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

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

58°F

14°C

Humidity 41%
Wind Speed N 5 mph
Barometer 30.48 in (1032.2 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 17 Oct 3:53 pm CDT
Extended Forecast for

3 Miles SE Crystal City MO

Frost Advisory October 18, 01:00am until October 18, 09:00am
Click here for hazard details and duration
Frost Advisory

  • Tonight

    Tonight: Patchy fog after 5am. Patchy frost after 4am. Otherwise, clear, with a low around 34. Light and variable wind.

    Low: 34 °F

    Clear then
    Patchy Frost
    and Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 9am. Patchy frost before 8am. Otherwise, sunny, with a high near 71. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 71 °F

    Patchy Frost
    and Patchy
    Fog then
    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 35. Light and variable wind.

    Low: 35 °F

    Clear

  • Monday

    Monday: Patchy frost before 8am. Otherwise, sunny, with a high near 74. Light and variable wind.

    High: 74 °F

    Patchy Frost
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 38. Calm wind.

    Low: 38 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 5am. Patchy frost after 4am. Otherwise, clear, with a low around 34. Light and variable wind.
Sunday
Patchy fog before 9am. Patchy frost before 8am. Otherwise, sunny, with a high near 71. Calm wind becoming southeast around 5 mph in the afternoon.
Sunday Night
Clear, with a low around 35. Light and variable wind.
Monday
Patchy frost before 8am. Otherwise, sunny, with a high near 74. Light and variable wind.
Monday Night
Mostly clear, with a low around 38. Calm wind.
Tuesday
Sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 39.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 43.
Thursday
Sunny, with a high near 81.
Thursday Night
Mostly clear, with a low around 45.
Friday
Sunny, with a high near 80.
Friday Night
Mostly clear, with a low around 46.
Saturday
Mostly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Crystal City MO
 38.2°N 90.34°W (Elev. 377 ft)
Last Update:
2:20 pm CDT Oct 17, 2026
Forecast Valid:
4pm CDT Oct 17, 2026-6pm CDT Oct 24, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation