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

34°F

1°C

Humidity 92%
Wind Speed Calm
Barometer 30.08 in (1019.2 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 9 Jan 11:54 pm CST
Extended Forecast for

Byrnes Mill MO

  • Overnight

    Overnight: A 40 percent chance of rain, mainly after 3am. Mostly cloudy, with a steady temperature around 42. Calm wind becoming northwest around 5 mph.

    Low: 42 °F

    Chance Rain

  • Saturday

    Saturday: Rain likely, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a high near 47. Northwest wind 7 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

    High: 47 °F

    Rain Likely
    then Sunny

  • Saturday Night

    Saturday Night: A slight chance of rain before 9pm, then a slight chance of snow between 9pm and 11pm. Partly cloudy, with a low around 24. Northwest wind 9 to 11 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.

    Low: 24 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Clear

  • Sunday

    Sunday: Sunny, with a high near 39. Northwest wind 5 to 10 mph becoming light west in the afternoon. Winds could gust as high as 24 mph.

    High: 39 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 26. Calm wind becoming southwest around 5 mph after midnight.

    Low: 26 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 58.

    High: 58 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 40 percent chance of rain, mainly after 3am. Mostly cloudy, with a steady temperature around 42. Calm wind becoming northwest around 5 mph.
Saturday
Rain likely, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a high near 47. Northwest wind 7 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Saturday Night
A slight chance of rain before 9pm, then a slight chance of snow between 9pm and 11pm. Partly cloudy, with a low around 24. Northwest wind 9 to 11 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.
Sunday
Sunny, with a high near 39. Northwest wind 5 to 10 mph becoming light west in the afternoon. Winds could gust as high as 24 mph.
Sunday Night
Mostly clear, with a low around 26. Calm wind becoming southwest around 5 mph after midnight.
Monday
Sunny, with a high near 53.
Monday Night
Mostly clear, with a low around 36.
Tuesday
Partly sunny, with a high near 58.
Tuesday Night
Mostly cloudy, with a low around 38.
Wednesday
Mostly cloudy, with a high near 44.
Wednesday Night
Mostly cloudy, with a low around 22.
Thursday
Mostly sunny, with a high near 37.
Thursday Night
Partly cloudy, with a low around 26.
Friday
Partly sunny, with a high near 45.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Byrnes Mill MO
 38.45°N 90.58°W (Elev. 525 ft)
Last Update:
10:31 pm CST Jan 9, 2026
Forecast Valid:
12am CST Jan 10, 2026-6pm CST Jan 16, 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