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Fairmont, Illinois Weather Forecast
Fairmont, Illinois Weather
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 8:26 am CST Dec 26, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Saturday Sunday Monday Tuesday Wednesday New Year's Day
Mostly Cloudy on Today Mostly Cloudy on Tonight Mostly Cloudy on Saturday 90% chance of thunderstorms on Sunday Mostly Sunny on Monday Sunny on Tuesday Mostly Sunny on Wednesday Partly Sunny on New Year's Day
High: 63°F Low: 45°F High: 66°F High: 70°F High: 29°F High: 37°F High: 40°F High: 35°F
Low: 60°F Low: 21°F Low: 19°F Low: 26°F Low: 22°F  
Mostly Cloudy Mostly Cloudy Mostly Cloudy Thunderstorms Mostly Sunny Sunny Mostly Sunny Partly Sunny
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Current Conditions at
ALTON - (KALN)
64°
Mostly Cloudy
as of 9:55 AM CST
Rel. Humidity: 82%
Dew Point: 59°F
Visibility: 10 Miles
Pressure: 29.78 in.
Flight Rule: MVFR
Wind Data
12 MPH
260° West
Cloud Level(s): Broken at 2100ft
Current Conditions at
ST CHARLES - (KSET)
63°
Cloudy
as of 9:54 AM CST
Rel. Humidity: 88%
Dew Point: 59°F
Visibility: 10 Miles
Pressure: 29.77 in.
Flight Rule: MVFR
Wind Data
3 MPH
300° Northwest
Cloud Level(s): Solid Overcast at 2200ft
Current Conditions at
ST LOUIS - (KSTL)
64°
Mostly Cloudy
as of 9:51 AM CST
Rel. Humidity: 82%
Dew Point: 59°F
Visibility: 10 Miles
Pressure: 29.79 in.
Flight Rule: MVFR
Wind Data
14 MPH
260° West
Cloud Level(s): Broken at 1600ft, Broken at 25000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
66°
Mostly Cloudy
as of 9:53 AM CST
Rel. Humidity: 77%
Dew Point: 59°F
Visibility: 10 Miles
Pressure: 29.78 in.
Flight Rule: MVFR
Wind Data
7 MPH
250° West
Cloud Level(s): Broken at 2000ft
Mostly Cloudy on Today Today... Mostly cloudy, with a high near 63. West wind 6 to 10 mph.
Mostly Cloudy on Tonight Tonight... Mostly cloudy, with a low around 45. Northwest wind around 5 mph becoming calm.
Mostly Cloudy on Saturday Saturday... Mostly cloudy, with a high near 66. Southeast wind 6 to 11 mph.
30% chance of rain Saturday Night Saturday Night... A 30 percent chance of rain, mainly after midnight. Cloudy, with a low around 60. South wind 7 to 10 mph.
90% chance of thunderstorms Sunday Sunday... Rain and possibly a thunderstorm. High near 70. South wind 7 to 15 mph becoming west in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%.
50% chance of rain & snow Sunday Night Sunday Night... A chance of rain, mixing with snow after 9pm, then gradually ending. Mostly cloudy, with a low around 21. Blustery. Chance of precipitation is 50%.
Mostly Sunny on Monday Monday... Mostly sunny, with a high near 29. Blustery.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 19.
Sunny on Tuesday Tuesday... Sunny, with a high near 37.
Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 26.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 40.
Mostly Cloudy on Wednesday Night Wednesday Night... Mostly cloudy, with a low around 22.
Partly Sunny on New Year's Day New Year's Day... Partly sunny, with a high near 35.
Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 07:18 AM
Sunset: 4:45 PM
Civil Sunrise:06:48 AM
Civil Sunset: 5:15 PM
Nautical Sunrise: 06:15 AM
Nautical Sunset: 5:49 PM
Astro Sunrise: 05:42 AM
Astro Sunset: 6:21 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.