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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Weldon Spring MO

  • Tonight

    Tonight: Mostly clear, with a low around 12. West wind around 5 mph becoming calm in the evening.

    Low: 12 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 39. Light south wind increasing to 5 to 9 mph in the morning.

    High: 39 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 32. South wind 8 to 14 mph becoming southwest after midnight. Winds could gust as high as 28 mph.

    Low: 32 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, then gradually becoming sunny, with a high near 44. West wind 7 to 11 mph, with gusts as high as 23 mph.

    High: 44 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 23. Southwest wind 6 to 8 mph becoming northwest after midnight.

    Low: 23 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 11.

    Low: 11 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 18.

    High: 18 °F

    Cold

  • Friday Night

    Friday Night: A 20 percent chance of snow. Mostly cloudy, with a low around 0.

    Low: 0 °F

    Slight Chance
    Snow

Detailed Forecast

Tonight
Mostly clear, with a low around 12. West wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 39. Light south wind increasing to 5 to 9 mph in the morning.
Tuesday Night
Increasing clouds, with a low around 32. South wind 8 to 14 mph becoming southwest after midnight. Winds could gust as high as 28 mph.
Wednesday
Partly sunny, then gradually becoming sunny, with a high near 44. West wind 7 to 11 mph, with gusts as high as 23 mph.
Wednesday Night
Mostly clear, with a low around 23. Southwest wind 6 to 8 mph becoming northwest after midnight.
Thursday
Mostly sunny, with a high near 37.
Thursday Night
Mostly cloudy, with a low around 11.
Friday
Mostly cloudy and cold, with a high near 18.
Friday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 0.
Saturday
A 30 percent chance of snow, mainly after noon. Mostly cloudy and cold, with a high near 13.
Saturday Night
A 30 percent chance of snow. Partly cloudy, with a low around 3.
Sunday
Mostly sunny, with a high near 23.
Sunday Night
Mostly clear, with a low around 10.
Monday
Sunny, with a high near 34.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Weldon Spring MO
 38.72°N 90.65°W (Elev. 584 ft)
Last Update:
3:16 pm CST Jan 19, 2026
Forecast Valid:
3pm CST Jan 19, 2026-6pm CST Jan 26, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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