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 61%
Wind Speed SW 3 mph
Barometer 29.99 in (1014.2 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 15 Jul 12:51 pm CDT
Extended Forecast for

Saint Charles MO

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 88. South wind around 6 mph.

    High: 88 °F

    Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 73. South wind 3 to 5 mph.

    Low: 73 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms after 2pm. Sunny, with a high near 94. Heat index values as high as 103. Southwest wind 5 to 10 mph. Chance of precipitation is 20%.

    High: 94 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 75. Southwest wind around 7 mph.

    Low: 75 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. Northwest wind around 7 mph.

    High: 89 °F

    Partly Sunny
    then Chance
    T-storms

  • Thursday Night

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

    Low: 71 °F

    Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 86.

    High: 86 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73.

    Low: 73 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92.

    High: 92 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 88. South wind around 6 mph.
Tonight
Partly cloudy, with a low around 73. South wind 3 to 5 mph.
Wednesday
A slight chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms after 2pm. Sunny, with a high near 94. Heat index values as high as 103. Southwest wind 5 to 10 mph. Chance of precipitation is 20%.
Wednesday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 75. Southwest wind around 7 mph.
Thursday
A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. Northwest wind around 7 mph.
Thursday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 71.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 86.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73.
Saturday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
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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:
12:21 pm CDT Jul 15, 2025
Forecast Valid:
1pm CDT Jul 15, 2025-6pm CDT Jul 21, 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