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Fairmont, Illinois Weather Forecast
Fairmont, Illinois Weather
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Click for Hazardous Weather Outlook for Fairmont, Illinois
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 8:46 pm CST Dec 11, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Tonight Friday Saturday Sunday Monday Tuesday Wednesday Thursday
Mostly Cloudy on Tonight Cloudy on Friday 50% chance of snow on Saturday Sunny on Sunday Sunny on Monday Mostly Sunny on Tuesday Mostly Cloudy on Wednesday 20% chance of rain on Thursday
Low: 29°F High: 36°F High: 23°F High: 12°F High: 37°F High: 48°F High: 55°F High: 53°F
Low: 21°F Low: 2 °F Low: 6°F Low: 25°F Low: 36°F Low: 42°F  
Mostly Cloudy Cloudy Snow Sunny Sunny Mostly Sunny Mostly Cloudy Rain
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Current Conditions at
ALTON - (KALN)
34°
Feels like 25°F
Cloudy
as of 10:55 PM CST
Rel. Humidity: 86%
Dew Point: 30°F
Visibility: 10 Miles
Pressure: 29.93 in.
Flight Rule: VFR
Wind Data
10 MPH
100° East
Cloud Level(s): Solid Overcast at 7000ft
Current Conditions at
ST CHARLES - (KSET)
34°
Feels like 26°F
Cloudy
as of 10:54 PM CST
Rel. Humidity: 80%
Dew Point: 28°F
Visibility: 10 Miles
Pressure: 29.92 in.
Flight Rule: VFR
Wind Data
9 MPH
090° East
Cloud Level(s): Solid Overcast at 7500ft
Current Conditions at
ST LOUIS - (KSTL)
34°
Feels like 23°F
Cloudy
as of 10:51 PM CST
Rel. Humidity: 80%
Dew Point: 28°F
Visibility: 10 Miles
Pressure: 29.91 in.
Flight Rule: VFR
Wind Data
15 MPH
110° East
Cloud Level(s): Broken at 7500ft, Solid Overcast at 9500ft
Current Conditions at
EAST ST LOUIS - (KCPS)
34°
Cloudy
as of 10:53 PM CST
Rel. Humidity: 80%
Dew Point: 28°F
Visibility: 10 Miles
Pressure: 29.92 in.
Flight Rule: VFR
Wind Data
7 MPH
100° East
Cloud Level(s): Solid Overcast at 7000ft
Mostly Cloudy on Tonight Tonight... Mostly cloudy, with a low around 29. East wind 7 to 9 mph becoming northeast after midnight.
Cloudy on Friday Friday... Cloudy, with a high near 36. Northwest wind around 9 mph.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 21. Northwest wind around 7 mph.
50% chance of snow Saturday Saturday... A 50 percent chance of snow, mainly after noon. Cloudy, with a high near 23. North wind 6 to 10 mph.
Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 2. North wind around 11 mph.
Sunny on Sunday Sunday... Sunny and cold, with a high near 12.
Clear on Sunday Night Sunday Night... Clear, with a low around 6.
Sunny on Monday Monday... Sunny, with a high near 37.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 25.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 48.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 36.
Mostly Cloudy on Wednesday Wednesday... Mostly cloudy, with a high near 55.
20% chance of rain Wednesday Night Wednesday Night... A 20 percent chance of rain. Mostly cloudy, with a low around 42.
20% chance of rain Thursday Thursday... A 20 percent chance of rain. Partly sunny, with a high near 53.
Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 07:11 AM
Sunset: 4:39 PM
Civil Sunrise:06:41 AM
Civil Sunset: 5:09 PM
Nautical Sunrise: 06:07 AM
Nautical Sunset: 5:42 PM
Astro Sunrise: 05:35 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.