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

55°F

13°C

Humidity 25%
Wind Speed SW 12 G 24 mph
Barometer 29.58 in (1002.0 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill52°F (11°C)
Last update 24 Feb 3:54 pm CST
Extended Forecast for

Byrnes Mill MO

  • Tonight

    Tonight: Mostly cloudy, with a low around 35. Southwest wind 5 to 8 mph becoming calm after midnight. Winds could gust as high as 21 mph.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 55. Light and variable wind.

    High: 55 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 36. Calm wind.

    Low: 36 °F

    Slight Chance
    Rain then
    Chance Rain

  • Thursday

    Thursday: A 20 percent chance of rain before noon. Partly sunny, with a high near 53. Calm wind becoming east around 5 mph.

    High: 53 °F

    Slight Chance
    Rain then
    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 34. Calm wind.

    Low: 34 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain. Partly cloudy, with a low around 33.

    Low: 33 °F

    Slight Chance
    Rain

Detailed Forecast

Tonight
Mostly cloudy, with a low around 35. Southwest wind 5 to 8 mph becoming calm after midnight. Winds could gust as high as 21 mph.
Wednesday
Partly sunny, with a high near 55. Light and variable wind.
Wednesday Night
A 50 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 36. Calm wind.
Thursday
A 20 percent chance of rain before noon. Partly sunny, with a high near 53. Calm wind becoming east around 5 mph.
Thursday Night
Mostly clear, with a low around 34. Calm wind.
Friday
Sunny, with a high near 68.
Friday Night
Mostly clear, with a low around 42.
Saturday
Sunny, with a high near 71.
Saturday Night
A 20 percent chance of rain. Partly cloudy, with a low around 33.
Sunday
A 40 percent chance of rain. Partly sunny, with a high near 49.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 33. Chance of precipitation is 40%.
Monday
A 30 percent chance of rain. Mostly cloudy, with a high near 53.
Monday Night
A 30 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 34.
Tuesday
A 50 percent chance of rain. Mostly cloudy, with a high near 56.
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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:
3:36 pm CST Feb 24, 2026
Forecast Valid:
4pm CST Feb 24, 2026-6pm CST Mar 3, 2026
 
Forecast Discussion
 
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Additional Resources

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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