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.

Partly Cloudy

67°F

19°C

Humidity 91%
Wind Speed S 3 mph
Barometer 30.00 in (1015.1 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 20 Jun 3:54 am CDT
Extended Forecast for

Lake St. Louis MO

Flood Watch June 21, 07:00am until June 22, 01:00am
Click here for hazard details and duration
Flood Watch

  • Overnight

    Overnight: Mostly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 84. Calm wind.

    High: 84 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 67. Calm wind becoming southeast around 5 mph after midnight.

    Low: 67 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: Showers and thunderstorms. Some of the storms could produce heavy rainfall. High near 83. Southeast wind 7 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%.

    High: 83 °F

    Heavy Rain

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before 1am. Low around 63. Southwest wind 7 to 9 mph becoming northwest after midnight. Chance of precipitation is 80%.

    Low: 63 °F

    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 78.

    High: 78 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 66. Calm wind.
Saturday
Mostly sunny, with a high near 84. Calm wind.
Saturday Night
A 20 percent chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 67. Calm wind becoming southeast around 5 mph after midnight.
Sunday
Showers and thunderstorms. Some of the storms could produce heavy rainfall. High near 83. Southeast wind 7 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%.
Sunday Night
Showers and thunderstorms, mainly before 1am. Low around 63. Southwest wind 7 to 9 mph becoming northwest after midnight. Chance of precipitation is 80%.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 78.
Monday Night
Partly cloudy, with a low around 59.
Tuesday
Mostly sunny, with a high near 81.
Tuesday Night
Mostly clear, with a low around 61.
Wednesday
Mostly sunny, with a high near 83.
Wednesday Night
Partly cloudy, with a low around 61.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
Thursday Night
A 30 percent chance of showers. Partly cloudy, with a low around 61.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
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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:
2:56 am CDT Jun 20, 2026
Forecast Valid:
4am CDT Jun 20, 2026-6pm CDT Jun 26, 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