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.

Overcast

30°F

-1°C

Humidity 69%
Wind Speed SE 8 mph
Barometer 30.20 in (1023.8 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 8 Dec 8:51 pm CST
Extended Forecast for

Saint Charles MO

  • Tonight

    Tonight: Partly cloudy early, then becoming cloudy, with a temperature rising to around 34 by 4am. Southeast wind 6 to 8 mph becoming southwest after midnight.

    Low: 29 °F⇑

    Becoming
    Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 52. South wind 8 to 11 mph, with gusts as high as 23 mph.

    High: 52 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 37. South wind 13 to 16 mph becoming west after midnight. Winds could gust as high as 28 mph.

    Low: 37 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Increasing clouds, with a temperature falling to around 36 by 5pm. Breezy, with a northwest wind 19 to 24 mph decreasing to 13 to 18 mph in the afternoon. Winds could gust as high as 41 mph.

    High: 44 °F⇓

    Increasing
    Clouds and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 26. Northwest wind 5 to 9 mph becoming light west after midnight.

    Low: 26 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of snow before noon. Mostly cloudy, with a high near 37.

    High: 37 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 34.

    High: 34 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 14.

    Low: 14 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy early, then becoming cloudy, with a temperature rising to around 34 by 4am. Southeast wind 6 to 8 mph becoming southwest after midnight.
Tuesday
Mostly sunny, with a high near 52. South wind 8 to 11 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly cloudy, with a low around 37. South wind 13 to 16 mph becoming west after midnight. Winds could gust as high as 28 mph.
Wednesday
Increasing clouds, with a temperature falling to around 36 by 5pm. Breezy, with a northwest wind 19 to 24 mph decreasing to 13 to 18 mph in the afternoon. Winds could gust as high as 41 mph.
Wednesday Night
Mostly cloudy, with a low around 26. Northwest wind 5 to 9 mph becoming light west after midnight.
Thursday
A 20 percent chance of snow before noon. Mostly cloudy, with a high near 37.
Thursday Night
Mostly cloudy, with a low around 27.
Friday
Mostly cloudy, with a high near 34.
Friday Night
Mostly cloudy, with a low around 14.
Saturday
Partly sunny, with a high near 23.
Saturday Night
Mostly cloudy, with a low around 14.
Sunday
Mostly sunny, with a high near 28.
Sunday Night
Mostly cloudy, with a low around 21.
Monday
A slight chance of rain and snow. Mostly cloudy, with a high near 36. Chance of precipitation is 20%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Charles MO
 38.78°N 90.51°W (Elev. 597 ft)
Last Update:
8:31 pm CST Dec 8, 2025
Forecast Valid:
9pm CST Dec 8, 2025-6pm CST Dec 15, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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