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.

Mostly Cloudy

81°F

27°C

Humidity 72%
Wind Speed W 10 mph
Barometer 29.89 in (1011.6 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 15 Oct 3:54 pm CDT
Extended Forecast for

Byrnes Mill MO

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 80. Southwest wind around 7 mph.

    High: 80 °F

    Chance
    Showers

  • Tonight

    Tonight: Showers and thunderstorms likely before 2am, then a slight chance of showers between 2am and 4am. Increasing clouds, with a low around 43. Northwest wind 7 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.

    Low: 43 °F

    Showers
    Likely then
    Chance
    Showers

  • Friday

    Friday: Partly sunny, with a high near 56. Northwest wind 11 to 14 mph, with gusts as high as 25 mph.

    High: 56 °F

    Partly Sunny

  • Friday Night

    Friday Night: Cloudy, then gradually becoming partly cloudy, with a low around 37. Northwest wind 6 to 11 mph becoming light north after midnight. Winds could gust as high as 24 mph.

    Low: 37 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 59. Light northeast wind.

    High: 59 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 34.

    Low: 34 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 80. Southwest wind around 7 mph.
Tonight
Showers and thunderstorms likely before 2am, then a slight chance of showers between 2am and 4am. Increasing clouds, with a low around 43. Northwest wind 7 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.
Friday
Partly sunny, with a high near 56. Northwest wind 11 to 14 mph, with gusts as high as 25 mph.
Friday Night
Cloudy, then gradually becoming partly cloudy, with a low around 37. Northwest wind 6 to 11 mph becoming light north after midnight. Winds could gust as high as 24 mph.
Saturday
Sunny, with a high near 59. Light northeast wind.
Saturday Night
Clear, with a low around 34.
Sunday
Sunny, with a high near 66.
Sunday Night
Mostly clear, with a low around 37.
Monday
Mostly sunny, with a high near 71.
Monday Night
Partly cloudy, with a low around 41.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 45.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Byrnes Mill MO
 38.43°N 90.58°W (Elev. 495 ft)
Last Update:
2:26 pm CDT Oct 15, 2026
Forecast Valid:
4pm CDT Oct 15, 2026-6pm CDT Oct 22, 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