Severe Thunderstorms and Heavy Rainfall for the Southwest; Heat Spreads Across the Center of the Nation

Moisture will continue to move into areas of the West. This will increase showers and thunderstorms coverage and intensity, with the risk of flash flooding and damaging wind gusts. Meanwhile, heat across the Southwest will expand into the center of the nation this weekend into early next week. Trends favor this heat will spread across the Ohio Valley, mid-Atlantic next week. Read More >

Current conditions at

St. Louis, Spirit Of St. Louis Airport (KSUS)

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

88°F

31°C

Humidity 40%
Wind Speed SE 6 mph
Barometer 30.06 in (1017.1 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 29 Aug 2:54 pm CDT
Extended Forecast for

Lake St. Louis MO

  • Tonight

    Tonight: Partly cloudy, with a low around 70. South wind around 6 mph.

    Low: 70 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 96. Heat index values as high as 100. South wind 6 to 8 mph.

    High: 96 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74. South wind 5 to 7 mph.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 99. Heat index values as high as 104. Southwest wind 6 to 8 mph.

    High: 99 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 78. South wind 3 to 6 mph.

    Low: 78 °F

    Mostly Clear

  • Tuesday

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

    High: 100 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 79.

    Low: 79 °F

    Mostly Clear

  • Wednesday

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

    High: 100 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 79.

    Low: 79 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 70. South wind around 6 mph.
Sunday
Mostly sunny, with a high near 96. Heat index values as high as 100. South wind 6 to 8 mph.
Sunday Night
Mostly clear, with a low around 74. South wind 5 to 7 mph.
Monday
Sunny and hot, with a high near 99. Heat index values as high as 104. Southwest wind 6 to 8 mph.
Monday Night
Mostly clear, with a low around 78. South wind 3 to 6 mph.
Tuesday
Sunny and hot, with a high near 100.
Tuesday Night
Mostly clear, with a low around 79.
Wednesday
Sunny and hot, with a high near 100.
Wednesday Night
Mostly clear, with a low around 79.
Thursday
Sunny and hot, with a high near 99.
Thursday Night
Mostly clear, with a low around 77.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 96.
Friday Night
Partly cloudy, with a low around 74.
Saturday
Mostly sunny, with a high near 94.
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ABOUT THIS FORECAST

 
Point Forecast:
Lake St. Louis MO
 38.79°N 90.79°W (Elev. 512 ft)
1:26 pm CDT Aug 29, 2026
3pm CDT Aug 29, 2026-6pm CDT Sep 5, 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