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

81°F

27°C

Humidity 67%
Wind Speed N 8 mph
Barometer 30.05 in (1016.3 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 6 Jul 11:51 am CDT
Extended Forecast for

Saint Charles MO

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 85. North wind 5 to 7 mph.

    High: 85 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 69. North wind around 6 mph becoming calm in the evening.

    Low: 69 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 86. Northeast wind 3 to 6 mph.

    High: 86 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 69. Northeast wind around 5 mph becoming calm in the evening.

    Low: 69 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 89. Calm wind.

    High: 89 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 93.

    High: 93 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely, mainly after 1am. Partly cloudy, with a low around 74. Chance of precipitation is 60%.

    Low: 74 °F

    Slight Chance
    T-storms then
    T-storms
    Likely

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.

    High: 89 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Partly sunny, with a high near 85. North wind 5 to 7 mph.
Tonight
Partly cloudy, with a low around 69. North wind around 6 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 86. Northeast wind 3 to 6 mph.
Tuesday Night
Mostly clear, with a low around 69. Northeast wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 89. Calm wind.
Wednesday Night
Mostly clear, with a low around 73.
Thursday
Mostly sunny, with a high near 93.
Thursday Night
Showers and thunderstorms likely, mainly after 1am. Partly cloudy, with a low around 74. Chance of precipitation is 60%.
Friday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 72. Chance of precipitation is 60%.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Charles MO
 38.78°N 90.54°W (Elev. 515 ft)
Last Update:
11:56 am CDT Jul 6, 2026
Forecast Valid:
12pm CDT Jul 6, 2026-6pm CDT Jul 12, 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