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.

Fog/Mist

72°F

22°C

Humidity 97%
Wind Speed Calm
Barometer 29.88 in (1011.0 mb)
Dewpoint 71°F (22°C)
Visibility 0.75 mi
Last update 27 Jun 1:54 am CDT
Extended Forecast for

3 Miles SW Lake St. Louis MO

Extreme Heat Watch June 28, 12:00pm until July 3, 12:00am
Click here for hazard details and duration
Extreme Heat Watch

  • Overnight

    Overnight: A slight chance of showers and thunderstorms. Patchy fog. Otherwise, mostly cloudy, with a low around 72. Calm wind. Chance of precipitation is 20%.

    Low: 72 °F

    Slight Chance
    T-storms and
    Patchy Fog

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 10am. Patchy fog before 8am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 86. Calm wind. Chance of precipitation is 30%.

    High: 86 °F

    Chance
    Showers and
    Patchy Fog
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms, mainly between 10pm and 4am. Partly cloudy, with a low around 72. Light southeast wind.

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 94. Heat index values as high as 110. South wind 5 to 10 mph.

    High: 94 °F

    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 75.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 75.

    Low: 75 °F

    Clear

Detailed Forecast

Overnight
A slight chance of showers and thunderstorms. Patchy fog. Otherwise, mostly cloudy, with a low around 72. Calm wind. Chance of precipitation is 20%.
Saturday
A chance of showers, with thunderstorms also possible after 10am. Patchy fog before 8am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 86. Calm wind. Chance of precipitation is 30%.
Saturday Night
A 40 percent chance of showers and thunderstorms, mainly between 10pm and 4am. Partly cloudy, with a low around 72. Light southeast wind.
Sunday
Sunny, with a high near 94. Heat index values as high as 110. South wind 5 to 10 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 75.
Tuesday
Sunny and hot, with a high near 98.
Tuesday Night
Clear, with a low around 75.
Wednesday
Sunny and hot, with a high near 97.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
Sunny, with a high near 95.
Thursday Night
Mostly clear, with a low around 75.
Friday
Sunny, with a high near 95.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Lake St. Louis MO
 38.77°N 90.82°W (Elev. 597 ft)
Last Update:
2:26 am CDT Jun 27, 2026
Forecast Valid:
2am CDT Jun 27, 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