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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: 10:31 pm CST Jan 9, 2026 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Tonight Saturday Sunday Monday Tuesday Wednesday Thursday Friday
50% chance of rain on Tonight 60% chance of rain on Saturday Sunny on Sunday Sunny on Monday Partly Sunny on Tuesday Mostly Cloudy on Wednesday Mostly Sunny on Thursday Mostly Cloudy on Friday
Low: 38°F High: 46°F High: 38°F High: 51°F High: 56°F High: 43°F High: 36°F High: 43°F
Low: 25°F Low: 27°F Low: 36°F Low: 37°F Low: 22°F Low: 26°F  
Rain Rain Sunny Sunny Partly Sunny Mostly Cloudy Mostly Sunny Mostly Cloudy
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Current Conditions at
ALTON - (KALN)
41°
Clear
as of 11:15 PM CST
Rel. Humidity: 86%
Dew Point: 37°F
Visibility: 10 Miles
Pressure: 30.11 in.
Flight Rule: VFR
Wind Data
5 MPH
110° East
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
36°
Clear
as of 10:54 PM CST
Rel. Humidity: 100%
Dew Point: 36°F
Visibility: 10 Miles
Pressure: 30.11 in.
Flight Rule: VFR
Wind Data
3 MPH
040° Northeast
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
43°
Feels like 37°F
Mostly Cloudy
as of 10:51 PM CST
Rel. Humidity: 81%
Dew Point: 37°F
Visibility: 10 Miles
Pressure: 30.11 in.
Flight Rule: VFR
Wind Data
9 MPH
120° Southeast
Cloud Level(s): Few at 16000ft, Broken at 25000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
43°
Clear
as of 10:53 PM CST
Rel. Humidity: 81%
Dew Point: 37°F
Visibility: 10 Miles
Pressure: 30.11 in.
Flight Rule: VFR
Wind Data
5 MPH
130° Southeast
Cloud Level(s): Clear
50% chance of rain Tonight Tonight... A 50 percent chance of rain, mainly after 3am. Mostly cloudy, with a low around 38. Light and variable wind becoming northwest 5 to 7 mph after midnight.
60% chance of rain Saturday Saturday... Rain likely, mainly before 10am. Cloudy through mid morning, then gradual clearing, with a high near 46. Northwest wind 9 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
20% chance of rain & snow Saturday Night Saturday Night... A slight chance of rain before 9pm, then a slight chance of snow between 9pm and 10pm. Partly cloudy, with a low around 25. Northwest wind 11 to 15 mph, with gusts as high as 29 mph. Chance of precipitation is 20%.
Sunny on Sunday Sunday... Sunny, with a high near 38. Northwest wind 7 to 15 mph, with gusts as high as 24 mph.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 27. Southwest wind 3 to 7 mph.
Sunny on Monday Monday... Sunny, with a high near 51.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 36.
Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 56.
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.
Mostly Cloudy on Wednesday Night Wednesday Night... Mostly cloudy, with a low around 22.
Mostly Sunny on Thursday Thursday... Mostly sunny, with a high near 36.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 26.
Mostly Cloudy on Friday Friday... Mostly cloudy, with a high near 43.
Current Radar Image


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.