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

64°F

18°C

Humidity 73%
Wind Speed SE 7 mph
Barometer 29.99 in (1014.7 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 17 Oct 6:51 am CDT
Extended Forecast for

Saint Charles MO

  • Today

    Today: Mostly sunny, with a high near 83. South wind 5 to 10 mph.

    High: 83 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 64. South wind around 9 mph.

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. Some of the storms could produce heavy rainfall. High near 79. Southwest wind 7 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 90%.

    High: 79 °F

    Showers then
    Heavy Rain

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 49. Southwest wind 8 to 15 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 80%.

    Low: 49 °F

    T-storms then
    Showers

  • Sunday

    Sunday: Sunny, with a high near 64. Northwest wind 14 to 16 mph, with gusts as high as 28 mph.

    High: 64 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 46.

    Low: 46 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 83. South wind 5 to 10 mph.
Tonight
Partly cloudy, with a low around 64. South wind around 9 mph.
Saturday
A slight chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. Some of the storms could produce heavy rainfall. High near 79. Southwest wind 7 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 90%.
Saturday Night
Showers and possibly a thunderstorm. Low around 49. Southwest wind 8 to 15 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 80%.
Sunday
Sunny, with a high near 64. Northwest wind 14 to 16 mph, with gusts as high as 28 mph.
Sunday Night
Clear, with a low around 46.
Monday
Sunny, with a high near 74.
Monday Night
Mostly clear, with a low around 50.
Tuesday
Sunny, with a high near 66.
Tuesday Night
Mostly clear, with a low around 42.
Wednesday
Sunny, with a high near 69.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 49.
Thursday
A 20 percent chance of showers. Mostly sunny, with a high near 67.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Charles MO
 38.81°N 90.54°W (Elev. 512 ft)
Last Update:
6:21 am CDT Oct 17, 2025
Forecast Valid:
6am CDT Oct 17, 2025-6pm CDT Oct 23, 2025
 
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