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

St. Louis, Spirit Of St. Louis Airport (KSUS)

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fog/Mist

34°F

1°C

Humidity 100%
Wind Speed Calm
Barometer 30.26 in (1024.6 mb)
Dewpoint 34°F (1°C)
Visibility 0.75 mi
Last update 6 Nov 12:54 am CST
Extended Forecast for

Byrnes Mill MO

  • Overnight

    Overnight: Clear, with a low around 39. Light and variable wind.

    Low: 39 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 66. Light east wind becoming southeast 5 to 10 mph in the morning. Winds could gust as high as 21 mph.

    High: 66 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 54. Southeast wind 6 to 9 mph becoming southwest after midnight. Winds could gust as high as 23 mph.

    Low: 54 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy through mid morning, then gradual clearing, with a high near 72. West wind 6 to 8 mph.

    High: 72 °F

    Becoming
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 43. West wind around 5 mph becoming calm in the evening.

    Low: 43 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of rain after noon. Partly sunny, with a high near 69.

    High: 69 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 22.

    Low: 22 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 39. Light and variable wind.
Thursday
Sunny, with a high near 66. Light east wind becoming southeast 5 to 10 mph in the morning. Winds could gust as high as 21 mph.
Thursday Night
Mostly cloudy, with a low around 54. Southeast wind 6 to 9 mph becoming southwest after midnight. Winds could gust as high as 23 mph.
Friday
Mostly cloudy through mid morning, then gradual clearing, with a high near 72. West wind 6 to 8 mph.
Friday Night
Mostly clear, with a low around 43. West wind around 5 mph becoming calm in the evening.
Saturday
A 20 percent chance of rain after noon. Partly sunny, with a high near 69.
Saturday Night
Mostly cloudy, with a low around 32.
Sunday
Mostly sunny, with a high near 42.
Sunday Night
Mostly clear, with a low around 22.
Monday
Sunny, with a high near 43.
Monday Night
Mostly clear, with a low around 26.
Veterans Day
Mostly sunny, with a high near 60.
Tuesday Night
Partly cloudy, with a low around 40.
Wednesday
Sunny, with a high near 64.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Byrnes Mill MO
 38.43°N 90.58°W (Elev. 495 ft)
Last Update:
1:06 am CST Nov 6, 2025
Forecast Valid:
1am CST Nov 6, 2025-6pm CST Nov 12, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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