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.

Overcast

70°F

21°C

Humidity 87%
Wind Speed S 5 mph
Barometer 30.04 in (1017.0 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 25 Jul 1:53 am CDT
Extended Forecast for

3 Miles WNW Belleville IL

Heat Advisory July 26, 11:00am until July 27, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: A 50 percent chance of showers and thunderstorms. Cloudy, with a low around 69. South wind around 5 mph.

    Low: 69 °F

    Chance
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms, mainly before 10am. Mostly cloudy, with a high near 87. South wind 3 to 6 mph.

    High: 87 °F

    Chance
    Showers then
    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 73. Light southeast wind.

    Low: 73 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 94. Heat index values as high as 109. Light and variable wind.

    High: 94 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 76. Calm wind becoming southwest around 5 mph after midnight.

    Low: 76 °F

    Partly Cloudy

  • Monday

    Monday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 78.

    Low: 78 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 50 percent chance of showers and thunderstorms. Cloudy, with a low around 69. South wind around 5 mph.
Saturday
A 50 percent chance of showers and thunderstorms, mainly before 10am. Mostly cloudy, with a high near 87. South wind 3 to 6 mph.
Saturday Night
Partly cloudy, with a low around 73. Light southeast wind.
Sunday
Mostly sunny, with a high near 94. Heat index values as high as 109. Light and variable wind.
Sunday Night
Partly cloudy, with a low around 76. Calm wind becoming southwest around 5 mph after midnight.
Monday
Sunny and hot, with a high near 98.
Monday Night
Mostly clear, with a low around 78.
Tuesday
Sunny, with a high near 94.
Tuesday Night
Partly cloudy, with a low around 72.
Wednesday
Sunny, with a high near 92.
Wednesday Night
Mostly clear, with a low around 71.
Thursday
Mostly sunny, with a high near 92.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Belleville IL
 38.55°N 90.06°W (Elev. 568 ft)
Last Update:
1:26 am CDT Jul 25, 2026
Forecast Valid:
2am CDT Jul 25, 2026-6pm CDT Jul 31, 2026
 
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