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: 12:06 am CDT Jun 1, 2025 Latitude: 38.8906038 Longitude: -90.1842764 View on Google Maps

MouseOver for Detail Forecast
Overnight Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Mostly Cloudy on Overnight Mostly Sunny on Sunday Sunny on Monday 20% chance of thunderstorms on Tuesday 70% chance of thunderstorms on Wednesday 70% chance of thunderstorms on Thursday 30% chance of thunderstorms on Friday 40% chance of thunderstorms on Saturday
Low: 58°F High: 84°F High: 88°F High: 91°F High: 83°F High: 78°F High: 82°F High: 82°F
Low: 61°F Low: 68°F Low: 73°F Low: 67°F Low: 64°F Low: 64°F  
Mostly Cloudy Mostly Sunny Sunny Thunderstorms Thunderstorms Thunderstorms Thunderstorms Thunderstorms
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Current Conditions at
ALTON - (KALN)
68°
Clear
as of 11:55 PM CDST
Rel. Humidity: 72%
Dew Point: 59°F
Visibility: 10 Miles
Pressure: 29.83 in.
Flight Rule: VFR
Wind Data
5 MPH
240° Southwest
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
66°
Clear
as of 11:54 PM CDST
Rel. Humidity: 77%
Dew Point: 59°F
Visibility: 10 Miles
Pressure: 29.81 in.
Flight Rule: VFR
Wind Data
5 MPH
220° Southwest
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
70°
Partly Cloudy
as of 11:51 PM CDST
Rel. Humidity: 64%
Dew Point: 57°F
Visibility: 10 Miles
Pressure: 29.83 in.
Flight Rule: VFR
Wind Data
5 MPH
280° West
Cloud Level(s): Few at 7000ft, Scattered at 25000ft
Mostly Cloudy on Overnight Overnight... Mostly cloudy, with a low around 58. Calm wind becoming east around 5 mph.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 84. East wind around 5 mph becoming light and variable in the afternoon.
Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around 61. Northeast wind around 5 mph becoming calm in the evening.
Sunny on Monday Monday... Sunny, with a high near 88. Light southeast wind becoming south 5 to 10 mph in the morning.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 68. South wind 7 to 10 mph.
20% chance of thunderstorms Tuesday Tuesday... A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91.
50% chance of thunderstorms Tuesday Night Tuesday Night... A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73.
70% chance of thunderstorms Wednesday Wednesday... Showers and thunderstorms likely. Mostly cloudy, with a high near 83. Chance of precipitation is 70%.
70% chance of thunderstorms Wednesday Night Wednesday Night... Showers and thunderstorms likely. Mostly cloudy, with a low around 67. Chance of precipitation is 70%.
70% chance of thunderstorms Thursday Thursday... Showers and thunderstorms likely. Cloudy, with a high near 78. Chance of precipitation is 70%.
50% chance of thunderstorms Thursday Night Thursday Night... A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
30% chance of thunderstorms Friday Friday... A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
30% chance of thunderstorms Friday Night Friday Night... A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 64.
40% chance of thunderstorms Saturday Saturday... A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
Sun Almanac for Alton, Illinois
Sunrise: 05:37 AM
Sunset: 8:20 PM
Civil Sunrise:05:06 AM
Civil Sunset: 8:52 PM
Nautical Sunrise: 04:26 AM
Nautical Sunset: 9:31 PM
Astro Sunrise: 03:42 AM
Astro Sunset: 10:16 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.