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.

Fog/Mist

57°F

14°C

Humidity 96%
Wind Speed N 3 mph
Barometer 30.07 in (1018.2 mb)
Dewpoint 56°F (13°C)
Visibility 4.00 mi
Last update 25 Dec 9:53 am CST
Extended Forecast for

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

  • Christmas Day

    Christmas Day: Patchy dense fog before noon. Otherwise, mostly cloudy, with a high near 66. Calm wind becoming east around 5 mph in the afternoon.

    High: 66 °F

    Patchy Dense
    Fog then
    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 56. East wind 6 to 8 mph becoming southwest after midnight.

    Low: 56 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 71. Southwest wind 6 to 10 mph becoming northwest in the afternoon.

    High: 71 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 44. Light and variable wind.

    Low: 44 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 68. Light east wind becoming southeast 5 to 10 mph in the morning.

    High: 68 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 20 percent chance of rain after midnight. Cloudy, with a low around 55.

    Low: 55 °F

    Cloudy then
    Slight Chance
    Rain

  • Sunday

    Sunday: A chance of rain, then rain likely and possibly a thunderstorm after noon. Cloudy, with a high near 66. Chance of precipitation is 70%.

    High: 66 °F

    Rain Likely

  • Sunday Night

    Sunday Night: A chance of rain and snow before midnight. Mostly cloudy, with a low around 20. Chance of precipitation is 40%.

    Low: 20 °F

    Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Monday

    Monday: Sunny, with a high near 29.

    High: 29 °F

    Sunny

Detailed Forecast

Christmas Day
Patchy dense fog before noon. Otherwise, mostly cloudy, with a high near 66. Calm wind becoming east around 5 mph in the afternoon.
Tonight
Mostly cloudy, with a low around 56. East wind 6 to 8 mph becoming southwest after midnight.
Friday
Mostly sunny, with a high near 71. Southwest wind 6 to 10 mph becoming northwest in the afternoon.
Friday Night
Partly cloudy, with a low around 44. Light and variable wind.
Saturday
Mostly cloudy, with a high near 68. Light east wind becoming southeast 5 to 10 mph in the morning.
Saturday Night
A 20 percent chance of rain after midnight. Cloudy, with a low around 55.
Sunday
A chance of rain, then rain likely and possibly a thunderstorm after noon. Cloudy, with a high near 66. Chance of precipitation is 70%.
Sunday Night
A chance of rain and snow before midnight. Mostly cloudy, with a low around 20. Chance of precipitation is 40%.
Monday
Sunny, with a high near 29.
Monday Night
Mostly clear, with a low around 16.
Tuesday
Sunny, with a high near 37.
Tuesday Night
Mostly clear, with a low around 24.
Wednesday
Partly sunny, with a high near 44.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cahokia / St. Louis, St. Louis Downtown Airport IL
 38.57°N 90.15°W (Elev. 407 ft)
Last Update:
8:36 am CST Dec 25, 2025
Forecast Valid:
10am CST Dec 25, 2025-6pm CST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation