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.

Mostly Cloudy

79°F

26°C

Humidity 36%
Wind Speed E 7 mph
Barometer 30.26 in (1023.8 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 14 Oct 12:51 pm CDT
Extended Forecast for

Saint Charles MO

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 82. Light east wind.

    High: 82 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 60. Light east wind.

    Low: 60 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 83. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 83 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 61. Calm wind becoming southeast around 5 mph after midnight.

    Low: 61 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 82. Southeast wind 5 to 9 mph.

    High: 82 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64.

    Low: 64 °F

    Mostly Clear
    then Chance
    T-storms

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 76. Chance of precipitation is 60%.

    High: 76 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 82. Light east wind.
Tonight
Mostly clear, with a low around 60. Light east wind.
Wednesday
Mostly sunny, with a high near 83. Calm wind becoming northeast around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 61. Calm wind becoming southeast around 5 mph after midnight.
Thursday
Sunny, with a high near 82. Southeast wind 5 to 9 mph.
Thursday Night
Partly cloudy, with a low around 61.
Friday
Mostly sunny, with a high near 84.
Friday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64.
Saturday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 76. Chance of precipitation is 60%.
Saturday Night
A 50 percent chance of showers. Partly cloudy, with a low around 51.
Sunday
A 20 percent chance of showers. Sunny, with a high near 67.
Sunday Night
Clear, with a low around 47.
Monday
Sunny, with a high near 73.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Charles MO
 38.78°N 90.54°W (Elev. 515 ft)
Last Update:
10:11 am CDT Oct 14, 2025
Forecast Valid:
1pm CDT Oct 14, 2025-6pm CDT Oct 20, 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