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Fairmont, Illinois Weather Forecast
Fairmont, Illinois Weather
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 5:11 pm CST Nov 26, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Tonight Thanksgiving Day Friday Saturday Sunday Monday Tuesday Wednesday
Cloudy on Tonight Sunny on Thanksgiving Day Increasing Clouds on Friday 90% chance of rain & snow on Saturday Mostly Cloudy on Sunday 30% chance of snow on Monday Mostly Sunny on Tuesday Mostly Sunny on Wednesday
Low: 28°F High: 41°F High: 39°F High: 40°F High: 32°F High: 28°F High: 31°F High: 40°F
Low: 22°F Low: 30°F Low: 26°F Low: 17°F Low: 17°F Low: 19°F  
Cloudy Sunny Increasing Clouds Rain & Snow Mostly Cloudy Snow Mostly Sunny Mostly Sunny
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Current Conditions at
ALTON - (KALN)
41°
Feels like 32°F
Clear
as of 4:50 PM CST
Rel. Humidity: 38%
Dew Point: 18°F
Visibility: 10 Miles
Pressure: 30.24 in.
Flight Rule: VFR
Wind Data
16 MPH
Gust: 28 MPH
300° Northwest
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
41°
Feels like 34°F
Clear
as of 4:54 PM CST
Rel. Humidity: 41%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 30.25 in.
Flight Rule: VFR
Wind Data
10 MPH
Gust: 21 MPH
270° West
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
39°
Feels like 30°F
Partly Cloudy
as of 4:51 PM CST
Rel. Humidity: 44%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 30.25 in.
Flight Rule: VFR
Wind Data
16 MPH
Gust: 23 MPH
280° West
Cloud Level(s): Few at 6000ft, Scattered at 25000ft
Cloudy on Tonight Tonight... Partly cloudy, with a low around 28. West wind 8 to 15 mph, with gusts as high as 24 mph.
Sunny on Thanksgiving Day Thanksgiving Day... Sunny, with a high near 41. Northwest wind 8 to 11 mph, with gusts as high as 20 mph.
Clear on Thursday Night Thursday Night... Clear, with a low around 22. Northwest wind 3 to 8 mph.
Increasing Clouds on Friday Friday... Increasing clouds, with a high near 39. Light and variable wind becoming southwest around 5 mph in the afternoon.
50% chance of snow Friday Night Friday Night... A 50 percent chance of snow after midnight. Cloudy, with a low around 30. Southeast wind 5 to 13 mph.
90% chance of rain & snow Saturday Saturday... Snow before noon, then rain, possibly mixed with snow. High near 40. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.
60% chance of rain Saturday Night Saturday Night... Rain likely, mainly before midnight. Cloudy, with a low around 26. Chance of precipitation is 60%.
Mostly Cloudy on Sunday Sunday... Mostly cloudy, with a high near 32.
Mostly Cloudy on Sunday Night Sunday Night... Mostly cloudy, with a low around 17.
30% chance of snow Monday Monday... A 30 percent chance of snow, mainly after noon. Mostly cloudy, with a high near 28.
20% chance of snow Monday Night Monday Night... A 20 percent chance of snow. Mostly cloudy, with a low around 17.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 31.
Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 19.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 40.
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.