 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

    High: 86 °F

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 11pm. Low around 50. South wind 10 to 13 mph becoming west after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 100%.

    Low: 50 °F

    Showers
    Likely then
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers. Mostly cloudy, then gradually becoming sunny, with a high near 62. Northwest wind around 14 mph, with gusts as high as 24 mph.

    High: 62 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 41. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 41 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 54.

    Low: 54 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 60. Light south wind.
Friday
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 86. South wind 5 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.
Friday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 11pm. Low around 50. South wind 10 to 13 mph becoming west after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 100%.
Saturday
A 50 percent chance of showers. Mostly cloudy, then gradually becoming sunny, with a high near 62. Northwest wind around 14 mph, with gusts as high as 24 mph.
Saturday Night
Mostly clear, with a low around 41. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 43.
Monday
Sunny, with a high near 74.
Monday Night
Mostly clear, with a low around 54.
Tuesday
Mostly sunny, with a high near 80.
Tuesday Night
Partly cloudy, with a low around 57.
Wednesday
Mostly sunny, with a high near 80.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.57°N 90.18°W (Elev. 407 ft)
Last Update:
2:41 pm CDT Apr 16, 2026
Forecast Valid:
4pm CDT Apr 16, 2026-6pm CDT Apr 23, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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