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.

Partly Cloudy

59°F

15°C

Humidity 46%
Wind Speed S 10 mph
Barometer 29.96 in (1014.5 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 16 Feb 6:51 pm CST
Extended Forecast for

Frontenac MO

  • Tonight

    Tonight: Mostly cloudy, with a low around 44. South wind 6 to 8 mph.

    Low: 44 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 67. South wind 6 to 15 mph, with gusts as high as 29 mph.

    High: 67 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms between 3am and 5am. Cloudy during the early evening, then gradual clearing, with a low around 57. Southwest wind 14 to 18 mph, with gusts as high as 34 mph. Chance of precipitation is 20%.

    Low: 57 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 73. West wind 6 to 14 mph, with gusts as high as 24 mph.

    High: 73 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 49. Southwest wind around 5 mph becoming light and variable.

    Low: 49 °F

    Mostly Clear

  • Thursday

    Thursday: A 40 percent chance of showers. Mostly sunny, with a high near 74.

    High: 74 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 38.

    Low: 38 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 44. South wind 6 to 8 mph.
Tuesday
Mostly cloudy, with a high near 67. South wind 6 to 15 mph, with gusts as high as 29 mph.
Tuesday Night
A slight chance of showers and thunderstorms between 3am and 5am. Cloudy during the early evening, then gradual clearing, with a low around 57. Southwest wind 14 to 18 mph, with gusts as high as 34 mph. Chance of precipitation is 20%.
Wednesday
Sunny, with a high near 73. West wind 6 to 14 mph, with gusts as high as 24 mph.
Wednesday Night
Mostly clear, with a low around 49. Southwest wind around 5 mph becoming light and variable.
Thursday
A 40 percent chance of showers. Mostly sunny, with a high near 74.
Thursday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 38.
Friday
Mostly sunny, with a high near 52.
Friday Night
Partly cloudy, with a low around 33.
Saturday
Mostly sunny, with a high near 49.
Saturday Night
A 20 percent chance of rain. Partly cloudy, with a low around 29.
Sunday
Sunny, with a high near 43.
Sunday Night
Mostly clear, with a low around 22.
Monday
Mostly sunny, with a high near 43.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Frontenac MO
 38.62°N 90.4°W (Elev. 597 ft)
Last Update:
5:01 pm CST Feb 16, 2026
Forecast Valid:
7pm CST Feb 16, 2026-6pm CST Feb 23, 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