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Fairmont, Illinois Weather Forecast
Fairmont, Illinois Weather
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 3:16 pm CST Jan 19, 2026 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Tonight Tuesday Wednesday Thursday Friday Saturday Sunday Monday
Mostly Clear on Tonight Mostly Sunny on Tuesday Partly Sunny on Wednesday Mostly Sunny on Thursday Mostly Cloudy on Friday 30% chance of snow on Saturday Mostly Sunny on Sunday Sunny on Monday
Low: 13°F High: 37°F High: 44°F High: 37°F High: 17°F High: 13°F High: 23°F High: 34°F
Low: 30°F Low: 23°F Low: 10°F Low: 0°F Low: 4°F Low: 10°F  
Mostly Clear Mostly Sunny Partly Sunny Mostly Sunny Mostly Cloudy Snow Mostly Sunny Sunny
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Current Conditions at
ALTON - (KALN)
14°
Clear
as of 6:50 PM CST
Rel. Humidity: 40%
Dew Point: -6°F
Visibility: 10 Miles
Pressure: 30.41 in.
Flight Rule: VFR
Wind Data
3 MPH
280° West
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
16°
Clear
as of 6:54 PM CST
Rel. Humidity: 37%
Dew Point: -6°F
Visibility: 10 Miles
Pressure: 30.41 in.
Flight Rule: VFR
Wind Data
5 MPH
270° West
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
18°
Mostly Clear
as of 6:51 PM CST
Rel. Humidity: 34%
Dew Point: -6°F
Visibility: 10 Miles
Pressure: 30.40 in.
Flight Rule: VFR
Wind Data
6 MPH
280° West
Cloud Level(s): Few at 25000ft
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 13. West wind around 6 mph becoming light and variable in the evening.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 37. Light south wind increasing to 6 to 11 mph in the morning.
Increasing Clouds on Tuesday Night Tuesday Night... Increasing clouds, with a low around 30. South wind 10 to 13 mph, with gusts as high as 23 mph.
Partly Sunny on Wednesday Wednesday... Partly sunny, then gradually becoming sunny, with a high near 44. West wind 8 to 14 mph, with gusts as high as 21 mph.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 23. Southwest wind 7 to 9 mph becoming northwest after midnight.
Mostly Sunny on Thursday Thursday... Mostly sunny, with a high near 37.
Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 10.
Mostly Cloudy on Friday Friday... Mostly cloudy and cold, with a high near 17.
20% chance of snow Friday Night Friday Night... A 20 percent chance of snow. Mostly cloudy, with a low around 0.
30% chance of snow Saturday Saturday... A 30 percent chance of snow, mainly after noon. Mostly cloudy and cold, with a high near 13.
30% chance of snow Saturday Night Saturday Night... A 30 percent chance of snow. Partly cloudy, with a low around 4.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 23.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 10.
Sunny on Monday Monday... Sunny, with a high near 34.
Sun Almanac for Fairmont, Illinois
Sunrise: 07:16 AM
Sunset: 5:07 PM
Civil Sunrise:06:47 AM
Civil Sunset: 5:36 PM
Nautical Sunrise: 06:15 AM
Nautical Sunset: 6:09 PM
Astro Sunrise: 05:43 AM
Astro Sunset: 6:41 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.