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

51°F

11°C

Humidity 59%
Wind Speed W 7 mph
Barometer 30.25 in (1024.3 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 19 Apr 8:54 am CDT
Extended Forecast for

Byrnes Mill MO

  • Today

    Today: Sunny, with a high near 68. West wind 5 to 11 mph, with gusts as high as 28 mph.

    High: 68 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 41. North wind around 5 mph becoming calm in the evening.

    Low: 41 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 70. Calm wind becoming southeast around 6 mph in the afternoon.

    High: 70 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 52. Southeast wind around 6 mph becoming southwest after midnight.

    Low: 52 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79. Southwest wind 6 to 10 mph, with gusts as high as 22 mph.

    High: 79 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 56.

    Low: 56 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 68. West wind 5 to 11 mph, with gusts as high as 28 mph.
Tonight
Partly cloudy, with a low around 41. North wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 70. Calm wind becoming southeast around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 52. Southeast wind around 6 mph becoming southwest after midnight.
Tuesday
Mostly sunny, with a high near 79. Southwest wind 6 to 10 mph, with gusts as high as 22 mph.
Tuesday Night
Clear, with a low around 56.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 59.
Thursday
Mostly sunny, with a high near 83.
Thursday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 63.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 76. Chance of precipitation is 70%.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 49.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 71.
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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:
7:36 am CDT Apr 19, 2026
Forecast Valid:
8am CDT Apr 19, 2026-6pm CDT Apr 25, 2026
 
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