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Fairmont, Illinois Weather Forecast
Fairmont, Illinois Weather
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 10:46 am CST Nov 27, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Thanksgiving Day Tonight Friday Saturday Sunday Monday Tuesday Wednesday
Sunny on Thanksgiving Day Clear on Tonight Increasing Clouds on Friday 100% chance of rain & snow on Saturday Mostly Cloudy on Sunday Mostly Cloudy on Monday Mostly Sunny on Tuesday Mostly Sunny on Wednesday
High: 42°F Low: 22°F High: 37°F High: 37°F High: 31°F High: 27°F High: 31°F High: 40°F
  Low: 30°F Low: 25°F Low: 16°F Low: 16°F Low: 19°F  
Sunny Clear Increasing Clouds Rain & Snow Mostly Cloudy Mostly Cloudy Mostly Sunny Mostly Sunny
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Current Conditions at
ALTON - (KALN)
36°
Feels like 26°F
Clear
as of 11:45 AM CST
Rel. Humidity: 51%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 30.41 in.
Flight Rule: VFR
Wind Data
14 MPH
320° Northwest
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
36°
Feels like 27°F
Clear
as of 11:54 AM CST
Rel. Humidity: 51%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 30.42 in.
Flight Rule: VFR
Wind Data
12 MPH
280° West
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
36°
Feels like 27°F
Mostly Clear
as of 11:51 AM CST
Rel. Humidity: 55%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.42 in.
Flight Rule: VFR
Wind Data
13 MPH
Gust: 21 MPH
300° Northwest
Cloud Level(s): Few at 2600ft
Current Conditions at
EAST ST LOUIS - (KCPS)
37°
Feels like 28°F
Clear
as of 11:53 AM CST
Rel. Humidity: 51%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.42 in.
Flight Rule: VFR
Wind Data
16 MPH
310° Northwest
Cloud Level(s): Clear
Sunny on Thanksgiving Day Thanksgiving Day... Sunny, with a high near 42. West wind 10 to 14 mph, with gusts as high as 23 mph.

Clear on Tonight Tonight... Clear, with a low around 22. Northwest wind 5 to 7 mph.

Increasing Clouds on Friday Friday... Increasing clouds, with a high near 37. Light and variable wind becoming south around 5 mph in the afternoon.

90% chance of snow Friday Night Friday Night... Snow, mainly after 3am. Low around 30. Southeast wind 5 to 13 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.

100% chance of rain & snow Saturday Saturday... Snow before noon, then rain, possibly mixed with snow. High near 37. Southeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New snow accumulation of 2 to 4 inches possible.

70% chance of rain Saturday Night Saturday Night... Rain likely, mainly before midnight. Cloudy, with a low around 25. Chance of precipitation is 70%.

Mostly Cloudy on Sunday Sunday... Mostly cloudy, with a high near 31.

Mostly Cloudy on Sunday Night Sunday Night... Mostly cloudy, with a low around 16.

Mostly Cloudy on Monday Monday... Mostly cloudy, with a high near 27.

20% chance of snow Monday Night Monday Night... A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 16.

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.

Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 06:57 AM
Sunset: 4:40 PM
Civil Sunrise:06:28 AM
Civil Sunset: 5:09 PM
Nautical Sunrise: 05:55 AM
Nautical Sunset: 5:42 PM
Astro Sunrise: 05:23 AM
Astro Sunset: 6:14 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.