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.

Fair

38°F

3°C

Humidity 26%
Wind Speed S 10 mph
Barometer 30.29 in (1026.3 mb)
Dewpoint 6°F (-14°C)
Visibility 10.00 mi
Wind Chill31°F (-1°C)
Last update 20 Jan 2:53 pm CST
Extended Forecast for

3 Miles WNW Swansea IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 36. South wind around 10 mph, with gusts as high as 21 mph.

    High: 36 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 29. South wind 10 to 13 mph, with gusts as high as 22 mph.

    Low: 29 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 44. West wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 44 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 24. Southwest wind 5 to 8 mph becoming northwest after midnight.

    Low: 24 °F

    Mostly Clear

  • Thursday

    Thursday: Partly sunny, with a high near 38. North wind around 6 mph becoming calm in the afternoon.

    High: 38 °F

    Partly 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 16.

    High: 16 °F

    Cold

  • Friday Night

    Friday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 4.

    Low: 4 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Saturday

    Saturday: A 40 percent chance of snow. Cloudy and cold, with a high near 14.

    High: 14 °F

    Chance Snow

Detailed Forecast

This Afternoon
Sunny, with a high near 36. South wind around 10 mph, with gusts as high as 21 mph.
Tonight
Increasing clouds, with a low around 29. South wind 10 to 13 mph, with gusts as high as 22 mph.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 44. West wind 7 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 24. Southwest wind 5 to 8 mph becoming northwest after midnight.
Thursday
Partly sunny, with a high near 38. North wind around 6 mph becoming calm in the afternoon.
Thursday Night
Mostly cloudy, with a low around 11.
Friday
Mostly cloudy and cold, with a high near 16.
Friday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 4.
Saturday
A 40 percent chance of snow. Cloudy and cold, with a high near 14.
Saturday Night
A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 9.
Sunday
Partly sunny, with a high near 22.
Sunday Night
Partly cloudy, with a low around 7.
Monday
Mostly sunny, with a high near 25.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Swansea IL
 38.57°N 90.04°W (Elev. 486 ft)
Last Update:
2:51 pm CST Jan 20, 2026
Forecast Valid:
2pm CST Jan 20, 2026-6pm CST Jan 26, 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