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

48°F

9°C

Humidity 68%
Wind Speed NW 9 mph
Barometer 30.10 in (1019.1 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 9 Jan 11:51 am CST
Extended Forecast for

Saint Charles MO

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 50. Northwest wind 5 to 9 mph becoming northeast.

    High: 50 °F

    Partly Sunny

  • Tonight

    Tonight: A 40 percent chance of rain, mainly after 3am. Mostly cloudy, with a low around 36. Calm wind becoming northwest 5 to 7 mph after midnight.

    Low: 36 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday

    Saturday: A 20 percent chance of rain before 7am. Cloudy through mid morning, then gradual clearing, with a high near 46. Northwest wind 10 to 16 mph, with gusts as high as 25 mph.

    High: 46 °F

    Slight Chance
    Rain then
    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25. Northwest wind 11 to 14 mph, with gusts as high as 30 mph.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 37. Northwest wind 6 to 14 mph, with gusts as high as 24 mph.

    High: 37 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 27.

    Low: 27 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 56.

    High: 56 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 50. Northwest wind 5 to 9 mph becoming northeast.
Tonight
A 40 percent chance of rain, mainly after 3am. Mostly cloudy, with a low around 36. Calm wind becoming northwest 5 to 7 mph after midnight.
Saturday
A 20 percent chance of rain before 7am. Cloudy through mid morning, then gradual clearing, with a high near 46. Northwest wind 10 to 16 mph, with gusts as high as 25 mph.
Saturday Night
Partly cloudy, with a low around 25. Northwest wind 11 to 14 mph, with gusts as high as 30 mph.
Sunday
Sunny, with a high near 37. Northwest wind 6 to 14 mph, with gusts as high as 24 mph.
Sunday Night
Mostly clear, with a low around 27.
Monday
Sunny, with a high near 52.
Monday Night
Partly cloudy, with a low around 39.
Tuesday
Partly sunny, with a high near 56.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
A 20 percent chance of rain. Mostly cloudy, with a high near 43.
Wednesday Night
Mostly cloudy, with a low around 25.
Thursday
Mostly sunny, with a high near 39.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Charles MO
 38.81°N 90.54°W (Elev. 512 ft)
Last Update:
11:17 am CST Jan 9, 2026
Forecast Valid:
12pm CST Jan 9, 2026-6pm CST Jan 15, 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