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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 am CST Dec 11, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Overnight Thursday Friday Saturday Sunday Monday Tuesday Wednesday
Mostly Cloudy on Overnight 30% chance of snow on Thursday Mostly Cloudy on Friday 50% chance of snow on Saturday Sunny on Sunday Sunny on Monday Mostly Sunny on Tuesday Mostly Cloudy on Wednesday
Low: 25°F High: 35°F High: 38°F High: 26°F High: 14°F High: 39°F High: 44°F High: 51°F
Low: 30°F Low: 21°F Low: 0°F Low: 4°F Low: 24°F Low: 35°F  
Mostly Cloudy Snow Mostly Cloudy Snow Sunny Sunny Mostly Sunny Mostly Cloudy
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Current Conditions at
ALTON - (KALN)
32°
Cloudy
as of 3:15 AM CST
Rel. Humidity: 63%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.05 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 2800ft
Current Conditions at
ST CHARLES - (KSET)
30°
Cloudy
as of 2:54 AM CST
Rel. Humidity: 68%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.05 in.
Flight Rule: MVFR
Wind Data
6 MPH
330° Northwest
Cloud Level(s): Solid Overcast at 2900ft
Current Conditions at
ST LOUIS - (KSTL)
30°
Mostly Cloudy
as of 2:51 AM CST
Rel. Humidity: 80%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 30.05 in.
Flight Rule: MVFR
Wind Data
5 MPH
300° Northwest
Cloud Level(s): Broken at 2600ft
Current Conditions at
EAST ST LOUIS - (KCPS)
32°
Cloudy
as of 2:53 AM CST
Rel. Humidity: 74%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 30.06 in.
Flight Rule: MVFR
Wind Data
5 MPH
310° Northwest
Cloud Level(s): Solid Overcast at 2900ft
Mostly Cloudy on Overnight Overnight... Mostly cloudy, with a low around 25. Northwest wind 5 to 7 mph.
30% chance of snow Thursday Thursday... A 30 percent chance of snow, mainly between 3pm and 4pm. Mostly cloudy, with a high near 35. Light and variable wind becoming southeast 5 to 9 mph in the morning.
20% chance of snow Thursday Night Thursday Night... A 20 percent chance of snow before 7pm. Mostly cloudy, with a low around 30. Southeast wind 6 to 9 mph becoming north after midnight.
Mostly Cloudy on Friday Friday... Mostly cloudy, with a high near 38. Northwest wind 8 to 11 mph, with gusts as high as 20 mph.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 21. Northwest wind 6 to 8 mph.
50% chance of snow Saturday Saturday... A 50 percent chance of snow. Cloudy, with a high near 26.
Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 0.
Sunny on Sunday Sunday... Sunny and cold, with a high near 14.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 4.
Sunny on Monday Monday... Sunny, with a high near 39.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 24.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 44.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 35.
Mostly Cloudy on Wednesday Wednesday... Mostly cloudy, with a high near 51.
Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 07:10 AM
Sunset: 4:39 PM
Civil Sunrise:06:40 AM
Civil Sunset: 5:09 PM
Nautical Sunrise: 06:07 AM
Nautical Sunset: 5:42 PM
Astro Sunrise: 05:34 AM
Astro Sunset: 6:15 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.