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.

Mostly Cloudy

16°C

61°F

Humidity 22%
Wind Speed NW 26 km/h
Barometer 1014.2 mb (29.95 in)
Dewpoint -6°C (22°F)
Visibility 16 km
Last update 13 Mar 3:51 pm CDT
Extended Forecast for

Frontenac MO

  • Tonight

    Tonight: Partly cloudy, with a low around 3. Northwest wind 5 to 13 km/h becoming east after midnight.

    Low: 3 °C

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 18. East wind 10 to 18 km/h, with gusts as high as 35 km/h.

    High: 18 °C

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 13. South wind 14 to 23 km/h, with gusts as high as 39 km/h.

    Low: 13 °C

    Mostly Cloudy

  • Sunday

    Sunday: Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 21. South wind 26 to 29 km/h, with gusts as high as 60 km/h. Chance of precipitation is 90%.

    High: 21 °C

    Chance Rain
    then Showers

  • Sunday Night

    Sunday Night: Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around -6. Blustery, with a west wind 29 to 39 km/h, with gusts as high as 70 km/h. Chance of precipitation is 90%. New snow accumulation of 1 to 3 centimeters possible.

    Low: -6 °C

    Rain/Snow and
    Blustery

  • Monday

    Monday: A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near -2. Blustery.

    High: -2 °C

    Chance Snow
    and Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around -10.

    Low: -10 °C

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 3.

    High: 3 °C

    Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of snow before 1am, then a chance of rain and snow. Mostly cloudy, with a low around -1. Chance of precipitation is 30%.

    Low: -1 °C

    Slight Chance
    Snow then
    Chance
    Rain/Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 3. Northwest wind 5 to 13 km/h becoming east after midnight.
Saturday
Mostly sunny, with a high near 18. East wind 10 to 18 km/h, with gusts as high as 35 km/h.
Saturday Night
Mostly cloudy, with a low around 13. South wind 14 to 23 km/h, with gusts as high as 39 km/h.
Sunday
Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 21. South wind 26 to 29 km/h, with gusts as high as 60 km/h. Chance of precipitation is 90%.
Sunday Night
Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around -6. Blustery, with a west wind 29 to 39 km/h, with gusts as high as 70 km/h. Chance of precipitation is 90%. New snow accumulation of 1 to 3 centimeters possible.
Monday
A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near -2. Blustery.
Monday Night
Mostly clear, with a low around -10.
Tuesday
Sunny, with a high near 3.
Tuesday Night
A slight chance of snow before 1am, then a chance of rain and snow. Mostly cloudy, with a low around -1. Chance of precipitation is 30%.
Wednesday
Mostly sunny, with a high near 18.
Wednesday Night
Mostly clear, with a low around 5.
Thursday
Mostly sunny, with a high near 22.
Thursday Night
Mostly clear, with a low around 8.
Friday
Sunny, with a high near 21.
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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 m)
Last Update:
1:21 pm CDT Mar 13, 2026
Forecast Valid:
4pm CDT Mar 13, 2026-6pm CDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

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Chance of Precipitation