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.

Fair

33°F

1°C

Humidity 89%
Wind Speed Calm
Barometer 29.89 in (1012.4 mb)
Dewpoint 30°F (-1°C)
Visibility 9.00 mi
Last update 7 Jan 12:54 am CST
Extended Forecast for

Byrnes Mill MO

  • Overnight

    Overnight: Clear, with a steady temperature around 41. Calm wind.

    Low: 41 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 66. Calm wind becoming south around 6 mph in the afternoon.

    High: 66 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 47. South wind around 6 mph.

    Low: 47 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Rain. High near 65. South wind 6 to 11 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.

    High: 65 °F

    Rain

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 9pm, then a chance of rain, mainly between 9pm and midnight. Mostly cloudy, with a low around 48. South wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 50%.

    Low: 48 °F

    Chance
    Showers then
    Slight Chance
    Rain

  • Friday

    Friday: Mostly cloudy, with a high near 57.

    High: 57 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 30 percent chance of rain. Mostly cloudy, with a low around 39.

    Low: 39 °F

    Chance Rain

  • Saturday

    Saturday: Partly sunny, with a high near 47.

    High: 47 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

Detailed Forecast

Overnight
Clear, with a steady temperature around 41. Calm wind.
Wednesday
Sunny, with a high near 66. Calm wind becoming south around 6 mph in the afternoon.
Wednesday Night
Increasing clouds, with a low around 47. South wind around 6 mph.
Thursday
Rain. High near 65. South wind 6 to 11 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.
Thursday Night
A chance of showers and thunderstorms before 9pm, then a chance of rain, mainly between 9pm and midnight. Mostly cloudy, with a low around 48. South wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 50%.
Friday
Mostly cloudy, with a high near 57.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 39.
Saturday
Partly sunny, with a high near 47.
Saturday Night
Partly cloudy, with a low around 25.
Sunday
Mostly sunny, with a high near 39.
Sunday Night
Mostly clear, with a low around 26.
Monday
Sunny, with a high near 51.
Monday Night
Partly cloudy, with a low around 31.
Tuesday
Mostly sunny, with a high near 50.
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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:
12:56 am CST Jan 7, 2026
Forecast Valid:
1am CST Jan 7, 2026-6pm CST Jan 13, 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