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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: 8:01 am CST Dec 14, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Monday Tuesday Wednesday Thursday Friday Saturday
Sunny on This Afternoon Clear on Tonight Sunny on Monday Sunny on Tuesday Mostly Sunny on Wednesday 50% chance of rain on Thursday Mostly Sunny on Friday 20% chance of rain on Saturday
High: 14°F Low: 9 °F High: 41°F High: 50°F High: 53°F High: 58°F High: 40°F High: 56°F
Low: 27°F Low: 35°F Low: 43°F Low: 23°F Low: 33°F  
Sunny Clear Sunny Sunny Mostly Sunny Rain Mostly Sunny Rain
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Current Conditions at
ALTON - (KALN)
12°
Clear
as of 11:50 AM CST
Rel. Humidity: 47%
Dew Point: -4°F
Visibility: 10 Miles
Pressure: 30.74 in.
Flight Rule: VFR
Wind Data
8 MPH
320° Northwest
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
14°
Clear
as of 11:54 AM CST
Rel. Humidity: 47%
Dew Point: -2°F
Visibility: 10 Miles
Pressure: 30.73 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
12°
Mostly Clear
as of 11:51 AM CST
Rel. Humidity: 51%
Dew Point: -2°F
Visibility: 10 Miles
Pressure: 30.72 in.
Flight Rule: VFR
Wind Data
7 MPH
330° Northwest
Cloud Level(s): Few at 25000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
12°
Clear
as of 11:53 AM CST
Rel. Humidity: 51%
Dew Point: -2°F
Visibility: 10 Miles
Pressure: 30.73 in.
Flight Rule: VFR
Wind Data
7 MPH
350° North
Cloud Level(s): Clear
Sunny on This Afternoon This Afternoon... Sunny and cold, with a high near 14. North wind 5 to 9 mph.
Clear on Tonight Tonight... Clear, with a low around 9. Light and variable wind becoming south 5 to 8 mph in the evening.
Sunny on Monday Monday... Sunny, with a high near 41. Southwest wind 7 to 14 mph, with gusts as high as 22 mph.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 27. Southwest wind around 6 mph.
Sunny on Tuesday Tuesday... Sunny, with a high near 50. South wind 5 to 9 mph.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 35.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 53.
20% chance of thunderstorms Wednesday Night Wednesday Night... A 20 percent chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 43.
50% chance of rain Thursday Thursday... A 50 percent chance of rain before noon. Partly sunny, with a high near 58.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 23.
Mostly Sunny on Friday Friday... Mostly sunny, with a high near 40.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 33.
20% chance of rain Saturday Saturday... A 20 percent chance of rain. Partly sunny, with a high near 56.
Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 07:12 AM
Sunset: 4:40 PM
Civil Sunrise:06:42 AM
Civil Sunset: 5:09 PM
Nautical Sunrise: 06:09 AM
Nautical Sunset: 5:43 PM
Astro Sunrise: 05:36 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.