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.

Mostly Cloudy

76°F

24°C

Humidity 88%
Wind Speed SE 6 mph
Barometer 29.88 in (1011.2 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 26 Jun 7:54 pm CDT
Extended Forecast for

Byrnes Mill MO

Flood Watch June 26, 08:28pm until June 26, 10:00pm
Click here for hazard details and duration
...
  •  
    Flood Watch June 26, 08:28pm until June 26, 10:00pm

    NOW until 10:00pm Fri

    Flood Watch

  • Tonight

    Low: 68 °F

    Showers
    Likely then
    Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms, mainly after 2pm. Mostly cloudy, with a high near 84. West wind 3 to 6 mph.

    High: 84 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 72. South wind 3 to 5 mph.

    Low: 72 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 93. Heat index values as high as 109. South wind 3 to 6 mph.

    High: 93 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75. South wind around 6 mph becoming calm after midnight.

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

Detailed Forecast

Tonight
Showers likely and possibly a thunderstorm before 9pm, then a chance of showers and thunderstorms, mainly between 9pm and 5am. Mostly cloudy, with a low around 68. South wind 3 to 5 mph. Chance of precipitation is 60%.
Saturday
A 40 percent chance of showers and thunderstorms, mainly after 2pm. Mostly cloudy, with a high near 84. West wind 3 to 6 mph.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 72. South wind 3 to 5 mph.
Sunday
Sunny, with a high near 93. Heat index values as high as 109. South wind 3 to 6 mph.
Sunday Night
Mostly clear, with a low around 75. South wind around 6 mph becoming calm after midnight.
Monday
Sunny, with a high near 95.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Sunny and hot, with a high near 97.
Tuesday Night
Clear, with a low around 76.
Wednesday
Sunny, with a high near 96.
Wednesday Night
Mostly clear, with a low around 77.
Thursday
Sunny, with a high near 96.
Thursday Night
Mostly clear, with a low around 76.
Friday
A 40 percent chance of showers and thunderstorms. Sunny, with a high near 95.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Byrnes Mill MO
 38.43°N 90.58°W (Elev. 495 ft)
Last Update:
7:11 pm CDT Jun 26, 2026
Forecast Valid:
8pm CDT Jun 26, 2026-6pm CDT Jul 3, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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