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Fairmont, Illinois Weather Forecast
Fairmont, Illinois Weather
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 5:11 pm CST Dec 30, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Tonight Wednesday New Year's Day Friday Saturday Sunday Monday Tuesday
Mostly Clear on Tonight Cloudy on Wednesday Partly Sunny on New Year's Day Mostly Cloudy on Friday Mostly Sunny on Saturday Mostly Sunny on Sunday Partly Sunny on Monday Sunny on Tuesday
Low: 27°F High: 43°F High: 37°F High: 41°F High: 39°F High: 48°F High: 50°F High: 47°F
Low: 25°F Low: 28°F Low: 25°F Low: 26°F Low: 34°F Low: 31°F  
Mostly Clear Cloudy Partly Sunny Mostly Cloudy Mostly Sunny Mostly Sunny Partly Sunny Sunny
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Current Conditions at
ALTON - (KALN)
30°
Clear
as of 7:50 PM CST
Rel. Humidity: 50%
Dew Point: 14°F
Visibility: 10 Miles
Pressure: 30.16 in.
Flight Rule: VFR
Wind Data
8 MPH
220° Southwest
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
27°
Clear
as of 7:54 PM CST
Rel. Humidity: 53%
Dew Point: 12°F
Visibility: 10 Miles
Pressure: 30.16 in.
Flight Rule: VFR
Wind Data
3 MPH
210° Southwest
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
30°
Partly Cloudy
as of 7:51 PM CST
Rel. Humidity: 46%
Dew Point: 12°F
Visibility: 10 Miles
Pressure: 30.16 in.
Flight Rule: VFR
Wind Data
3 MPH
240° Southwest
Cloud Level(s): Few at 9000ft, Scattered at 25000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
32°
Clear
as of 7:53 PM CST
Rel. Humidity: 43%
Dew Point: 12°F
Visibility: 10 Miles
Pressure: 30.17 in.
Flight Rule: VFR
Wind Data
7 MPH
220° Southwest
Cloud Level(s): Clear
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 27. West wind 7 to 9 mph.
Cloudy on Wednesday Wednesday... Mostly sunny through mid morning, then becoming cloudy, with a high near 43. West wind 7 to 11 mph, with gusts as high as 20 mph.
Cloudy on Wednesday Night Wednesday Night... Partly cloudy, with a low around 25. West wind 5 to 7 mph becoming northeast after midnight.
Partly Sunny on New Year's Day New Year's Day... Partly sunny, with a high near 37. Northeast wind around 5 mph becoming light and variable in the afternoon.
Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 28. Light southeast wind.
Mostly Cloudy on Friday Friday... Mostly cloudy, with a high near 41.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 25.
Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 39.
Mostly Clear on Saturday Night Saturday Night... Mostly clear, with a low around 26.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 48.
Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around 34.
Partly Sunny on Monday Monday... Partly sunny, with a high near 50.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 31.
Sunny on Tuesday Tuesday... Sunny, with a high near 47.
Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 07:19 AM
Sunset: 4:48 PM
Civil Sunrise:06:49 AM
Civil Sunset: 5:18 PM
Nautical Sunrise: 06:16 AM
Nautical Sunset: 5:51 PM
Astro Sunrise: 05:44 AM
Astro Sunset: 6:24 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.