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

74°F

23°C

Humidity 57%
Wind Speed NE 5 mph
Barometer 30.04 in (1016.7 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 3 Aug 7:54 pm CDT
Extended Forecast for

Byrnes Mill MO

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 61. Light northeast wind.

    Low: 61 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 3pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 83. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 83 °F

    Patchy Fog
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Partly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 86. Calm wind.

    High: 86 °F

    Patchy Fog
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 61. Light northeast wind.
Monday
A 20 percent chance of showers and thunderstorms after 3pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 83. Calm wind becoming northeast around 5 mph in the afternoon.
Monday Night
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 66. Calm wind.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 86. Calm wind.
Tuesday Night
Mostly clear, with a low around 67. Calm wind.
Wednesday
Sunny, with a high near 89.
Wednesday Night
Mostly clear, with a low around 68.
Thursday
Sunny, with a high near 90.
Thursday Night
Mostly clear, with a low around 70.
Friday
Sunny, with a high near 92.
Friday Night
Mostly clear, with a low around 72.
Saturday
Sunny, with a high near 93.
Saturday Night
Mostly clear, with a low around 73.
Sunday
Sunny, with a high near 94.
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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:
6:06 pm CDT Aug 3, 2025
Forecast Valid:
8pm CDT Aug 3, 2025-6pm CDT Aug 10, 2025
 
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