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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 Jan 4, 2026 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Monday Tuesday Wednesday Thursday Friday Saturday
Partly Sunny on Today Mostly Cloudy on Tonight Sunny on Monday Mostly Sunny on Tuesday Mostly Sunny on Wednesday 50% chance of rain on Thursday 30% chance of rain on Friday Mostly Sunny on Saturday
High: 44°F Low: 32°F High: 57°F High: 61°F High: 60°F High: 59°F High: 54°F High: 45°F
Low: 45°F Low: 38°F Low: 45°F Low: 43°F Low: 33°F  
Partly Sunny Mostly Cloudy Sunny Mostly Sunny Mostly Sunny Rain Rain Mostly Sunny
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Current Conditions at
ALTON - (KALN)
23°
Clear
as of 3:55 AM CST
Rel. Humidity: 85%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 30.15 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
Clear
as of 3:54 AM CST
Pressure: 30.15 in.
Wind Data
Calm
Current Conditions at
ST LOUIS - (KSTL)
27°
Clear
as of 3:51 AM CST
Rel. Humidity: 73%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 30.15 in.
Flight Rule: VFR
Wind Data
3 MPH
230° Southwest
Cloud Level(s): Clear
Current Conditions at
EAST ST LOUIS - (KCPS)
21°
Clear
as of 3:53 AM CST
Rel. Humidity: 92%
Dew Point: 19°F
Visibility: 9 Miles
Pressure: 30.15 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Partly Sunny on Today Today... Partly sunny, with a high near 44. Calm wind becoming south 5 to 9 mph in the morning.
Mostly Cloudy on Tonight Tonight... Mostly cloudy, then gradually becoming clear, with a low around 32. South wind 5 to 9 mph.
Sunny on Monday Monday... Sunny, with a high near 57. South wind 6 to 8 mph.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 45. South wind 6 to 8 mph.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 61. South wind 6 to 10 mph becoming west in the afternoon.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 38.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 60.
20% chance of rain Wednesday Night Wednesday Night... A 20 percent chance of rain after midnight. Partly cloudy, with a low around 45.
50% chance of rain Thursday Thursday... A 50 percent chance of rain. Mostly cloudy, with a high near 59.
50% chance of rain Thursday Night Thursday Night... A 50 percent chance of rain. Mostly cloudy, with a low around 43.
30% chance of rain Friday Friday... A 30 percent chance of rain. Mostly cloudy, with a high near 54.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 33.
Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 45.
Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 07:20 AM
Sunset: 4:52 PM
Civil Sunrise:06:50 AM
Civil Sunset: 5:22 PM
Nautical Sunrise: 06:17 AM
Nautical Sunset: 5:55 PM
Astro Sunrise: 05:44 AM
Astro Sunset: 6:27 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.