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

51°F

11°C

Humidity 38%
Wind Speed N 7 mph
Barometer 30.05 in (1017.5 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 13 Mar 8:51 pm CDT
Extended Forecast for

Saint Charles MO

  • Tonight

    Tonight: Partly cloudy, with a low around 38. North wind around 5 mph becoming light and variable.

    Low: 38 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 64. East wind 6 to 11 mph, with gusts as high as 22 mph.

    High: 64 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 55. Southeast wind 10 to 14 mph, with gusts as high as 24 mph.

    Low: 55 °F

    Partly Cloudy

  • Sunday

    Sunday: Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 69. Breezy, with a south wind 17 to 20 mph, with gusts as high as 37 mph. Chance of precipitation is 90%.

    High: 69 °F

    Chance Rain
    then Showers
    and Breezy

  • Sunday Night

    Sunday Night: Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 21. Blustery, with a west wind 21 to 26 mph, with gusts as high as 45 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    Low: 21 °F

    Rain/Snow and
    Blustery

  • Monday

    Monday: A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near 28. Blustery.

    High: 28 °F

    Chance Snow
    and Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around 14. Blustery.

    Low: 14 °F

    Partly Cloudy
    and Blustery
    then Mostly
    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 37.

    High: 37 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of snow before 1am, then a chance of rain and snow. Mostly cloudy, with a low around 31. Chance of precipitation is 30%.

    Low: 31 °F

    Slight Chance
    Snow then
    Chance
    Rain/Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 38. North wind around 5 mph becoming light and variable.
Saturday
Mostly sunny, with a high near 64. East wind 6 to 11 mph, with gusts as high as 22 mph.
Saturday Night
Partly cloudy, with a low around 55. Southeast wind 10 to 14 mph, with gusts as high as 24 mph.
Sunday
Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 69. Breezy, with a south wind 17 to 20 mph, with gusts as high as 37 mph. Chance of precipitation is 90%.
Sunday Night
Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 21. Blustery, with a west wind 21 to 26 mph, with gusts as high as 45 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Monday
A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near 28. Blustery.
Monday Night
Mostly clear, with a low around 14. Blustery.
Tuesday
Sunny, with a high near 37.
Tuesday Night
A slight chance of snow before 1am, then a chance of rain and snow. Mostly cloudy, with a low around 31. Chance of precipitation is 30%.
Wednesday
Mostly sunny, with a high near 64.
Wednesday Night
Mostly clear, with a low around 41.
Thursday
Mostly sunny, with a high near 69.
Thursday Night
Mostly clear, with a low around 46.
Friday
Sunny, with a high near 70.
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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:
8:31 pm CDT Mar 13, 2026
Forecast Valid:
9pm CDT Mar 13, 2026-6pm CDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation