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.

Light Rain Fog/Mist

69°F

21°C

Humidity 96%
Wind Speed S 3 mph
Barometer 30.01 in (1015.8 mb)
Dewpoint 68°F (20°C)
Visibility 6.00 mi
Last update 25 Jul 5:53 am CDT
Extended Forecast for

Belleville IL

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

  • Today

    Today: Showers and possibly a thunderstorm before 7am, then a chance of showers and thunderstorms between 7am and 11am. High near 88. Heat index values as high as 100. South wind 3 to 6 mph. Chance of precipitation is 80%.

    High: 88 °F

    Showers then
    Partly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 73. Light southeast wind.

    Low: 73 °F

    Mostly Clear

  • 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 75. Calm wind becoming southwest around 5 mph after midnight.

    Low: 75 °F

    Partly Cloudy

  • Monday

    Monday: Sunny and hot, with a high near 99. Southwest wind 5 to 9 mph.

    High: 99 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Tuesday Night

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

    Low: 72 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

Detailed Forecast

Today
Showers and possibly a thunderstorm before 7am, then a chance of showers and thunderstorms between 7am and 11am. High near 88. Heat index values as high as 100. South wind 3 to 6 mph. Chance of precipitation is 80%.
Tonight
Mostly clear, 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 75. Calm wind becoming southwest around 5 mph after midnight.
Monday
Sunny and hot, with a high near 99. Southwest wind 5 to 9 mph.
Monday Night
Mostly clear, with a low around 77.
Tuesday
Sunny, with a high near 95.
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 30 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:
Belleville IL
 38.52°N 90.01°W (Elev. 535 ft)
Last Update:
5:36 am CDT Jul 25, 2026
Forecast Valid:
6am 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