National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Rainfall and Flooding in the Southwest and Along the East Coast

A multi-day heavy rainfall event is set to begin across New Mexico into west Texas Tuesday through Wednesday. Flash flooding and debris flows in the vicinity of burn scars will also be possible. A strong coastal low will develop offshore of the Mid-Atlantic coast midweek, bringing heavy rainfall, strong winds and coastal flooding to much of the East Coast through Friday. Read More >

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Overcast

69°F

21°C

Humidity 81%
Wind Speed NE 7 mph
Barometer 30.04 in (1016.4 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 21 Sep 7:51 pm CDT
Extended Forecast for

Frontenac MO

  • Tonight

    Tonight: Cloudy, with a low around 62. Northeast wind around 6 mph.

    Low: 62 °F

    Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 73. Northeast wind 6 to 8 mph.

    High: 73 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 57. North wind 5 to 7 mph.

    Low: 57 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75. North wind 6 to 8 mph.

    High: 75 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 57. Northeast wind around 6 mph becoming calm after midnight.

    Low: 57 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 77.

    High: 77 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 58.

    Low: 58 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Cloudy, with a low around 62. Northeast wind around 6 mph.
Tuesday
Mostly cloudy, with a high near 73. Northeast wind 6 to 8 mph.
Tuesday Night
Mostly cloudy, with a low around 57. North wind 5 to 7 mph.
Wednesday
Mostly sunny, with a high near 75. North wind 6 to 8 mph.
Wednesday Night
Partly cloudy, with a low around 57. Northeast wind around 6 mph becoming calm after midnight.
Thursday
Mostly sunny, with a high near 76.
Thursday Night
Partly cloudy, with a low around 59.
Friday
Partly sunny, with a high near 77.
Friday Night
Mostly cloudy, with a low around 58.
Saturday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 76.
Saturday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 60.
Sunday
A 20 percent chance of showers. Partly sunny, with a high near 80.
Sunday Night
A 20 percent chance of showers. Partly cloudy, with a low around 61.
Monday
Mostly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Frontenac MO
 38.62°N 90.4°W (Elev. 597 ft)
Last Update:
7:46 pm CDT Sep 21, 2026
Forecast Valid:
7pm CDT Sep 21, 2026-6pm CDT Sep 28, 2026
 
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