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.

Fair

86°F

30°C

Humidity 43%
Wind Speed SW 14 mph
Barometer 29.96 in (1013.3 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 12 Oct 11:51 am CDT
Extended Forecast for

Saint Charles MO

  • Columbus Day

    Columbus Day: Increasing clouds, with a high near 94. Southwest wind 11 to 13 mph, with gusts as high as 22 mph.

    High: 94 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 70. South wind 7 to 9 mph.

    Low: 70 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 94. Southwest wind 6 to 8 mph.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 71. South wind 5 to 8 mph. Chance of precipitation is 60%.

    Low: 71 °F

    Mostly Clear
    then Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 80. Light and variable wind. Chance of precipitation is 100%.

    High: 80 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 66. Chance of precipitation is 70%.

    Low: 66 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 81. Chance of precipitation is 90%.

    High: 81 °F

    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 53.

    Low: 53 °F

    Chance
    Showers

  • Friday

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

    High: 63 °F

    Mostly Sunny
    and Breezy

Detailed Forecast

Columbus Day
Increasing clouds, with a high near 94. Southwest wind 11 to 13 mph, with gusts as high as 22 mph.
Tonight
Mostly cloudy, then gradually becoming clear, with a low around 70. South wind 7 to 9 mph.
Tuesday
Sunny, with a high near 94. Southwest wind 6 to 8 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 71. South wind 5 to 8 mph. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm. High near 80. Light and variable wind. Chance of precipitation is 100%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 66. Chance of precipitation is 70%.
Thursday
Showers and possibly a thunderstorm. High near 81. Chance of precipitation is 90%.
Thursday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 53.
Friday
Mostly sunny, with a high near 63. Breezy.
Friday Night
Mostly clear, with a low around 41.
Saturday
Sunny, with a high near 61.
Saturday Night
Clear, with a low around 40.
Sunday
Sunny, with a high near 69.
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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:
11:31 am CDT Oct 12, 2026
Forecast Valid:
12pm CDT Oct 12, 2026-6pm CDT Oct 18, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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