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

64°F

18°C

Humidity 90%
Wind Speed W 5 mph
Barometer 30.02 in (1016.0 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 19 Jun 6:51 am CDT
Extended Forecast for

Saint Charles MO

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 83. Light northwest wind.

    High: 83 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers before 8am. Mostly sunny, with a high near 86. Light southwest wind.

    High: 86 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. Southeast wind 3 to 6 mph.

    Low: 68 °F

    Partly Cloudy
    then Chance
    T-storms

  • Sunday

    Sunday: Showers and thunderstorms. High near 84. Southeast wind 8 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%.

    High: 84 °F

    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms. Low around 65. Chance of precipitation is 80%.

    Low: 65 °F

    T-storms

  • Monday

    Monday: Partly sunny, with a high near 78.

    High: 78 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

Detailed Forecast

Juneteenth
Mostly sunny, with a high near 83. Light northwest wind.
Tonight
Mostly cloudy, with a low around 65. Calm wind.
Saturday
A 20 percent chance of showers before 8am. Mostly sunny, with a high near 86. Light southwest wind.
Saturday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. Southeast wind 3 to 6 mph.
Sunday
Showers and thunderstorms. High near 84. Southeast wind 8 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%.
Sunday Night
Showers and thunderstorms. Low around 65. Chance of precipitation is 80%.
Monday
Partly sunny, with a high near 78.
Monday Night
Partly cloudy, with a low around 61.
Tuesday
Mostly sunny, with a high near 80.
Tuesday Night
Partly cloudy, with a low around 63.
Wednesday
Mostly sunny, with a high near 83.
Wednesday Night
Mostly clear, with a low around 64.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
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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:
5:06 am CDT Jun 19, 2026
Forecast Valid:
7am CDT Jun 19, 2026-6pm CDT Jun 25, 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