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

32°F

0°C

Humidity 79%
Wind Speed N 13 mph
Barometer 30.26 in (1025.7 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 7 Dec 7:51 pm CST
Extended Forecast for

Saint Charles MO

  • Tonight

    Tonight: Cloudy during the early evening, then gradual clearing, with a low around 21. North wind 6 to 11 mph, with gusts as high as 21 mph.

    Low: 21 °F

    Gradual
    Clearing

  • Monday

    Monday: Mostly sunny, with a high near 33. North wind around 5 mph becoming calm in the morning.

    High: 33 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 27. Southeast wind 5 to 10 mph becoming southwest after midnight.

    Low: 27 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 51. Southwest wind around 10 mph, with gusts as high as 20 mph.

    High: 51 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40. South wind 10 to 15 mph becoming west after midnight. Winds could gust as high as 25 mph.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 46.

    High: 46 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday

    Thursday: A 30 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 34.

    High: 34 °F

    Chance Snow

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 19.

    Low: 19 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Cloudy during the early evening, then gradual clearing, with a low around 21. North wind 6 to 11 mph, with gusts as high as 21 mph.
Monday
Mostly sunny, with a high near 33. North wind around 5 mph becoming calm in the morning.
Monday Night
Partly cloudy, with a low around 27. Southeast wind 5 to 10 mph becoming southwest after midnight.
Tuesday
Mostly sunny, with a high near 51. Southwest wind around 10 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly cloudy, with a low around 40. South wind 10 to 15 mph becoming west after midnight. Winds could gust as high as 25 mph.
Wednesday
Partly sunny, with a high near 46.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 27.
Thursday
A 30 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 34.
Thursday Night
Mostly cloudy, with a low around 19.
Friday
Partly sunny, with a high near 26.
Friday Night
Mostly cloudy, with a low around 7.
Saturday
Partly sunny and cold, with a high near 20.
Saturday Night
Mostly cloudy, with a low around 9.
Sunday
Mostly sunny, with a high near 25.
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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:
6:51 pm CST Dec 7, 2025
Forecast Valid:
8pm CST Dec 7, 2025-6pm CST Dec 14, 2025
 
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