Showers and Storms continue across the East; Heat, Critical Fire Weather, Drought, and Poor Air Quality continues in the West

A series of fronts will focus locally heavy showers and storms across portions of the central and eastern U.S. through the end of the workweek. Dangerous to extreme heat continues across the Southwest U.S., eventually spreading eastward over the weekend into early next week. Elevated fire weather conditions continue across the Great Basin, with degraded air quality lingering across the Northwest. Read More >

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Partly Cloudy

86°F

30°C

Humidity 48%
Wind Speed SE 5 mph
Barometer 30.00 in (1014.8 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 4 Aug 4:51 pm CDT
Extended Forecast for

Saint Charles MO

  • Tonight

    Tonight: Mostly clear, with a low around 71. South wind 3 to 6 mph.

    Low: 71 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm.  Increasing clouds, with a high near 90. Light south wind increasing to 5 to 9 mph in the morning.

    High: 90 °F

    Sunny then
    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely, mainly after 4am.  Cloudy, then gradually becoming partly cloudy, with a low around 72. East wind 5 to 8 mph becoming light and variable  after midnight.  Chance of precipitation is 60%.

    Low: 72 °F

    T-storms
    Likely

  • Thursday

    Thursday: Showers and thunderstorms, mainly before 10am.  High near 84. Northeast wind around 5 mph becoming light and variable  in the afternoon.  Chance of precipitation is 80%.

    High: 84 °F

    T-storms then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 71. Light southeast wind.

    Low: 71 °F

    Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 10am, then a chance of showers and thunderstorms after 10am.  Partly sunny, with a high near 86. Chance of precipitation is 30%.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am.  Partly cloudy, with a low around 71.

    Low: 71 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 71. South wind 3 to 6 mph.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Increasing clouds, with a high near 90. Light south wind increasing to 5 to 9 mph in the morning.
Wednesday Night
Showers and thunderstorms likely, mainly after 4am. Cloudy, then gradually becoming partly cloudy, with a low around 72. East wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 60%.
Thursday
Showers and thunderstorms, mainly before 10am. High near 84. Northeast wind around 5 mph becoming light and variable in the afternoon. Chance of precipitation is 80%.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Light southeast wind.
Friday
A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 10am, then a chance of showers and thunderstorms after 10am. Partly sunny, with a high near 86. Chance of precipitation is 30%.
Friday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 71.
Saturday
Mostly sunny, with a high near 89.
Saturday Night
Mostly clear, with a low around 74.
Sunday
Mostly sunny, with a high near 91.
Sunday Night
Mostly clear, with a low around 76.
Monday
Sunny, with a high near 94.
Monday Night
Mostly clear, with a low around 77.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Charles MO
 38.78°N 90.51°W (Elev. 597 ft)
5:21 pm CDT Aug 4, 2026
5pm CDT Aug 4, 2026-6pm CDT Aug 11, 2026
 
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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