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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: 10:26 pm CST Dec 25, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Overnight Friday Saturday Sunday Monday Tuesday Wednesday New Year's Day
Cloudy on Overnight Partly Sunny on Friday Partly Sunny on Saturday 80% chance of thunderstorms on Sunday Sunny on Monday Sunny on Tuesday Mostly Sunny on Wednesday Sunny on New Year's Day
Low: 56°F High: 66°F High: 67°F High: 70°F High: 28°F High: 36°F High: 40°F High: 38°F
Low: 45°F Low: 59°F Low: 21°F Low: 18°F Low: 25°F Low: 24°F  
Cloudy Partly Sunny Partly Sunny Thunderstorms Sunny Sunny Mostly Sunny Sunny
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Current Conditions at
ALTON - (KALN)
61°
Cloudy
as of 12:35 AM CST
Rel. Humidity: 93%
Dew Point: 59°F
Visibility: 7 Miles
Pressure: 29.78 in.
Flight Rule: MVFR
Wind Data
8 MPH
170° South
Cloud Level(s): Solid Overcast at 1400ft
Current Conditions at
ST CHARLES - (KSET)
52°
Cloudy
Fog
as of 12:01 AM CST
Rel. Humidity: 100%
Dew Point: 52°F
Visibility: 1/4 Miles
Pressure: 29.77 in.
Flight Rule: IFR
Wind Data
5 MPH
100° East
Current Conditions at
ST LOUIS - (KSTL)
57°
Mostly Cloudy
as of 11:51 PM CST
Rel. Humidity: 100%
Dew Point: 57°F
Visibility: 7 Miles
Pressure: 29.80 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Few at 1300ft, Broken at 24000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
59°
Clear
Mist
as of 11:53 PM CST
Rel. Humidity: 93%
Dew Point: 57°F
Visibility: 6 Miles
Pressure: 29.79 in.
Flight Rule: VFR
Wind Data
7 MPH
170° South
Cloud Level(s): Clear
Cloudy on Overnight Overnight... Partly cloudy, with a low around 56. South wind around 7 mph.
Partly Sunny on Friday Friday... Partly sunny, with a high near 66. Southwest wind 7 to 11 mph becoming northwest in the afternoon.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 45. Northwest wind around 6 mph becoming light and variable.
Partly Sunny on Saturday Saturday... Partly sunny, with a high near 67. Southeast wind 6 to 10 mph.
40% chance of rain Saturday Night Saturday Night... A 40 percent chance of rain after midnight. Cloudy, with a low around 59. South wind 7 to 10 mph.
80% chance of thunderstorms Sunday Sunday... Showers and possibly a thunderstorm. High near 70. Chance of precipitation is 80%.
50% chance of rain & snow Sunday Night Sunday Night... A chance of rain and snow before midnight. Mostly cloudy, with a low around 21. Blustery. Chance of precipitation is 50%.
Sunny on Monday Monday... Sunny, with a high near 28. Blustery.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 18.
Sunny on Tuesday Tuesday... Sunny, with a high near 36.
Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 25.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 40.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 24.
Sunny on New Year's Day New Year's Day... Sunny, with a high near 38.
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.