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

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

A Few Clouds

73°F

23°C

Humidity 53%
Wind Speed SW 8 mph
Barometer 29.91 in (1011.5 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 13 Oct 6:51 am CDT
Extended Forecast for

Saint Charles MO

  • Today

    Today: Sunny, with a high near 94. Southwest wind 6 to 9 mph.

    High: 94 °F

    Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 72. South wind 5 to 8 mph becoming west after midnight. Chance of precipitation is 60%.

    Low: 72 °F

    Mostly Clear
    then Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm, mainly before 2pm, then a chance of showers and thunderstorms after 2pm. High near 81. Light and variable wind becoming northwest around 5 mph. Chance of precipitation is 100%.

    High: 81 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm, mainly after 1am. Low around 66. Light east wind. Chance of precipitation is 80%.

    Low: 66 °F

    Slight Chance
    Showers then
    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 81. Southeast wind 6 to 8 mph becoming southwest in the afternoon. Chance of precipitation is 90%.

    High: 81 °F

    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 51. Chance of precipitation is 50%.

    Low: 51 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 63. Breezy.

    High: 63 °F

    Mostly Sunny
    and Breezy
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 94. Southwest wind 6 to 9 mph.
Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 72. South wind 5 to 8 mph becoming west after midnight. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm, mainly before 2pm, then a chance of showers and thunderstorms after 2pm. High near 81. Light and variable wind becoming northwest around 5 mph. Chance of precipitation is 100%.
Wednesday Night
Showers and possibly a thunderstorm, mainly after 1am. Low around 66. Light east wind. Chance of precipitation is 80%.
Thursday
Showers and possibly a thunderstorm. High near 81. Southeast wind 6 to 8 mph becoming southwest in the afternoon. Chance of precipitation is 90%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 51. Chance of precipitation is 50%.
Friday
Mostly sunny, with a high near 63. Breezy.
Friday Night
Mostly clear, with a low around 40.
Saturday
Sunny, with a high near 63.
Saturday Night
Clear, with a low around 40.
Sunday
Sunny, with a high near 71.
Sunday Night
Partly cloudy, with a low around 48.
Monday
Mostly sunny, with a high near 75.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Charles MO
 38.8°N 90.51°W (Elev. 499 ft)
Last Update:
6:11 am CDT Oct 13, 2026
Forecast Valid:
7am CDT Oct 13, 2026-6pm CDT Oct 19, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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