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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: 4:41 pm CST Jan 10, 2026 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Tonight Sunday Monday Tuesday Wednesday Thursday Friday Saturday
50% chance of rain & snow on Tonight Sunny on Sunday Sunny on Monday Partly Sunny on Tuesday Mostly Cloudy on Wednesday Mostly Sunny on Thursday Partly Sunny on Friday Partly Sunny on Saturday
Low: 27°F High: 39°F High: 51°F High: 58°F High: 43°F High: 38°F High: 43°F High: 34°F
Low: 28°F Low: 36°F Low: 37°F Low: 21°F Low: 30°F Low: 24°F  
Rain & Snow Sunny Sunny Partly Sunny Mostly Cloudy Mostly Sunny Partly Sunny Partly Sunny
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Current Conditions at
ALTON - (KALN)
41°
Feels like 34°F
Clear
as of 5:50 PM CST
Rel. Humidity: 52%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 30.11 in.
Flight Rule: VFR
Wind Data
10 MPH
240° Southwest
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
43°
Feels like 37°F
Partly Cloudy
as of 5:54 PM CST
Rel. Humidity: 41%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.11 in.
Flight Rule: VFR
Wind Data
9 MPH
240° Southwest
Cloud Level(s): Scattered at 8500ft
Current Conditions at
ST LOUIS - (KSTL)
43°
Feels like 36°F
Mostly Clear
as of 5:51 PM CST
Rel. Humidity: 41%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.12 in.
Flight Rule: VFR
Wind Data
12 MPH
250° West
Cloud Level(s): Few at 5000ft, Few at 25000ft
50% chance of rain & snow Tonight Tonight... A chance of rain and snow showers before midnight, then a chance of flurries between midnight and 5am. Mostly cloudy, then gradually becoming mostly clear, with a low around 27. Northwest wind 9 to 17 mph, with gusts as high as 36 mph. Chance of precipitation is 50%.
Sunny on Sunday Sunday... Sunny, with a high near 39. Northwest wind 7 to 15 mph, with gusts as high as 31 mph.
Clear on Sunday Night Sunday Night... Clear, with a low around 28. Southwest wind 5 to 7 mph.
Sunny on Monday Monday... Sunny, with a high near 51. West wind 7 to 10 mph.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 36. Southwest wind 6 to 9 mph.
Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 58.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 37.
Mostly Cloudy on Wednesday Wednesday... Mostly cloudy, with a high near 43.
Cloudy on Wednesday Night Wednesday Night... Partly cloudy, with a low around 21.
Mostly Sunny on Thursday Thursday... Mostly sunny, with a high near 38.
Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 30.
Partly Sunny on Friday Friday... Partly sunny, with a high near 43.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 24.
Partly Sunny on Saturday Saturday... Partly sunny, with a high near 34.
Sun Almanac for Fairmont, Illinois
Sunrise: 07:19 AM
Sunset: 4:58 PM
Civil Sunrise:06:50 AM
Civil Sunset: 5:27 PM
Nautical Sunrise: 06:17 AM
Nautical Sunset: 6:00 PM
Astro Sunrise: 05:45 AM
Astro Sunset: 6:32 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.