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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Cahokia IL

Heat Advisory June 25, 02:42pm until June 26, 09:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 25, 02:42pm until June 26, 09:00pm

    NOW until 9:00pm Thu

    Heat Advisory

  • This Afternoon

    High: 96 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 9pm. Mostly clear, with a low around 76. South wind around 6 mph becoming calm in the evening.

    Low: 76 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 96. Heat index values as high as 106. Southwest wind 3 to 8 mph.

    High: 96 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 77. Southwest wind 3 to 6 mph.

    Low: 77 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Southwest wind 5 to 9 mph. Chance of precipitation is 40%.

    High: 94 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.

    Low: 74 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.

    High: 93 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 75.

    Low: 75 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 96. Heat index values as high as 105. South wind 3 to 6 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 9pm. Mostly clear, with a low around 76. South wind around 6 mph becoming calm in the evening.
Thursday
A 20 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 96. Heat index values as high as 106. Southwest wind 3 to 8 mph.
Thursday Night
Partly cloudy, with a low around 77. Southwest wind 3 to 6 mph.
Friday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Southwest wind 5 to 9 mph. Chance of precipitation is 40%.
Friday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.
Saturday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 75.
Sunday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 94.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.
Monday
Showers and thunderstorms likely. Partly sunny, with a high near 92. Chance of precipitation is 60%.
Monday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.55°N 90.18°W (Elev. 407 ft)
Last Update:
2:36 pm CDT Jun 25, 2025
Forecast Valid:
2pm CDT Jun 25, 2025-6pm CDT Jul 1, 2025
 
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