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Fairmont, Illinois Weather Forecast
Fairmont, Illinois Weather
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 10:57 am CST Jan 21, 2026 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Thursday Friday Saturday Sunday Monday Tuesday
Sunny on This Afternoon Cloudy on Tonight Partly Sunny on Thursday Mostly Cloudy on Friday 50% chance of snow on Saturday 20% chance of snow on Sunday Sunny on Monday Mostly Sunny on Tuesday
High: 45°F Low: 23°F High: 38°F High: 14°F High: 13°F High: 20°F High: 23°F High: 35°F
Low: 7 °F Low: 1°F Low: 7°F Low: 4°F Low: 10°F  
Sunny Cloudy Partly Sunny Mostly Cloudy Snow Snow Sunny Mostly Sunny
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Current Conditions at
ALTON - (KALN)
45°
Feels like 36°F
Clear
as of 11:50 AM CST
Rel. Humidity: 39%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.06 in.
Flight Rule: VFR
Wind Data
18 MPH
Gust: 25 MPH
280° West
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
45°
Feels like 36°F
Clear
as of 11:54 AM CST
Rel. Humidity: 39%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.07 in.
Flight Rule: VFR
Wind Data
18 MPH
Gust: 26 MPH
280° West
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
46°
Feels like 40°F
Mostly Clear
as of 11:51 AM CST
Rel. Humidity: 36%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.07 in.
Flight Rule: VFR
Wind Data
14 MPH
250° West
Cloud Level(s): Few at 25000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
48°
Feels like 43°F
Clear
as of 11:53 AM CST
Rel. Humidity: 34%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.07 in.
Flight Rule: VFR
Wind Data
12 MPH
Gust: 18 MPH
240° Southwest
Cloud Level(s): Clear
Sunny on This Afternoon This Afternoon... Sunny, with a high near 45. West wind 11 to 15 mph, with gusts as high as 24 mph.
Cloudy on Tonight Tonight... Partly cloudy, with a low around 23. Southwest wind 5 to 13 mph becoming northwest in the evening. Winds could gust as high as 23 mph.
Partly Sunny on Thursday Thursday... Partly sunny, with a high near 38. West wind 3 to 7 mph.
Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 7. Light and variable wind becoming north 10 to 15 mph in the evening. Winds could gust as high as 24 mph.
Mostly Cloudy on Friday Friday... Mostly cloudy and cold, with a high near 14. North wind 13 to 16 mph, with gusts as high as 23 mph.
Cloudy on Friday Night Friday Night... Cloudy, with a low around 1.
50% chance of snow Saturday Saturday... A 50 percent chance of snow, mainly after noon. Cloudy and cold, with a high near 13.
50% chance of snow Saturday Night Saturday Night... A 50 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 7.
20% chance of snow Sunday Sunday... A 20 percent chance of snow before noon. Partly sunny and cold, with a high near 20.
Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around 4.
Sunny on Monday Monday... Sunny, with a high near 23.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 10.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 35.
Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 07:15 AM
Sunset: 5:09 PM
Civil Sunrise:06:46 AM
Civil Sunset: 5:38 PM
Nautical Sunrise: 06:14 AM
Nautical Sunset: 6:11 PM
Astro Sunrise: 05:42 AM
Astro Sunset: 6:43 PM
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