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Fairmont, Illinois Weather Forecast
Fairmont, Illinois Weather
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 12:26 am CST Nov 26, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Overnight Wednesday Thanksgiving Day Friday Saturday Sunday Monday Tuesday
Mostly Cloudy on Overnight Partly Sunny on Wednesday Sunny on Thanksgiving Day Mostly Sunny on Friday 80% chance of rain & snow on Saturday 20% chance of rain on Sunday 20% chance of rain & snow on Monday Partly Sunny on Tuesday
Low: 34°F High: 45°F High: 42°F High: 39°F High: 40°F High: 35°F High: 31°F High: 32°F
Low: 26°F Low: 23°F Low: 29°F Low: 27°F Low: 18°F Low: 19°F  
Mostly Cloudy Partly Sunny Sunny Mostly Sunny Rain & Snow Rain Rain & Snow Partly Sunny
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Current Conditions at
ALTON - (KALN)
41°
Feels like 30°F
Partly Cloudy
as of 1:55 AM CST
Rel. Humidity: 56%
Dew Point: 27°F
Visibility: 10 Miles
Pressure: 30.04 in.
Flight Rule: VFR
Wind Data
24 MPH
Gust: 37 MPH
270° West
Cloud Level(s): Scattered at 4000ft
Current Conditions at
ST CHARLES - (KSET)
39°
Feels like 28°F
Clear
as of 1:54 AM CST
Rel. Humidity: 55%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 30.05 in.
Flight Rule: VFR
Wind Data
23 MPH
Gust: 37 MPH
280° West
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
39°
Feels like 29°F
Partly Cloudy
as of 1:51 AM CST
Rel. Humidity: 60%
Dew Point: 27°F
Visibility: 10 Miles
Pressure: 30.06 in.
Flight Rule: VFR
Wind Data
21 MPH
Gust: 30 MPH
270° West
Cloud Level(s): Few at 4000ft, Scattered at 25000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
41°
Feels like 33°F
Clear
as of 1:53 AM CST
Rel. Humidity: 56%
Dew Point: 27°F
Visibility: 10 Miles
Pressure: 30.06 in.
Flight Rule: VFR
Wind Data
15 MPH
Gust: 25 MPH
280° West
Cloud Level(s): Clear
Mostly Cloudy on Overnight Overnight... Clear early, then becoming mostly cloudy, with a low around 34. Breezy, with a west wind 17 to 20 mph, with gusts as high as 33 mph.
Partly Sunny on Wednesday Wednesday... Partly sunny, then gradually becoming sunny, with a high near 45. Breezy, with a west wind 16 to 23 mph, with gusts as high as 36 mph.
Increasing Clouds on Wednesday Night Wednesday Night... Increasing clouds, with a low around 26. West wind 8 to 14 mph, with gusts as high as 22 mph.
Sunny on Thanksgiving Day Thanksgiving Day... Sunny, with a high near 42. Northwest wind 8 to 11 mph, with gusts as high as 20 mph.
Mostly Clear on Thursday Night Thursday Night... Mostly clear, with a low around 23. Northwest wind 5 to 7 mph becoming calm after midnight.
Mostly Sunny on Friday Friday... Mostly sunny, with a high near 39.
60% chance of snow Friday Night Friday Night... Snow likely after midnight. Cloudy, with a low around 29. Chance of precipitation is 60%.
80% chance of rain & snow Saturday Saturday... Rain and snow. High near 40. Chance of precipitation is 80%.
60% chance of rain & snow Saturday Night Saturday Night... Rain likely before midnight, then a chance of rain and snow. Cloudy, with a low around 27. Chance of precipitation is 60%.
20% chance of rain Sunday Sunday... A 20 percent chance of rain before noon. Mostly cloudy, with a high near 35.
20% chance of rain & snow Sunday Night Sunday Night... A slight chance of rain and snow. Mostly cloudy, with a low around 18. Chance of precipitation is 20%.
20% chance of rain & snow Monday Monday... A slight chance of rain and snow. Mostly cloudy, with a high near 31. Chance of precipitation is 20%.
20% chance of snow Monday Night Monday Night... A 20 percent chance of snow. Mostly cloudy, with a low around 19.
Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 32.
Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 06:56 AM
Sunset: 4:41 PM
Civil Sunrise:06:27 AM
Civil Sunset: 5:10 PM
Nautical Sunrise: 05:54 AM
Nautical Sunset: 5:43 PM
Astro Sunrise: 05:22 AM
Astro Sunset: 6:15 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.