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

86°F

30°C

Humidity 48%
Wind Speed Vrbl 5 mph
Barometer 29.98 in (1014.5 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 30 Jul 5:54 pm CDT
Extended Forecast for

Byrnes Mill MO

  • Tonight

    Tonight: Mostly cloudy, with a low around 68. Light east wind.

    Low: 68 °F

    Mostly Cloudy

  • Friday

    Friday: Showers and thunderstorms likely, mainly before 1pm. Mostly cloudy, with a high near 85. South wind 3 to 7 mph. Chance of precipitation is 60%.

    High: 85 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms before 4am, then a slight chance of showers. Low around 68. South wind 5 to 7 mph becoming west after midnight. Chance of precipitation is 80%.

    Low: 68 °F

    Showers

  • Saturday

    Saturday: Showers likely, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 77. West wind 7 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

    High: 77 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. North wind 7 to 9 mph, with gusts as high as 22 mph. Chance of precipitation is 40%.

    Low: 64 °F

    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 40%.

    High: 80 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 63.

    Low: 63 °F

    Slight Chance
    Showers

  • Monday

    Monday: A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 83.

    High: 83 °F

    Sunny then
    Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 68. Light east wind.
Friday
Showers and thunderstorms likely, mainly before 1pm. Mostly cloudy, with a high near 85. South wind 3 to 7 mph. Chance of precipitation is 60%.
Friday Night
Showers and thunderstorms before 4am, then a slight chance of showers. Low around 68. South wind 5 to 7 mph becoming west after midnight. Chance of precipitation is 80%.
Saturday
Showers likely, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 77. West wind 7 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. North wind 7 to 9 mph, with gusts as high as 22 mph. Chance of precipitation is 40%.
Sunday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 40%.
Sunday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 63.
Monday
A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 83.
Monday Night
Mostly clear, with a low around 65.
Tuesday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 87.
Tuesday Night
Mostly clear, with a low around 68.
Wednesday
Sunny, with a high near 90.
Wednesday Night
Mostly clear, with a low around 70.
Thursday
Sunny, with a high near 92.
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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:
5:31 pm CDT Jul 30, 2026
Forecast Valid:
6pm CDT Jul 30, 2026-6pm CDT Aug 6, 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