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.

Overcast

70°F

21°C

Humidity 97%
Wind Speed Calm
Barometer 29.86 in (1010.4 mb)
Dewpoint 69°F (21°C)
Visibility 9.00 mi
Last update 17 Jun 2:54 am CDT
Extended Forecast for

Byrnes Mill MO

  • Overnight

    Overnight: Patchy fog. Otherwise, mostly cloudy, with a low around 69. Calm wind.

    Low: 69 °F

    Patchy Fog

  • Tuesday

    Tuesday: Areas of fog before 9am. Otherwise, mostly sunny, with a high near 90. Light and variable wind.

    High: 90 °F

    Areas Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms after 2am. Increasing clouds, with a low around 71. Calm wind becoming south around 5 mph after midnight.

    Low: 71 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 1pm, then showers and possibly a thunderstorm between 1pm and 4pm, then showers and thunderstorms after 4pm. High near 85. Southwest wind 6 to 9 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.

    High: 85 °F

    Chance
    T-storms then
    T-storms

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Low around 66. Southwest wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 80%.

    Low: 66 °F

    T-storms then
    Chance
    Showers

  • Juneteenth

    Juneteenth: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Overnight
Patchy fog. Otherwise, mostly cloudy, with a low around 69. Calm wind.
Tuesday
Areas of fog before 9am. Otherwise, mostly sunny, with a high near 90. Light and variable wind.
Tuesday Night
A 20 percent chance of showers and thunderstorms after 2am. Increasing clouds, with a low around 71. Calm wind becoming south around 5 mph after midnight.
Wednesday
A chance of showers and thunderstorms before 1pm, then showers and possibly a thunderstorm between 1pm and 4pm, then showers and thunderstorms after 4pm. High near 85. Southwest wind 6 to 9 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.
Wednesday Night
Showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Low around 66. Southwest wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 80%.
Juneteenth
Sunny, with a high near 86.
Thursday Night
Mostly clear, with a low around 66.
Friday
Sunny, with a high near 92.
Friday Night
Mostly clear, with a low around 75.
Saturday
Sunny and hot, with a high near 97.
Saturday Night
Mostly clear, with a low around 76.
Sunday
Sunny and hot, with a high near 97.
Sunday Night
Mostly clear, with a low around 75.
Monday
Sunny, with a high near 95.
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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:
1:36 am CDT Jun 17, 2025
Forecast Valid:
3am CDT Jun 17, 2025-6pm CDT Jun 23, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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