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

87°F

31°C

Humidity 31%
Wind Speed E 5 mph
Barometer 29.99 in (1014.3 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 18 Sep 12:51 pm CDT
Extended Forecast for

Saint Charles MO

  • This Afternoon

    This Afternoon: Sunny, with a high near 90. Light south wind.

    High: 90 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 64. Light and variable wind.

    Low: 64 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 92. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 92 °F

    Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 70. South wind 3 to 6 mph.

    Low: 70 °F

    Mostly Clear
    then Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly sunny, with a high near 92. South wind 3 to 6 mph. Chance of precipitation is 30%.

    High: 92 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 89. Chance of precipitation is 20%.

    High: 89 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 71.

    Low: 71 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83.

    High: 83 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 90. Light south wind.
Tonight
Mostly cloudy, then gradually becoming clear, with a low around 64. Light and variable wind.
Thursday
Sunny, with a high near 92. Calm wind becoming south 5 to 7 mph in the afternoon.
Thursday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 70. South wind 3 to 6 mph.
Friday
A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly sunny, with a high near 92. South wind 3 to 6 mph. Chance of precipitation is 30%.
Friday Night
Partly cloudy, with a low around 68.
Saturday
A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 89. Chance of precipitation is 20%.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 71.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83.
Sunday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Monday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 78.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 60.
Tuesday
Mostly sunny, with a high near 77.
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Map Legend

ABOUT THIS FORECAST

 
Point Forecast:
Saint Charles MO
 38.78°N 90.51°W (Elev. 597 ft)
Last Update:
11:37 am CDT Sep 18, 2024
Forecast Valid:
1pm CDT Sep 18, 2024-6pm CDT Sep 24, 2024
 
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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