Alton, Illinois Weather
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Weather Forecast for Alton, Illinois : Madison County
Issued: 4:52 am CDT Jun 17, 2025 Latitude: 38.8906038 Longitude: -90.1842764 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Wednesday Juneteenth Friday Saturday Sunday Monday
Mostly Sunny on Today 30% chance of thunderstorms on Tonight 80% chance of thunderstorms on Wednesday Sunny on Juneteenth Sunny on Friday Sunny on Saturday Sunny on Sunday Sunny on Monday
High: 90°F Low: 73°F High: 85°F High: 86°F High: 91°F High: 97°F High: 96°F High: 95°F
Low: 67°F Low: 68°F Low: 75°F Low: 77°F Low: 76°F  
Mostly Sunny Thunderstorms Thunderstorms Sunny Sunny Sunny Sunny Sunny
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Current Conditions at
ALTON - (KALN)
72°
Cloudy
Mist
as of 8:17 AM CDST
Rel. Humidity: 94%
Dew Point: 70°F
Visibility: 2 Miles
Pressure: 29.91 in.
Flight Rule: LIFR
Wind Data
3 MPH
Cloud Level(s): Solid Overcast at 300ft
Current Conditions at
ST CHARLES - (KSET)
73°
Cloudy
Mist
as of 7:54 AM CDST
Rel. Humidity: 88%
Dew Point: 70°F
Visibility: 4 Miles
Pressure: 29.88 in.
Flight Rule: IFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 500ft
Current Conditions at
ST LOUIS - (KSTL)
77°
Partly Cloudy
as of 8:38 AM CDST
Rel. Humidity: 83%
Dew Point: 72°F
Visibility: 9 Miles
Pressure: 29.89 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Scattered at 600ft, Scattered at 25000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
72°
Cloudy
Mist
as of 7:53 AM CDST
Rel. Humidity: 100%
Dew Point: 72°F
Visibility: 3 Miles
Pressure: 29.89 in.
Flight Rule: LIFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 300ft
Mostly Sunny on Today Today... Mostly sunny, with a high near 90. Calm wind becoming south around 5 mph in the afternoon.

30% chance of thunderstorms Tonight Tonight... A 30 percent chance of showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 73. South wind around 6 mph.

80% chance of thunderstorms Wednesday Wednesday... Showers and thunderstorms. High near 85. Southwest wind 8 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.

30% chance of thunderstorms Wednesday Night Wednesday Night... A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 67. Southwest wind 5 to 11 mph. Chance of precipitation is 30%.

Sunny on Juneteenth Juneteenth... Sunny, with a high near 86. West wind around 6 mph.

Mostly Clear on Thursday Night Thursday Night... Mostly clear, with a low around 68.

Sunny on Friday Friday... Sunny, with a high near 91.

Mostly Clear on Friday Night Friday Night... Mostly clear, with a low around 75.

Sunny on Saturday Saturday... Sunny and hot, with a high near 97.

Mostly Clear on Saturday Night Saturday Night... Mostly clear, with a low around 77.

Sunny on Sunday Sunday... Sunny, with a high near 96.

Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 76.

Sunny on Monday Monday... Sunny, with a high near 95.

Current Radar Image


Sun Almanac for Alton, Illinois
Sunrise: 05:35 AM
Sunset: 8:29 PM
Civil Sunrise:05:03 AM
Civil Sunset: 9:01 PM
Nautical Sunrise: 04:23 AM
Nautical Sunset: 9:41 PM
Astro Sunrise: 03:36 AM
Astro Sunset: 10:27 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.