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

73°F

23°C

Humidity 94%
Wind Speed NE 6 mph
Barometer 30.01 in (1015.4 mb)
Dewpoint 71°F (22°C)
Visibility 8.00 mi
Last update 14 Jul 5:54 am CDT
Extended Forecast for

Byrnes Mill MO

  • Today

    Today: A 20 percent chance of showers and thunderstorms after 2pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 86. Light east wind.

    High: 86 °F

    Patchy Fog
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: Mostly cloudy, with a low around 70. Light east wind.

    Low: 70 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88. Calm wind becoming south around 5 mph in the afternoon.

    High: 88 °F

    Partly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 72. Calm wind. Chance of precipitation is 20%.

    Low: 72 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94. Calm wind becoming southwest around 6 mph in the morning.

    High: 94 °F

    Sunny then
    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 74.

    Low: 74 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94.

    High: 94 °F

    Sunny then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 73.

    Low: 73 °F

    Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 91.

    High: 91 °F

    Chance
    T-storms

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 2pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 86. Light east wind.
Tonight
Mostly cloudy, with a low around 70. Light east wind.
Tuesday
A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 72. Calm wind. Chance of precipitation is 20%.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94. Calm wind becoming southwest around 6 mph in the morning.
Wednesday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 74.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 73.
Friday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 91.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 92.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly 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 90.55°W (Elev. 597 ft)
Last Update:
5:21 am CDT Jul 14, 2025
Forecast Valid:
6am CDT Jul 14, 2025-6pm CDT Jul 20, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation