National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Mostly Cloudy

86°F

30°C

Humidity 55%
Wind Speed SE 12 mph
Barometer 30.15 in (1019.7 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 6 Aug 7:51 pm CDT
Extended Forecast for

Saint Charles MO

  • Tonight

    Tonight: Mostly clear, with a low around 74. Southeast wind 3 to 5 mph.

    Low: 74 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 100. Calm wind becoming southwest around 6 mph in the morning.

    High: 93 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 74. South wind around 6 mph.

    Low: 74 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 94. South wind 6 to 9 mph.

    High: 94 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 76. South wind 6 to 8 mph.

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 76.

    Low: 76 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75.

    Low: 75 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 74. Southeast wind 3 to 5 mph.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 100. Calm wind becoming southwest around 6 mph in the morning.
Thursday Night
Partly cloudy, with a low around 74. South wind around 6 mph.
Friday
Sunny, with a high near 94. South wind 6 to 9 mph.
Friday Night
Mostly clear, with a low around 76. South wind 6 to 8 mph.
Saturday
Sunny, with a high near 94.
Saturday Night
Partly cloudy, with a low around 76.
Sunday
Mostly sunny, with a high near 91.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75.
Monday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 90. Chance of precipitation is 20%.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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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:
4:16 pm CDT Aug 6, 2025
Forecast Valid:
8pm CDT Aug 6, 2025-6pm CDT Aug 13, 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