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Swansea, Illinois Weather Forecast
Swansea, Illinois Weather
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Weather Forecast for Swansea, Illinois : St. Clair County
Issued: 2:21 am CST Dec 21, 2025 Latitude: 38.5339392 Longitude: -89.9889936 View on Google Maps

MouseOver for Detail Forecast
Overnight Sunday Monday Tuesday Wednesday Christmas Day Friday Saturday
Cloudy on Overnight Mostly Sunny on Sunday Increasing Clouds on Monday Sunny on Tuesday Cloudy on Wednesday Mostly Sunny on Christmas Day Partly Sunny on Friday Mostly Cloudy on Saturday
Low: 27°F High: 44°F High: 52°F High: 63°F High: 69°F High: 73°F High: 61°F High: 58°F
Low: 30°F Low: 45°F Low: 46°F Low: 58°F Low: 51°F Low: 41°F  
Cloudy Mostly Sunny Increasing Clouds Sunny Cloudy Mostly Sunny Partly Sunny Mostly Cloudy
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Current Conditions at
SCOTT AFB - (KBLV)
28°
Clear
as of 1:55 AM CST
Rel. Humidity: 68%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 30.31 in.
Flight Rule: VFR
Wind Data
5 MPH
0° North
Cloud Level(s): Clear
Current Conditions at
EAST ST LOUIS - (KCPS)
30°
Clear
as of 1:53 AM CST
Rel. Humidity: 58%
Dew Point: 18°F
Visibility: 10 Miles
Pressure: 30.31 in.
Flight Rule: VFR
Wind Data
3 MPH
0° North
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
34°
Partly Cloudy
as of 1:51 AM CST
Rel. Humidity: 50%
Dew Point: 18°F
Visibility: 10 Miles
Pressure: 30.32 in.
Flight Rule: VFR
Wind Data
5 MPH
330° Northwest
Cloud Level(s): Scattered at 25000ft
Current Conditions at
SPARTA - (KSAR)
34°
Clear
as of 2:35 AM CST
Rel. Humidity: 55%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 30.33 in.
Flight Rule: VFR
Wind Data
5 MPH
340° North
Cloud Level(s): Clear
Cloudy on Overnight Overnight... Partly cloudy, with a low around 27. Light north wind.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 44. Calm wind becoming east around 5 mph.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 30. Southeast wind 3 to 6 mph.
Increasing Clouds on Monday Monday... Increasing clouds, with a high near 52. South wind 6 to 10 mph.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 45. South wind 5 to 9 mph.
Sunny on Tuesday Tuesday... Sunny, with a high near 63.
Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 46.
Cloudy on Wednesday Wednesday... Cloudy, with a high near 69.
Mostly Cloudy on Wednesday Night Wednesday Night... Mostly cloudy, with a low around 58.
Mostly Sunny on Christmas Day Christmas Day... Mostly sunny, with a high near 73.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 51.
Partly Sunny on Friday Friday... Partly sunny, with a high near 61.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 41.
Mostly Cloudy on Saturday Saturday... Mostly cloudy, with a high near 58.
Current Radar Image


Sun Almanac for Swansea, Illinois
Sunrise: 07:14 AM
Sunset: 4:42 PM
Civil Sunrise:06:44 AM
Civil Sunset: 5:12 PM
Nautical Sunrise: 06:11 AM
Nautical Sunset: 5:46 PM
Astro Sunrise: 05:39 AM
Astro Sunset: 6:18 PM
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