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

Hazardous Weather Conditions

Current conditions at

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

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Mostly Cloudy

77°F

25°C

Humidity 88%
Wind Speed SE 3 mph
Barometer 29.88 in (1011.1 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 26 Jun 5:54 pm CDT
Extended Forecast for

Lake St. Louis MO

Flood Watch June 26, 06:35pm until June 26, 07:00pm
Click here for hazard details and duration
...
  •  
    Flood Watch June 26, 06:35pm until June 26, 07:00pm

    NOW until 7:00pm Fri

    Flood Watch

  • Tonight

    Low: 67 °F

    T-storms
    Likely then
    Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers, with thunderstorms also possible after 10am. Mostly cloudy, with a high near 84. West wind 3 to 6 mph. Chance of precipitation is 20%.

    High: 84 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 71. Southeast wind around 6 mph.

    Low: 71 °F

    Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 94. Heat index values as high as 110. South wind 6 to 9 mph.

    High: 94 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74. South wind 5 to 8 mph.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

Detailed Forecast

Tonight
Showers and thunderstorms likely, mainly before 7pm. Mostly cloudy, with a low around 67. South wind around 6 mph becoming calm in the evening. Chance of precipitation is 60%.
Saturday
A slight chance of showers, with thunderstorms also possible after 10am. Mostly cloudy, with a high near 84. West wind 3 to 6 mph. Chance of precipitation is 20%.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 71. Southeast wind around 6 mph.
Sunday
Mostly sunny, with a high near 94. Heat index values as high as 110. South wind 6 to 9 mph.
Sunday Night
Mostly clear, with a low around 74. South wind 5 to 8 mph.
Monday
Sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Sunny, with a high near 96.
Tuesday Night
Clear, with a low around 76.
Wednesday
Sunny, with a high near 96.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
Sunny, with a high near 96.
Thursday Night
Mostly clear, with a low around 76.
Friday
A 40 percent chance of showers and thunderstorms. Sunny, with a high near 95.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lake St. Louis MO
 38.79°N 90.79°W (Elev. 512 ft)
Last Update:
5:41 pm CDT Jun 26, 2026
Forecast Valid:
6pm CDT Jun 26, 2026-6pm CDT Jul 3, 2026
 
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