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Fairmont, Illinois Weather Forecast
Fairmont, Illinois Weather
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 9:51 pm CST Jan 21, 2026 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Tonight Thursday Friday Saturday Sunday Monday Tuesday Wednesday
Cloudy on Tonight Partly Sunny on Thursday Mostly Cloudy on Friday 60% chance of snow on Saturday 40% chance of snow on Sunday Sunny on Monday Mostly Sunny on Tuesday Partly Sunny on Wednesday
Low: 24°F High: 38°F High: 14°F High: 15°F High: 19°F High: 16°F High: 29°F High: 25°F
Low: 10°F Low: 3 °F Low: 9 °F Low: -2°F Low: 3°F Low: 13°F  
Cloudy Partly Sunny Mostly Cloudy Snow Snow Sunny Mostly Sunny Partly Sunny
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Current Conditions at
ALTON - (KALN)
39°
Feels like 30°F
Clear
as of 9:50 PM CST
Rel. Humidity: 41%
Dew Point: 18°F
Visibility: 10 Miles
Pressure: 30.16 in.
Flight Rule: VFR
Wind Data
17 MPH
Gust: 24 MPH
280° West
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
36°
Feels like 25°F
Clear
as of 9:54 PM CST
Rel. Humidity: 47%
Dew Point: 18°F
Visibility: 10 Miles
Pressure: 30.19 in.
Flight Rule: VFR
Wind Data
18 MPH
Gust: 25 MPH
300° Northwest
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
39°
Feels like 30°F
Clear
as of 9:51 PM CST
Rel. Humidity: 38%
Dew Point: 16°F
Visibility: 10 Miles
Pressure: 30.18 in.
Flight Rule: VFR
Wind Data
17 MPH
Gust: 26 MPH
300° Northwest
Cloud Level(s): Clear
Current Conditions at
EAST ST LOUIS - (KCPS)
43°
Feels like 35°F
Clear
as of 9:53 PM CST
Rel. Humidity: 35%
Dew Point: 18°F
Visibility: 10 Miles
Pressure: 30.18 in.
Flight Rule: VFR
Wind Data
16 MPH
Gust: 28 MPH
290° West
Cloud Level(s): Clear
Cloudy on Tonight Tonight... Partly cloudy, with a low around 24. Northwest wind 5 to 11 mph, with gusts as high as 28 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 10. Light and variable wind becoming north 11 to 16 mph in the evening. Winds could gust as high as 23 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.

30% chance of snow Friday Night Friday Night... A 30 percent chance of snow after midnight. Cloudy, with a low around 3. North wind around 11 mph.

60% chance of snow Saturday Saturday... Snow likely, mainly after noon. Cloudy and cold, with a high near 15. Chance of precipitation is 60%. New snow accumulation of around an inch possible.

80% chance of snow Saturday Night Saturday Night... Snow. Low around 9. Chance of precipitation is 80%.

40% chance of snow Sunday Sunday... A 40 percent chance of snow, mainly before noon. Partly sunny and cold, with a high near 19.

Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around -2.

Sunny on Monday Monday... Sunny and cold, with a high near 16.

Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 3.

Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 29.

Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 13.

Partly Sunny on Wednesday Wednesday... Partly sunny, with a high near 25.

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
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.