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

67°F

19°C

Humidity 100%
Wind Speed Calm
Barometer 30.02 in (1016.1 mb)
Dewpoint 67°F (19°C)
Visibility 6.00 mi
Last update 14 Oct 8:54 pm CDT
Extended Forecast for

Byrnes Mill MO

  • Tonight

    Tonight: Isolated showers between 2am and 3am, then scattered showers and thunderstorms after 3am. Cloudy, with a low around 67. Calm wind. Chance of precipitation is 30%.

    Low: 67 °F

    Cloudy then
    Scattered
    Showers

  • Thursday

    Thursday: Showers and thunderstorms, mainly before 1pm. High near 83. Calm wind becoming south 5 to 7 mph in the afternoon. Chance of precipitation is 80%.

    High: 83 °F

    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am. Mostly cloudy, with a low around 47. West wind 6 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.

    Low: 47 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Mostly cloudy, with a high near 56. Northwest wind around 14 mph, with gusts as high as 28 mph.

    High: 56 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 40. Northwest wind 5 to 11 mph, with gusts as high as 22 mph.

    Low: 40 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 37.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Tonight
Isolated showers between 2am and 3am, then scattered showers and thunderstorms after 3am. Cloudy, with a low around 67. Calm wind. Chance of precipitation is 30%.
Thursday
Showers and thunderstorms, mainly before 1pm. High near 83. Calm wind becoming south 5 to 7 mph in the afternoon. Chance of precipitation is 80%.
Thursday Night
A chance of showers and thunderstorms before 1am, then a chance of showers between 1am and 4am. Mostly cloudy, with a low around 47. West wind 6 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.
Friday
Mostly cloudy, with a high near 56. Northwest wind around 14 mph, with gusts as high as 28 mph.
Friday Night
Mostly cloudy, with a low around 40. Northwest wind 5 to 11 mph, with gusts as high as 22 mph.
Saturday
Sunny, with a high near 61.
Saturday Night
Clear, with a low around 37.
Sunday
Sunny, with a high near 68.
Sunday Night
Mostly clear, with a low around 40.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 50.
Wednesday
Sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Byrnes Mill MO
 38.43°N 90.55°W (Elev. 597 ft)
Last Update:
8:25 pm CDT Oct 14, 2026
Forecast Valid:
9pm CDT Oct 14, 2026-6pm CDT Oct 21, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation