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

42°F

6°C

Humidity 53%
Wind Speed S 6 mph
Barometer 30.01 in (1016.1 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 13 Jan 2:53 am CST
Extended Forecast for

Swansea IL

  • Overnight

    Overnight: Partly cloudy, with a low around 35. Southwest wind around 7 mph.

    Low: 35 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 64. West wind 8 to 14 mph, with gusts as high as 26 mph.

    High: 64 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 50 percent chance of rain, mainly before 1am. Mostly cloudy, with a low around 37. West wind 8 to 11 mph, with gusts as high as 20 mph.

    Low: 37 °F

    Chance Rain

  • Wednesday

    Wednesday: Partly sunny, with a temperature falling to around 31 by 5pm. Northwest wind 11 to 18 mph, with gusts as high as 29 mph.

    High: 39 °F⇓

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 18. North wind 7 to 15 mph, with gusts as high as 23 mph.

    Low: 18 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 32.

    High: 32 °F

    Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of snow. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Slight Chance
    Snow

  • Friday

    Friday: Partly sunny, with a high near 44. Breezy.

    High: 44 °F

    Partly Sunny
    then Partly
    Sunny and
    Breezy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 21.

    Low: 21 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 35. Southwest wind around 7 mph.
Tuesday
Increasing clouds, with a high near 64. West wind 8 to 14 mph, with gusts as high as 26 mph.
Tuesday Night
A 50 percent chance of rain, mainly before 1am. Mostly cloudy, with a low around 37. West wind 8 to 11 mph, with gusts as high as 20 mph.
Wednesday
Partly sunny, with a temperature falling to around 31 by 5pm. Northwest wind 11 to 18 mph, with gusts as high as 29 mph.
Wednesday Night
Mostly clear, with a low around 18. North wind 7 to 15 mph, with gusts as high as 23 mph.
Thursday
Sunny, with a high near 32.
Thursday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 27.
Friday
Partly sunny, with a high near 44. Breezy.
Friday Night
Mostly cloudy, with a low around 21.
Saturday
Partly sunny, with a high near 31.
Saturday Night
Mostly cloudy, with a low around 11.
Sunday
Mostly sunny, with a high near 25.
Sunday Night
Mostly clear, with a low around 13.
M.L.King Day
Sunny, with a high near 35.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Swansea IL
 38.55°N 89.95°W (Elev. 541 ft)
Last Update:
2:41 am CST Jan 13, 2026
Forecast Valid:
3am CST Jan 13, 2026-6pm CST Jan 19, 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