National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Mostly Cloudy

9°F

-13°C

Humidity 77%
Wind Speed S 3 mph
Barometer 30.45 in (1031.7 mb)
Dewpoint 3°F (-16°C)
Visibility 10.00 mi
Last update 20 Jan 3:53 am CST
Extended Forecast for

Crystal City MO

  • Overnight

    Overnight: Mostly clear, with a low around 7. Calm wind.

    Low: 7 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 38. Calm wind becoming south 5 to 9 mph in the morning.

    High: 38 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 27. South wind 8 to 10 mph, with gusts as high as 22 mph.

    Low: 27 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Cloudy through mid morning, then gradual clearing, with a high near 48. West wind 3 to 8 mph. Winds could gust as high as 20 mph.

    High: 48 °F

    Gradual
    Clearing

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 23. Light and variable wind.

    Low: 23 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 40.

    High: 40 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 14.

    Low: 14 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 21.

    High: 21 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 40 percent chance of snow. Mostly cloudy, with a low around 3.

    Low: 3 °F

    Chance Snow

Detailed Forecast

Overnight
Mostly clear, with a low around 7. Calm wind.
Tuesday
Mostly cloudy, then gradually becoming sunny, with a high near 38. Calm wind becoming south 5 to 9 mph in the morning.
Tuesday Night
Increasing clouds, with a low around 27. South wind 8 to 10 mph, with gusts as high as 22 mph.
Wednesday
Cloudy through mid morning, then gradual clearing, with a high near 48. West wind 3 to 8 mph. Winds could gust as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 23. Light and variable wind.
Thursday
Mostly sunny, with a high near 40.
Thursday Night
Mostly cloudy, with a low around 14.
Friday
Mostly cloudy, with a high near 21.
Friday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 3.
Saturday
A 40 percent chance of snow. Mostly cloudy and cold, with a high near 16.
Saturday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 6.
Sunday
Mostly sunny, with a high near 26.
Sunday Night
Mostly clear, with a low around 7.
Monday
Sunny, with a high near 32.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Crystal City MO
 38.22°N 90.39°W (Elev. 446 ft)
Last Update:
3:15 am CST Jan 20, 2026
Forecast Valid:
3am CST Jan 20, 2026-6pm CST Jan 26, 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