Alton, Illinois Weather
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Weather Forecast for Alton, Illinois : Madison County
Issued: 9:07 pm CDT Jul 9, 2025 Latitude: 38.8906038 Longitude: -90.1842764 View on Google Maps

MouseOver for Detail Forecast
Tonight Thursday Friday Saturday Sunday Monday Tuesday Wednesday
Mostly Clear on Tonight 20% chance of thunderstorms on Thursday Mostly Sunny on Friday 50% chance of thunderstorms on Saturday 30% chance of thunderstorms on Sunday 30% chance of thunderstorms on Monday 30% chance of thunderstorms on Tuesday 40% chance of thunderstorms on Wednesday
Low: 71°F High: 92°F High: 95°F High: 91°F High: 88°F High: 89°F High: 92°F High: 91°F
Low: 73°F Low: 75°F Low: 72°F Low: 71°F Low: 72°F Low: 73°F  
Mostly Clear Thunderstorms Mostly Sunny Thunderstorms Thunderstorms Thunderstorms Thunderstorms Thunderstorms
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Current Conditions at
ALTON - (KALN)
79°
Clear
as of 8:50 PM CDST
Rel. Humidity: 69%
Dew Point: 68°F
Visibility: 10 Miles
Pressure: 29.98 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
79°
Clear
as of 8:54 PM CDST
Rel. Humidity: 83%
Dew Point: 73°F
Visibility: 10 Miles
Pressure: 29.97 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
81°
Mostly Clear
as of 8:51 PM CDST
Rel. Humidity: 61%
Dew Point: 66°F
Visibility: 10 Miles
Pressure: 29.99 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Few at 5000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
81°
Clear
as of 8:53 PM CDST
Rel. Humidity: 61%
Dew Point: 66°F
Visibility: 10 Miles
Pressure: 29.97 in.
Flight Rule: VFR
Wind Data
3 MPH
0° North
Cloud Level(s): Clear
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 71. Calm wind.
20% chance of thunderstorms Thursday Thursday... A 20 percent chance of showers and thunderstorms after 3pm. Sunny, with a high near 92. Calm wind becoming west around 5 mph.
20% chance of thunderstorms Thursday Night Thursday Night... A 20 percent chance of showers and thunderstorms before 10pm. Mostly clear, with a low around 73. Southeast wind around 6 mph becoming calm after midnight.
Mostly Sunny on Friday Friday... Mostly sunny, with a high near 95. South wind 3 to 8 mph.
30% chance of thunderstorms Friday Night Friday Night... A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75. South wind 5 to 7 mph.
50% chance of thunderstorms Saturday Saturday... A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 91.
40% chance of thunderstorms Saturday Night Saturday Night... A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 72.
30% chance of thunderstorms Sunday Sunday... A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88.
20% chance of thunderstorms Sunday Night Sunday Night... A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 71.
30% chance of thunderstorms Monday Monday... A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 89.
20% chance of thunderstorms Monday Night Monday Night... A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
30% chance of thunderstorms Tuesday Tuesday... A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
30% chance of thunderstorms Tuesday Night Tuesday Night... A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73.
40% chance of thunderstorms Wednesday Wednesday... A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Current Radar Image


Sun Almanac for Alton, Illinois
Sunrise: 05:44 AM
Sunset: 8:28 PM
Civil Sunrise:05:13 AM
Civil Sunset: 9:00 PM
Nautical Sunrise: 04:33 AM
Nautical Sunset: 9:39 PM
Astro Sunrise: 03:49 AM
Astro Sunset: 10:24 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.