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

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

91°F

33°C

Humidity 35%
Wind Speed S 10 G 18 mph
Barometer 29.89 in (1011.7 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 12 Oct 1:53 pm CDT
Extended Forecast for

Cahokia / St. Louis, St. Louis Downtown Airport IL

  • Columbus Day

    Columbus Day: Sunny, with a high near 95. Southwest wind around 11 mph, with gusts as high as 20 mph.

    High: 95 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 69. Southwest wind 5 to 9 mph.

    Low: 69 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 96. Heat index values as high as 102. Southwest wind 5 to 8 mph.

    High: 96 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 72. South wind 5 to 8 mph. Chance of precipitation is 60%.

    Low: 72 °F

    Mostly Clear
    then Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 83. Calm wind becoming west around 5 mph. Chance of precipitation is 100%.

    High: 83 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.

    Low: 68 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 84. Chance of precipitation is 80%.

    High: 84 °F

    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 55. Chance of precipitation is 30%.

    Low: 55 °F

    Chance
    Showers

  • Friday

    Friday: Partly sunny, with a high near 65. Breezy.

    High: 65 °F

    Partly Sunny
    and Breezy

Detailed Forecast

Columbus Day
Sunny, with a high near 95. Southwest wind around 11 mph, with gusts as high as 20 mph.
Tonight
Mostly clear, with a low around 69. Southwest wind 5 to 9 mph.
Tuesday
Sunny, with a high near 96. Heat index values as high as 102. Southwest wind 5 to 8 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 72. South wind 5 to 8 mph. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm. High near 83. Calm wind becoming west around 5 mph. Chance of precipitation is 100%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Thursday
Showers and possibly a thunderstorm. High near 84. Chance of precipitation is 80%.
Thursday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 55. Chance of precipitation is 30%.
Friday
Partly sunny, with a high near 65. Breezy.
Friday Night
Mostly clear, with a low around 42.
Saturday
Sunny, with a high near 64.
Saturday Night
Mostly clear, with a low around 40.
Sunday
Sunny, with a high near 72.
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ABOUT THIS FORECAST

 
Point Forecast:
Cahokia / St. Louis, St. Louis Downtown Airport IL
 38.6°N 90.15°W (Elev. 407 ft)
Last Update:
1:25 pm CDT Oct 12, 2026
Forecast Valid:
2pm CDT Oct 12, 2026-6pm CDT Oct 18, 2026
 
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Additional Resources

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Chance of Precipitation