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

76°F

24°C

Humidity 94%
Wind Speed Calm
Barometer 29.89 in (1011.5 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 29 Jun 2:53 am CDT
Extended Forecast for

3 Miles SSE Belleville IL

Extreme Heat Warning June 29, 03:34am until July 3, 10:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning June 29, 03:34am until July 3, 10:00pm

    NOW until 10:00pm Fri

    Extreme Heat Warning

  • Overnight

    Low: 75 °F

    Partly Cloudy

  • Monday

    Monday: Sunny and hot, with a high near 97. Heat index values as high as 112. South wind 6 to 11 mph, with gusts as high as 21 mph.

    High: 97 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 76. South wind 6 to 11 mph becoming light after midnight.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 98. Heat index values as high as 111. Light south wind increasing to 5 to 9 mph in the morning.

    High: 98 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 75. South wind 3 to 7 mph.

    Low: 75 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Wednesday Night

    Wednesday Night: Clear, with a low around 77.

    Low: 77 °F

    Clear

  • Thursday

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

    High: 98 °F

    Hot

Detailed Forecast

Overnight
Partly cloudy, with a low around 75. South wind around 5 mph.
Monday
Sunny and hot, with a high near 97. Heat index values as high as 112. South wind 6 to 11 mph, with gusts as high as 21 mph.
Monday Night
Mostly clear, with a low around 76. South wind 6 to 11 mph becoming light after midnight.
Tuesday
Sunny and hot, with a high near 98. Heat index values as high as 111. Light south wind increasing to 5 to 9 mph in the morning.
Tuesday Night
Clear, with a low around 75. South wind 3 to 7 mph.
Wednesday
Sunny and hot, with a high near 97.
Wednesday Night
Clear, with a low around 77.
Thursday
Sunny and hot, with a high near 98.
Thursday Night
Mostly clear, with a low around 77.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96.
Friday Night
Partly cloudy, with a low around 77.
Independence Day
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE Belleville IL
 38.5°N 89.98°W (Elev. 495 ft)
Last Update:
2:41 am CDT Jun 29, 2026
Forecast Valid:
3am CDT Jun 29, 2026-6pm CDT Jul 5, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation