Altamont, Illinois Weather
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Weather Forecast for Altamont, Illinois : Madison County
Issued: 9:37 pm CDT Jul 8, 2025 Latitude: 38.9231036 Longitude: -90.2098327 View on Google Maps

MouseOver for Detail Forecast
Overnight Wednesday Thursday Friday Saturday Sunday Monday Tuesday
Morning Fog on Overnight 20% chance of thunderstorms on Wednesday 20% chance of thunderstorms on Thursday 30% chance of thunderstorms on Friday 40% chance of thunderstorms on Saturday 20% chance of thunderstorms on Sunday 30% chance of thunderstorms on Monday 30% chance of thunderstorms on Tuesday
Low: 69°F High: 87°F High: 90°F High: 93°F High: 87°F High: 86°F High: 89°F High: 92°F
Low: 71°F Low: 72°F Low: 74°F Low: 69°F Low: 70°F Low: 72°F  
Morning Fog Thunderstorms Thunderstorms Thunderstorms Thunderstorms Thunderstorms Thunderstorms Thunderstorms
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Current Conditions at
ALTON - (KALN)
70°
Clear
Mist
as of 1:55 AM CDST
Rel. Humidity: 100%
Dew Point: 70°F
Visibility: 4 Miles
Pressure: 30.05 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
70°
Clear
as of 1:54 AM CDST
Rel. Humidity: 94%
Dew Point: 68°F
Visibility: 8 Miles
Pressure: 30.03 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
72°
Mostly Cloudy
as of 1:51 AM CDST
Rel. Humidity: 94%
Dew Point: 70°F
Visibility: 9 Miles
Pressure: 30.05 in.
Flight Rule: VFR
Wind Data
5 MPH
220° Southwest
Cloud Level(s): Few at 800ft, Scattered at 20000ft, Broken at 25000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
72°
Clear
as of 1:53 AM CDST
Rel. Humidity: 94%
Dew Point: 70°F
Visibility: 9 Miles
Pressure: 30.04 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Morning Fog on Overnight Overnight... Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 69. Calm wind.
20% chance of thunderstorms Wednesday Wednesday... Isolated showers and thunderstorms after 4pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 87. Northwest wind 3 to 5 mph. Chance of precipitation is 20%.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 71. North wind around 5 mph becoming calm in the evening.
20% chance of thunderstorms Thursday Thursday... Isolated showers and thunderstorms after 10am. Mostly sunny, with a high near 90. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 20%.
20% chance of thunderstorms Thursday Night Thursday Night... A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. South wind 3 to 5 mph.
30% chance of thunderstorms Friday Friday... A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93.
40% chance of thunderstorms Friday Night Friday Night... A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.
40% chance of thunderstorms Saturday Saturday... A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 87.
30% chance of thunderstorms Saturday Night Saturday Night... A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 69.
20% chance of thunderstorms Sunday Sunday... A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86.
20% chance of rain Sunday Night Sunday Night... A 20 percent chance of showers. Mostly cloudy, with a low around 70.
30% chance of thunderstorms Monday Monday... A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.
20% chance of thunderstorms Monday Night Monday Night... A 20 percent chance of showers and thunderstorms. Mostly 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.
Current Radar Image


Sun Almanac for Altamont, 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: 03:48 AM
Astro Sunset: 10:24 PM
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