National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Partly Cloudy

97°F

36°C

Humidity 39%
Wind Speed SW 15 G 22 mph
Barometer 30.07 in (1016.6 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index102°F (39°C)
Last update 15 Sep 1:51 pm CDT
Extended Forecast for

Champ MO

Heat Advisory September 15, 02:00pm until September 18, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 15, 02:00pm until September 18, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • This Afternoon

    High: 99 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly after 7pm. Partly cloudy, with a low around 77. Southeast wind around 5 mph becoming calm after midnight. Chance of precipitation is 40%.

    Low: 77 °F

    Scattered
    T-storms

  • Wednesday

    Wednesday: Scattered showers and thunderstorms, mainly before 10am. Partly sunny, with a high near 94. Heat index values as high as 102. Calm wind becoming southwest around 5 mph. Chance of precipitation is 30%.

    High: 94 °F

    Scattered
    T-storms

  • Wednesday Night

    Wednesday Night: Isolated showers and thunderstorms before 8pm. Mostly clear, with a low around 79. South wind 3 to 5 mph. Chance of precipitation is 20%.

    Low: 79 °F

    Isolated
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 98. Southwest wind around 6 mph becoming northwest in the afternoon.

    High: 98 °F

    Hot

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 76.

    Low: 76 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Friday Night

    Friday Night: Partly cloudy, with a low around 76.

    Low: 76 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms after 4pm. Sunny and hot, with a high near 99. Heat index values as high as 103. Southwest wind around 7 mph.
Tonight
Scattered showers and thunderstorms, mainly after 7pm. Partly cloudy, with a low around 77. Southeast wind around 5 mph becoming calm after midnight. Chance of precipitation is 40%.
Wednesday
Scattered showers and thunderstorms, mainly before 10am. Partly sunny, with a high near 94. Heat index values as high as 102. Calm wind becoming southwest around 5 mph. Chance of precipitation is 30%.
Wednesday Night
Isolated showers and thunderstorms before 8pm. Mostly clear, with a low around 79. South wind 3 to 5 mph. Chance of precipitation is 20%.
Thursday
Sunny and hot, with a high near 98. Southwest wind around 6 mph becoming northwest in the afternoon.
Thursday Night
Partly cloudy, with a low around 76.
Friday
Mostly sunny and hot, with a high near 97.
Friday Night
Partly cloudy, with a low around 76.
Saturday
Mostly sunny and hot, with a high near 98.
Saturday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 74.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Sunday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 69.
Monday
A 30 percent chance of showers. Mostly cloudy, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Champ MO
 38.71°N 90.43°W (Elev. 518 ft)
Last Update:
1:26 pm CDT Sep 15, 2026
Forecast Valid:
2pm CDT Sep 15, 2026-6pm CDT Sep 21, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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