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

59°F

15°C

Humidity 78%
Wind Speed W 15 G 21 mph
Barometer 29.87 in (1010.6 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 21 Apr 3:51 am CDT
Extended Forecast for

Saint Charles MO

  • Today

    Today: Mostly cloudy through mid morning, then gradual clearing, with a high near 68. West wind 8 to 13 mph, with gusts as high as 22 mph.

    High: 68 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 49. West wind around 5 mph becoming calm in the evening.

    Low: 49 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 79. South wind 3 to 8 mph.

    High: 79 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 55. Southeast wind around 6 mph becoming calm after midnight.

    Low: 55 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 80. Calm wind becoming southeast around 6 mph in the morning.

    High: 80 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 59. Chance of precipitation is 30%.

    Low: 59 °F

    Chance
    Showers

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 81.

    High: 81 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.

    Low: 62 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 75. Chance of precipitation is 80%.

    High: 75 °F

    Showers

Detailed Forecast

Today
Mostly cloudy through mid morning, then gradual clearing, with a high near 68. West wind 8 to 13 mph, with gusts as high as 22 mph.
Tonight
Mostly clear, with a low around 49. West wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 79. South wind 3 to 8 mph.
Tuesday Night
Partly cloudy, with a low around 55. Southeast wind around 6 mph becoming calm after midnight.
Wednesday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 80. Calm wind becoming southeast around 6 mph in the morning.
Wednesday Night
A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 59. Chance of precipitation is 30%.
Thursday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 81.
Thursday Night
A chance of showers and thunderstorms, then showers likely after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
Friday
Showers and possibly a thunderstorm. High near 75. Chance of precipitation is 80%.
Friday Night
A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 53.
Saturday
Mostly sunny, with a high near 69.
Saturday Night
Partly cloudy, with a low around 51.
Sunday
A 30 percent chance of showers. Partly sunny, with a high near 73.
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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:
2:52 am CDT Apr 21, 2025
Forecast Valid:
4am CDT Apr 21, 2025-6pm CDT Apr 27, 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