Severe Weather and Heavy Rain from the Ohio Valley to the Mid-Atlantic; Heat Persists in the South-Central U.S.

Widespread strong thunderstorms with damaging winds and locally heavy rain are expected across portions of the Ohio Valley into southern Mid-Atlantic and Carolinas. Rounds of strong thunderstorms are expected to develop across the northern and central Plains. Sweltering heat remains most persistent across the South-Central Plains and Lower/Middle Mississippi Valley through next week. Read More >

Current conditions at

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

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

76°F

24°C

Humidity 88%
Wind Speed E 6 mph
Barometer 29.95 in (1013.2 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 6 Sep 4:54 am CDT
Extended Forecast for

Lake St. Louis MO

  • Today

    Today: Mostly sunny, with a high near 91. East wind 3 to 8 mph.

    High: 91 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 64. East wind 3 to 7 mph.

    Low: 64 °F

    Partly Cloudy

  • Labor Day

    Labor Day: Sunny, with a high near 88. Calm wind becoming east around 6 mph in the morning.

    High: 88 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 62. Light east wind.

    Low: 62 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. Calm wind becoming south around 6 mph in the morning.

    High: 95 °F

    Sunny

  • Tuesday Night

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

    Low: 74 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny and hot, with a high near 98.

    High: 98 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am.  Mostly cloudy, with a low around 69. Chance of precipitation is 70%.

    Low: 69 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly before 1pm.  Partly sunny, with a high near 84.

    High: 84 °F

    Chance
    Showers

Detailed Forecast

Today
Mostly sunny, with a high near 91. East wind 3 to 8 mph.
Tonight
Partly cloudy, with a low around 64. East wind 3 to 7 mph.
Labor Day
Sunny, with a high near 88. Calm wind becoming east around 6 mph in the morning.
Monday Night
Mostly clear, with a low around 62. Light east wind.
Tuesday
Sunny, with a high near 95. Calm wind becoming south around 6 mph in the morning.
Tuesday Night
Mostly clear, with a low around 74.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 98.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. Chance of precipitation is 70%.
Thursday
A 50 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 84.
Thursday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 63.
Friday
A 20 percent chance of showers. Sunny, with a high near 86.
Friday Night
A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 65.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 90.
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ABOUT THIS FORECAST

 
Point Forecast:
Lake St. Louis MO
 38.79°N 90.79°W (Elev. 512 ft)
3:51 am CDT Sep 6, 2026
5am CDT Sep 6, 2026-6pm CDT Sep 12, 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