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

31°F

-1°C

Humidity 31%
Wind Speed W 10 G 18 mph
Barometer 30.26 in (1026.1 mb)
Dewpoint 4°F (-16°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 17 Mar 2:51 pm CDT
Extended Forecast for

Saint Charles MO

  • Tonight

    Tonight: A 40 percent chance of snow, mainly before 1am. Mostly cloudy, with a low around 32. Southeast wind 6 to 13 mph, with gusts as high as 26 mph.

    Low: 32 °F

    Chance Snow

  • Wednesday

    Wednesday: Partly sunny, then gradually becoming sunny, with a high near 63. South wind 7 to 10 mph becoming west in the afternoon.

    High: 63 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 46. Light and variable wind becoming south around 5 mph after midnight.

    Low: 46 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 73. South wind 5 to 7 mph becoming northwest in the afternoon.

    High: 73 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 44. North wind around 6 mph becoming calm after midnight.

    Low: 44 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 51.

    Low: 51 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Tonight
A 40 percent chance of snow, mainly before 1am. Mostly cloudy, with a low around 32. Southeast wind 6 to 13 mph, with gusts as high as 26 mph.
Wednesday
Partly sunny, then gradually becoming sunny, with a high near 63. South wind 7 to 10 mph becoming west in the afternoon.
Wednesday Night
Mostly cloudy, with a low around 46. Light and variable wind becoming south around 5 mph after midnight.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 73. South wind 5 to 7 mph becoming northwest in the afternoon.
Thursday Night
Mostly clear, with a low around 44. North wind around 6 mph becoming calm after midnight.
Friday
Sunny, with a high near 73.
Friday Night
Partly cloudy, with a low around 51.
Saturday
Sunny, with a high near 81.
Saturday Night
Mostly clear, with a low around 57.
Sunday
Mostly sunny, with a high near 79.
Sunday Night
Partly cloudy, with a low around 41.
Monday
Mostly sunny, with a high near 55.
Monday Night
Mostly cloudy, with a low around 38.
Tuesday
Mostly sunny, with a high near 58.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Charles MO
 38.78°N 90.51°W (Elev. 597 ft)
Last Update:
2:56 pm CDT Mar 17, 2026
Forecast Valid:
3pm CDT Mar 17, 2026-6pm CDT Mar 24, 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