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.

Overcast

72°F

22°C

Humidity 94%
Wind Speed NW 12 mph
Barometer 30.03 in (1015.8 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 14 Oct 9:51 am CDT
Extended Forecast for

Saint Charles MO

  • Today

    Today: Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Cloudy, with a high near 77. North wind around 6 mph. Chance of precipitation is 70%.

    High: 77 °F

    Showers
    Likely then
    Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Cloudy, with a low around 66. North wind around 6 mph becoming light and variable. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms, mainly before 2pm, then showers likely and possibly a thunderstorm after 5pm. High near 81. East wind 6 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 90%.

    High: 81 °F

    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 49. West wind 7 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.

    Low: 49 °F

    Showers

  • Friday

    Friday: Mostly sunny, with a high near 59. Breezy, with a northwest wind 18 to 20 mph, with gusts as high as 31 mph.

    High: 59 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 41.

    Low: 41 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

Detailed Forecast

Today
Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Cloudy, with a high near 77. North wind around 6 mph. Chance of precipitation is 70%.
Tonight
A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Cloudy, with a low around 66. North wind around 6 mph becoming light and variable. Chance of precipitation is 30%.
Thursday
Showers and thunderstorms, mainly before 2pm, then showers likely and possibly a thunderstorm after 5pm. High near 81. East wind 6 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 90%.
Thursday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 49. West wind 7 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Friday
Mostly sunny, with a high near 59. Breezy, with a northwest wind 18 to 20 mph, with gusts as high as 31 mph.
Friday Night
Mostly clear, with a low around 41.
Saturday
Sunny, with a high near 62.
Saturday Night
Clear, with a low around 41.
Sunday
Sunny, with a high near 69.
Sunday Night
Partly cloudy, with a low around 46.
Monday
Mostly sunny, with a high near 72.
Monday Night
Partly cloudy, with a low around 50.
Tuesday
Mostly sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Charles MO
 38.78°N 90.51°W (Elev. 597 ft)
Last Update:
5:06 am CDT Oct 14, 2026
Forecast Valid:
10am CDT Oct 14, 2026-6pm CDT Oct 20, 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