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

60°F

16°C

Humidity 58%
Wind Speed SE 6 mph
Barometer 29.96 in (1014.2 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 15 May 12:53 am CDT
Extended Forecast for

4 Miles SE Cahokia IL

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 57. Southeast wind 9 to 11 mph, with gusts as high as 20 mph.

    Low: 57 °F

    Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a high near 85. South wind 11 to 14 mph, with gusts as high as 23 mph.

    High: 85 °F

    Chance
    T-storms then
    Mostly Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 68. South wind around 10 mph.

    Low: 68 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly before noon. Mostly cloudy, with a high near 85. South wind around 9 mph. Chance of precipitation is 60%.

    High: 85 °F

    Showers
    Likely then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 66. South wind 7 to 9 mph.

    Low: 66 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 57. Southeast wind 9 to 11 mph, with gusts as high as 20 mph.
Friday
A 30 percent chance of showers and thunderstorms, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a high near 85. South wind 11 to 14 mph, with gusts as high as 23 mph.
Friday Night
A 20 percent chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 68. South wind around 10 mph.
Saturday
Showers and thunderstorms likely, mainly before noon. Mostly cloudy, with a high near 85. South wind around 9 mph. Chance of precipitation is 60%.
Saturday Night
Partly cloudy, with a low around 66. South wind 7 to 9 mph.
Sunday
Sunny, with a high near 90.
Sunday Night
Mostly clear, with a low around 71.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91.
Monday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 88. Chance of precipitation is 70%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 79.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SE Cahokia IL
 38.53°N 90.12°W (Elev. 499 ft)
Last Update:
12:56 am CDT May 15, 2026
Forecast Valid:
1am CDT May 15, 2026-6pm CDT May 21, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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