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Fairmont, Illinois Weather Forecast
Fairmont, Illinois Weather
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 4:21 am CST Dec 10, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

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Today Tonight Thursday Friday Saturday Sunday Monday Tuesday
20% chance of rain on Today Mostly Cloudy on Tonight Increasing Clouds on Thursday Partly Sunny on Friday 20% chance of snow on Saturday Sunny on Sunday Mostly Sunny on Monday Partly Sunny on Tuesday
High: 34 °F Low: 24°F High: 39°F High: 39°F High: 31°F High: 22°F High: 36°F High: 45°F
Low: 32°F Low: 20°F Low: 7°F Low: 11°F Low: 27°F  
Rain Mostly Cloudy Increasing Clouds Partly Sunny Snow Sunny Mostly Sunny Partly Sunny
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Current Conditions at
ALTON - (KALN)
48°
Feels like 41°F
Cloudy
as of 5:55 AM CST
Rel. Humidity: 61%
Dew Point: 36°F
Visibility: 10 Miles
Pressure: 29.60 in.
Flight Rule: VFR
Wind Data
18 MPH
Gust: 31 MPH
300° Northwest
Cloud Level(s): Broken at 3500ft, Solid Overcast at 4200ft
Current Conditions at
ST CHARLES - (KSET)
46°
Feels like 37°F
Mostly Cloudy
as of 5:54 AM CST
Rel. Humidity: 65%
Dew Point: 36°F
Visibility: 10 Miles
Pressure: 29.61 in.
Flight Rule: VFR
Wind Data
26 MPH
Gust: 38 MPH
300° Northwest
Cloud Level(s): Scattered at 3700ft, Broken at 4600ft
Current Conditions at
ST LOUIS - (KSTL)
48°
Feels like 42°F
Mostly Cloudy
as of 5:51 AM CST
Rel. Humidity: 61%
Dew Point: 36°F
Visibility: 10 Miles
Pressure: 29.61 in.
Flight Rule: VFR
Wind Data
16 MPH
Gust: 30 MPH
300° Northwest
Cloud Level(s): Few at 3700ft, Few at 4500ft, Broken at 15000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
52°
Partly Cloudy
as of 5:53 AM CST
Rel. Humidity: 53%
Dew Point: 36°F
Visibility: 10 Miles
Pressure: 29.60 in.
Flight Rule: VFR
Wind Data
22 MPH
Gust: 32 MPH
300° Northwest
Cloud Level(s): Scattered at 4600ft
20% chance of rain Today Today... A slight chance of rain before 7am, then a chance of sprinkles between 7am and 11am. Mostly cloudy, with a temperature falling to around 34 by 5pm. Breezy, with a northwest wind 14 to 23 mph, with gusts as high as 46 mph. Chance of precipitation is 20%.

Mostly Cloudy on Tonight Tonight... Mostly cloudy, with a low around 24. Northwest wind 6 to 11 mph becoming light after midnight.

Increasing Clouds on Thursday Thursday... Increasing clouds, with a high near 39. Light and variable wind becoming southeast 5 to 8 mph in the morning.

20% chance of snow Thursday Night Thursday Night... A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 32. Southeast wind around 8 mph becoming west after midnight.

Partly Sunny on Friday Friday... Partly sunny, with a high near 39. Northwest wind 8 to 14 mph, with gusts as high as 21 mph.

Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 20.

20% chance of snow Saturday Saturday... A 20 percent chance of snow after noon. Mostly cloudy, with a high near 31.

Mostly Cloudy on Saturday Night Saturday Night... Mostly cloudy, with a low around 7.

Sunny on Sunday Sunday... Sunny, with a high near 22.

Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 11.

Mostly Sunny on Monday Monday... Mostly sunny, with a high near 36.

Mostly Cloudy on Monday Night Monday Night... Mostly cloudy, with a low around 27.

Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 45.

Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 07:09 AM
Sunset: 4:39 PM
Civil Sunrise:06:39 AM
Civil Sunset: 5:09 PM
Nautical Sunrise: 06:06 AM
Nautical Sunset: 5:42 PM
Astro Sunrise: 05:33 AM
Astro Sunset: 6:14 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.