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

61°F

16°C

Humidity 50%
Wind Speed SE 9 mph
Barometer 29.89 in (1011.6 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Last update 15 May 3:51 am CDT
Extended Forecast for

Saint Charles MO

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 59. South wind around 11 mph, with gusts as high as 21 mph.

    Low: 59 °F

    Chance
    T-storms

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms, mainly before 8am. Mostly sunny, with a high near 86. South wind 9 to 11 mph, with gusts as high as 22 mph.

    High: 86 °F

    Chance
    T-storms then
    Mostly Sunny

  • Friday Night

    Friday Night: A slight chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 66. South wind around 9 mph. Chance of precipitation is 30%.

    Low: 66 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly before 2pm. Mostly cloudy, then gradually becoming sunny, with a high near 84. South wind around 8 mph. Chance of precipitation is 70%.

    High: 84 °F

    Showers
    Likely then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 65. South wind 6 to 9 mph.

    Low: 65 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 59. South wind around 11 mph, with gusts as high as 21 mph.
Friday
A 40 percent chance of showers and thunderstorms, mainly before 8am. Mostly sunny, with a high near 86. South wind 9 to 11 mph, with gusts as high as 22 mph.
Friday Night
A slight chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 66. South wind around 9 mph. Chance of precipitation is 30%.
Saturday
Showers and thunderstorms likely, mainly before 2pm. Mostly cloudy, then gradually becoming sunny, with a high near 84. South wind around 8 mph. Chance of precipitation is 70%.
Saturday Night
Mostly clear, with a low around 65. South wind 6 to 9 mph.
Sunday
Sunny, with a high near 91.
Sunday Night
Mostly clear, with a low around 71.
Monday
A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 90.
Monday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 87. Chance of precipitation is 70%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
Wednesday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 75.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 56.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 75.
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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:
1:26 am CDT May 15, 2026
Forecast Valid:
3am CDT May 15, 2026-6pm CDT May 21, 2026
 
Forecast Discussion
 
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Additional Resources

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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