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

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

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Overcast

71°F

22°C

Humidity 94%
Wind Speed E 6 mph
Barometer 29.98 in (1014.8 mb)
Dewpoint 69°F (21°C)
Visibility 6.00 mi
Last update 15 Oct 9:54 am CDT
Extended Forecast for

Lake St. Louis MO

  • Today

    Today: Showers and possibly a thunderstorm, mainly before noon, then a chance of showers and thunderstorms after noon. Patchy fog before 11am. High near 79. Southeast wind 5 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 80%.

    High: 79 °F

    Showers and
    Patchy Fog
    then Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely before 1am, then isolated showers between 1am and 2am. Increasing clouds, with a low around 46. Northwest wind 10 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 70%.

    Low: 46 °F

    Showers
    Likely

  • Friday

    Friday: Increasing clouds, with a high near 56. Breezy, with a northwest wind 16 to 20 mph, with gusts as high as 29 mph.

    High: 56 °F

    Increasing
    Clouds and
    Breezy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 38. North wind 6 to 15 mph, with gusts as high as 25 mph.

    Low: 38 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 60. Light northeast wind.

    High: 60 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 37.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

Detailed Forecast

Today
Showers and possibly a thunderstorm, mainly before noon, then a chance of showers and thunderstorms after noon. Patchy fog before 11am. High near 79. Southeast wind 5 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 80%.
Tonight
Showers and thunderstorms likely before 1am, then isolated showers between 1am and 2am. Increasing clouds, with a low around 46. Northwest wind 10 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 70%.
Friday
Increasing clouds, with a high near 56. Breezy, with a northwest wind 16 to 20 mph, with gusts as high as 29 mph.
Friday Night
Mostly cloudy, with a low around 38. North wind 6 to 15 mph, with gusts as high as 25 mph.
Saturday
Sunny, with a high near 60. Light northeast wind.
Saturday Night
Clear, with a low around 37.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 39.
Monday
Mostly sunny, with a high near 72.
Monday Night
Partly cloudy, with a low around 41.
Tuesday
Sunny, with a high near 74.
Tuesday Night
Mostly clear, with a low around 45.
Wednesday
Sunny, with a high near 78.
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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:
9:16 am CDT Oct 15, 2026
Forecast Valid:
10am CDT Oct 15, 2026-6pm CDT Oct 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