Altamont, Illinois Weather
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Click for Hazardous Weather Outlook for Altamont, Illinois
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Weather Forecast for Altamont, Illinois : Madison County
Issued: 10:26 pm CDT Jul 30, 2025 Latitude: 38.9231036 Longitude: -90.2098327 View on Google Maps

MouseOver for Detail Forecast
Overnight Thursday Friday Saturday Sunday Monday Tuesday Wednesday
20% chance of thunderstorms on Overnight 40% chance of thunderstorms on Thursday Mostly Sunny on Friday Sunny on Saturday Sunny on Sunday 20% chance of thunderstorms on Monday 20% chance of thunderstorms on Tuesday Mostly Sunny on Wednesday
Low: 71°F High: 78°F High: 79°F High: 79°F High: 81°F High: 83°F High: 84°F High: 87°F
Low: 63°F Low: 60°F Low: 61°F Low: 64°F Low: 67°F Low: 68°F  
Thunderstorms Thunderstorms Mostly Sunny Sunny Sunny Thunderstorms Thunderstorms Mostly Sunny
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Current Conditions at
ALTON - (KALN)
79°
Cloudy
as of 12:35 AM CDST
Rel. Humidity: 83%
Dew Point: 73°F
Visibility: 10 Miles
Pressure: 30.02 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 4400ft
Current Conditions at
ST CHARLES - (KSET)
79°
Cloudy
as of 11:54 PM CDST
Rel. Humidity: 88%
Dew Point: 75°F
Visibility: 10 Miles
Pressure: 30.02 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Few at 4500ft, Scattered at 5000ft, Solid Overcast at 7000ft
Current Conditions at
ST LOUIS - (KSTL)
81°
Cloudy
as of 11:51 PM CDST
Rel. Humidity: 83%
Dew Point: 75°F
Visibility: 10 Miles
Pressure: 30.03 in.
Flight Rule: VFR
Wind Data
3 MPH
070° East
Cloud Level(s): Broken at 3900ft, Solid Overcast at 11000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
75°
Mostly Cloudy
as of 11:53 PM CDST
Rel. Humidity: 94%
Dew Point: 73°F
Visibility: 10 Miles
Pressure: 30.01 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Broken at 5500ft
20% chance of thunderstorms Overnight Overnight... A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71. North wind around 6 mph.
40% chance of thunderstorms Thursday Thursday... A chance of showers and thunderstorms. Cloudy, with a high near 78. North wind 9 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 63. Northeast wind 9 to 11 mph.
Mostly Sunny on Friday Friday... Mostly sunny, with a high near 79. Northeast wind 9 to 13 mph.
Cloudy on Friday Night Friday Night... Partly cloudy, with a low around 60. Northeast wind 6 to 10 mph.
Sunny on Saturday Saturday... Sunny, with a high near 79.
Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 61.
Sunny on Sunday Sunday... Sunny, with a high near 81.
Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around 64.
20% chance of thunderstorms Monday Monday... A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83.
20% chance of thunderstorms Monday Night Monday Night... A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
20% chance of thunderstorms Tuesday Tuesday... A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 68.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 87.
Current Radar Image


Sun Almanac for Altamont, Illinois
Sunrise: 06:01 AM
Sunset: 8:13 PM
Civil Sunrise:05:32 AM
Civil Sunset: 8:43 PM
Nautical Sunrise: 04:55 AM
Nautical Sunset: 9:19 PM
Astro Sunrise: 04:16 AM
Astro Sunset: 9:59 PM
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