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

Hazardous Weather Conditions

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Mostly Cloudy

81°F

27°C

Humidity 69%
Wind Speed W 3 mph
Barometer 29.89 in (1010.9 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 17 Jun 9:51 am CDT
Extended Forecast for

Saint Charles MO

  • Today

    Today: Sunny, with a high near 90. Light southwest wind.

    High: 90 °F

    Sunny

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 73. South wind around 6 mph.

    Low: 73 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 1pm, then showers and thunderstorms after 1pm. High near 83. Southwest wind 8 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.

    High: 83 °F

    Showers
    Likely then
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 67. West wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    T-storms then
    Chance
    Showers

  • Juneteenth

    Juneteenth: Sunny, with a high near 85. Northwest wind 3 to 5 mph.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Friday Night

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

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 90. Light southwest wind.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 73. South wind around 6 mph.
Wednesday
A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 1pm, then showers and thunderstorms after 1pm. High near 83. Southwest wind 8 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
Wednesday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 67. West wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Juneteenth
Sunny, with a high near 85. Northwest wind 3 to 5 mph.
Thursday Night
Mostly clear, with a low around 68.
Friday
Sunny, with a high near 91.
Friday Night
Mostly clear, with a low around 76.
Saturday
Sunny, with a high near 96.
Saturday Night
Mostly clear, with a low around 77.
Sunday
Sunny, with a high near 96.
Sunday Night
Mostly clear, with a low around 76.
Monday
Sunny, with a high near 94.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Charles MO
 38.78°N 90.51°W (Elev. 597 ft)
Last Update:
9:07 am CDT Jun 17, 2025
Forecast Valid:
10am CDT Jun 17, 2025-6pm CDT Jun 23, 2025
 
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