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 30.00 in (1015.3 mb)
Dewpoint 74°F (23°C)
Visibility 8.00 mi
Heat Index76°F (24°C)
Last update 18 Aug 4:53 am CDT
Extended Forecast for

Scott Air Force Base / Belleville IL

Heat Advisory August 18, 05:34am until August 18, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 18, 05:34am until August 18, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • Today

    High: 95 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 74. Light southeast wind.

    Low: 74 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93. Heat index values as high as 107. Calm wind becoming west around 5 mph in the afternoon.

    High: 93 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 74. Light north wind. Chance of precipitation is 30%.

    Low: 74 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 88. North wind 3 to 8 mph.

    High: 88 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 95. Heat index values as high as 109. Calm wind becoming south around 6 mph in the morning.
Tonight
Partly cloudy, with a low around 74. Light southeast wind.
Tuesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93. Heat index values as high as 107. Calm wind becoming west around 5 mph in the afternoon.
Tuesday Night
A chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 74. Light north wind. Chance of precipitation is 30%.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 88. North wind 3 to 8 mph.
Wednesday Night
Partly cloudy, with a low around 66.
Thursday
Mostly sunny, with a high near 85.
Thursday Night
Mostly clear, with a low around 65.
Friday
Sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 66.
Saturday
Sunny, with a high near 87.
Saturday Night
Mostly clear, with a low around 63.
Sunday
Sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Scott Air Force Base / Belleville IL
 38.52°N 89.84°W (Elev. 427 ft)
Last Update:
4:16 am CDT Aug 18, 2025
Forecast Valid:
5am CDT Aug 18, 2025-6pm CDT Aug 24, 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