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Fairmont, Illinois Weather Forecast
Fairmont, Illinois Weather
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 5:06 pm CST Dec 8, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Tonight Tuesday Wednesday Thursday Friday Saturday Sunday Monday
Increasing Clouds on Tonight Mostly Sunny on Tuesday Partly Sunny on Wednesday 20% chance of snow on Thursday Partly Sunny on Friday Partly Sunny on Saturday Mostly Sunny on Sunday 20% chance of rain on Monday
Low: 33 °F High: 51°F High: 46°F High: 38°F High: 34°F High: 23°F High: 28°F High: 37°F
Low: 38°F Low: 26°F Low: 25°F Low: 12°F Low: 13°F Low: 19°F  
Increasing Clouds Mostly Sunny Partly Sunny Snow Partly Sunny Partly Sunny Mostly Sunny Rain
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Current Conditions at
ALTON - (KALN)
30°
Clear
as of 4:50 PM CST
Rel. Humidity: 63%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 30.28 in.
Flight Rule: VFR
Wind Data
6 MPH
070° East
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
28°
Clear
as of 4:54 PM CST
Rel. Humidity: 74%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.26 in.
Flight Rule: VFR
Wind Data
6 MPH
100° East
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
30°
Mostly Cloudy
as of 4:51 PM CST
Rel. Humidity: 68%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.26 in.
Flight Rule: VFR
Wind Data
6 MPH
070° East
Cloud Level(s): Broken at 20000ft, Broken at 25000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
30°
Clear
as of 4:53 PM CST
Rel. Humidity: 74%
Dew Point: 23°F
Visibility: 10 Miles
Pressure: 30.27 in.
Flight Rule: VFR
Wind Data
6 MPH
060° Northeast
Cloud Level(s): Clear
Increasing Clouds on Tonight Tonight... Increasing clouds, with a temperature rising to around 33 by 5am. Southeast wind 5 to 9 mph becoming south after midnight.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 51. South wind 9 to 11 mph, with gusts as high as 23 mph.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 38. South wind 10 to 16 mph becoming west after midnight. Winds could gust as high as 33 mph.
Partly Sunny on Wednesday Wednesday... Partly sunny, with a high near 46. Breezy, with a northwest wind 14 to 24 mph, with gusts as high as 37 mph.
Mostly Cloudy on Wednesday Night Wednesday Night... Mostly cloudy, with a low around 26. Northwest wind 5 to 10 mph.
20% chance of snow Thursday Thursday... A 20 percent chance of snow. Mostly cloudy, with a high near 38.
20% chance of snow Thursday Night Thursday Night... A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 25.
Partly Sunny on Friday Friday... Partly sunny, with a high near 34.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 12.
Partly Sunny on Saturday Saturday... Partly sunny, with a high near 23.
Mostly Cloudy on Saturday Night Saturday Night... Mostly cloudy, with a low around 13.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 28.
Mostly Cloudy on Sunday Night Sunday Night... Mostly cloudy, with a low around 19.
20% chance of rain Monday Monday... A 20 percent chance of rain. Mostly cloudy, with a high near 37.
Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 07:07 AM
Sunset: 4:39 PM
Civil Sunrise:06:38 AM
Civil Sunset: 5:08 PM
Nautical Sunrise: 06:04 AM
Nautical Sunset: 5:42 PM
Astro Sunrise: 05:32 AM
Astro Sunset: 6:14 PM
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