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Alton, Illinois Weather Forecast
Alton, Illinois Weather
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Click for Hazardous Weather Outlook for Alton, Illinois
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Weather Forecast for Alton, Illinois : Madison County
Issued: 1:01 am CST Nov 9, 2025 Latitude: 38.8906038 Longitude: -90.1842764 View on Google Maps

MouseOver for Detail Forecast
Overnight Sunday Monday Veterans Day Wednesday Thursday Friday Saturday
20% chance of snow on Overnight 20% chance of snow on Sunday Sunny on Monday Partly Sunny on Veterans Day Sunny on Wednesday Mostly Sunny on Thursday Sunny on Friday Mostly Sunny on Saturday
Low: 35°F High: 39°F High: 41°F High: 55°F High: 63°F High: 63°F High: 71°F High: 75°F
Low: 24°F Low: 26°F Low: 41°F Low: 35°F Low: 46°F Low: 54°F  
Snow Snow Sunny Partly Sunny Sunny Mostly Sunny Sunny Mostly Sunny
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Current Conditions at
ALTON - (KALN)
45°
Cloudy
as of 12:55 AM CST
Rel. Humidity: 65%
Dew Point: 34°F
Visibility: 10 Miles
Pressure: 29.93 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 2200ft
Current Conditions at
ST CHARLES - (KSET)
43°
Feels like 32°F
Cloudy
as of 12:54 AM CST
Rel. Humidity: 70%
Dew Point: 34°F
Visibility: 10 Miles
Pressure: 29.95 in.
Flight Rule: MVFR
Wind Data
30 MPH
Gust: 40 MPH
300° Northwest
Cloud Level(s): Solid Overcast at 2600ft
Current Conditions at
ST LOUIS - (KSTL)
43°
Feels like 33°F
Mostly Cloudy
as of 12:51 AM CST
Rel. Humidity: 70%
Dew Point: 34°F
Visibility: 10 Miles
Pressure: 29.94 in.
Flight Rule: MVFR
Wind Data
23 MPH
Gust: 36 MPH
300° Northwest
Cloud Level(s): Broken at 2300ft, Broken at 3300ft
Current Conditions at
EAST ST LOUIS - (KCPS)
45°
Feels like 35°F
Cloudy
as of 12:53 AM CST
Rel. Humidity: 65%
Dew Point: 34°F
Visibility: 10 Miles
Pressure: 29.94 in.
Flight Rule: MVFR
Wind Data
24 MPH
Gust: 36 MPH
310° Northwest
Cloud Level(s): Broken at 2900ft, Solid Overcast at 3700ft
20% chance of snow Overnight Overnight... A chance of flurries after 5am. Cloudy, with a low around 35. Breezy, with a northwest wind 18 to 20 mph, with gusts as high as 31 mph.
20% chance of snow Sunday Sunday... A chance of flurries. Cloudy through mid morning, then gradual clearing, with a high near 39. Breezy, with a northwest wind 17 to 21 mph, with gusts as high as 31 mph.
20% chance of snow Sunday Night Sunday Night... A chance of flurries before 1am. Partly cloudy, with a low around 24. Northwest wind 11 to 15 mph, with gusts as high as 23 mph.
Sunny on Monday Monday... Sunny, with a high near 41. Northwest wind 9 to 16 mph, with gusts as high as 24 mph.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 26. West wind 5 to 7 mph becoming light and variable.
Partly Sunny on Veterans Day Veterans Day... Partly sunny, with a high near 55.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 41.
Sunny on Wednesday Wednesday... Sunny, with a high near 63.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 35.
Mostly Sunny on Thursday Thursday... Mostly sunny, with a high near 63.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 46.
Sunny on Friday Friday... Sunny, with a high near 71.
Cloudy on Friday Night Friday Night... Partly cloudy, with a low around 54.
Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 75.
Current Radar Image


Sun Almanac for Alton, Illinois
Sunrise: 06:37 AM
Sunset: 4:52 PM
Civil Sunrise:06:09 AM
Civil Sunset: 5:20 PM
Nautical Sunrise: 05:37 AM
Nautical Sunset: 5:52 PM
Astro Sunrise: 05:06 AM
Astro Sunset: 6:23 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.