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

Hazardous Weather Conditions

Current conditions at

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

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair and Breezy

91°F

33°C

Humidity 47%
Wind Speed SW 21 G 37 mph
Barometer 29.43 in (995.7 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 17 Jun 3:54 pm CDT
Extended Forecast for

Byrnes Mill MO

Tornado Watch until June 17, 10:00pm
Wind Advisory until June 17, 08:00pm
Click here for hazard details and duration
Tornado Watch
Wind Advisory
  •  
    Tornado Watch until June 17, 10:00pm
    Wind Advisory until June 17, 08:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • This Afternoon

    High: 91 °F

    Sunny

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 11pm. Some of the storms could be severe. Cloudy, then gradually becoming partly cloudy, with a low around 68. Southwest wind 8 to 13 mph becoming light west after midnight. Winds could gust as high as 31 mph. Chance of precipitation is 60%.

    Low: 68 °F

    Severe
    Thunderstorms
    then Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers, mainly after 5pm. Increasing clouds, with a high near 82. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 82 °F

    Sunny then
    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 59. Light north wind.

    Low: 59 °F

    Decreasing
    Clouds

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 84. Calm wind.

    High: 84 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 85. Chance of precipitation is 20%.

    High: 85 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.

    Low: 67 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 91. Southwest wind around 16 mph, with gusts as high as 37 mph.
Tonight
Showers and thunderstorms likely, mainly before 11pm. Some of the storms could be severe. Cloudy, then gradually becoming partly cloudy, with a low around 68. Southwest wind 8 to 13 mph becoming light west after midnight. Winds could gust as high as 31 mph. Chance of precipitation is 60%.
Thursday
A 30 percent chance of showers, mainly after 5pm. Increasing clouds, with a high near 82. Calm wind becoming northwest around 6 mph in the afternoon.
Thursday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 59. Light north wind.
Juneteenth
Mostly sunny, with a high near 84. Calm wind.
Friday Night
Partly cloudy, with a low around 64.
Saturday
A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 85. Chance of precipitation is 20%.
Saturday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Sunday
Showers and possibly a thunderstorm. High near 84. Chance of precipitation is 80%.
Sunday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 65. Chance of precipitation is 80%.
Monday
A 20 percent chance of showers. Partly sunny, with a high near 80.
Monday Night
Partly cloudy, with a low around 61.
Tuesday
Mostly sunny, with a high near 82.
Tuesday Night
Partly cloudy, with a low around 62.
Wednesday
Mostly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Byrnes Mill MO
 38.45°N 90.58°W (Elev. 525 ft)
Last Update:
2:21 pm CDT Jun 17, 2026
Forecast Valid:
4pm CDT Jun 17, 2026-6pm CDT Jun 24, 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