Heavy Rainfall and Severe Thunderstorm Threats; Heat Risk Expands; Monitoring the Tropics

Flash flooding risks continue for portions of the Four Corners and Great Basin through today. Severe thunderstorms are outlooked from the eastern Great Lakes, southern New England into the mid-Atlantic through Tuesday. Heat risk increases and expands across the center of the nation and across the Ohio Valley and mid-Atlantic this week. Continue to closely monitor tropical development in the Gulf. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

74°F

23°C

Humidity 74%
Wind Speed Calm
Barometer 30.03 in (1016.6 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 31 Aug 7:53 am CDT
Extended Forecast for

Crystal City MO

Heat Advisory August 31, 12:00pm until September 4, 08:00pm
Click here for hazard details and duration
Heat Advisory
  • Today

    Today: Sunny and hot, with a high near 99. Heat index values as high as 103. Calm wind becoming southwest around 6 mph in the morning.

    High: 99 °F

    Hot

  • Tonight

    Tonight: Clear, with a low around 74. South wind 3 to 5 mph.

    Low: 74 °F

    Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 100. Heat index values as high as 106. South wind 3 to 5 mph.

    High: 100 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 75. South wind 3 to 5 mph.

    Low: 75 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 99. Calm wind becoming southwest around 5 mph in the morning.

    High: 99 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 100.

    High: 100 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm.  Sunny, with a high near 95.

    High: 95 °F

    Sunny then
    Slight Chance
    T-storms

Detailed Forecast

Today
Sunny and hot, with a high near 99. Heat index values as high as 103. Calm wind becoming southwest around 6 mph in the morning.
Tonight
Clear, with a low around 74. South wind 3 to 5 mph.
Tuesday
Sunny and hot, with a high near 100. Heat index values as high as 106. South wind 3 to 5 mph.
Tuesday Night
Mostly clear, with a low around 75. South wind 3 to 5 mph.
Wednesday
Sunny and hot, with a high near 99. Calm wind becoming southwest around 5 mph in the morning.
Wednesday Night
Mostly clear, with a low around 75.
Thursday
Sunny and hot, with a high near 100.
Thursday Night
Mostly clear, with a low around 74.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 95.
Friday Night
Mostly clear, with a low around 72.
Saturday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 94.
Saturday Night
Mostly clear, with a low around 70.
Sunday
Sunny, with a high near 93.
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ABOUT THIS FORECAST

 
Point Forecast:
Crystal City MO
 38.22°N 90.39°W (Elev. 446 ft)
8:26 am CDT Aug 31, 2026
8am CDT Aug 31, 2026-6pm CDT Sep 6, 2026
 
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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