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Fairmont, Illinois Weather Forecast
Fairmont, Illinois Weather
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 2:21 am CST Jan 5, 2026 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Overnight Monday Tuesday Wednesday Thursday Friday Saturday Sunday
Clear on Overnight Mostly Sunny on Monday Mostly Sunny on Tuesday Mostly Sunny on Wednesday 70% chance of rain on Thursday 50% chance of thunderstorms on Friday Mostly Sunny on Saturday Mostly Sunny on Sunday
Low: 31°F High: 57°F High: 60°F High: 60°F High: 61°F High: 61°F High: 44°F High: 39°F
Low: 46°F Low: 36°F Low: 46°F Low: 50°F Low: 35°F Low: 24°F  
Clear Mostly Sunny Mostly Sunny Mostly Sunny Rain Thunderstorms Mostly Sunny Mostly Sunny
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Current Conditions at
ALTON - (KALN)
34°
Clear
as of 2:35 AM CST
Rel. Humidity: 69%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 29.95 in.
Flight Rule: VFR
Wind Data
3 MPH
180° South
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
Clear
as of 1:54 AM CST
Pressure: 29.93 in.
Wind Data
Calm
Current Conditions at
ST LOUIS - (KSTL)
36°
Mostly Clear
as of 1:51 AM CST
Rel. Humidity: 64%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 29.92 in.
Flight Rule: VFR
Wind Data
3 MPH
180° South
Cloud Level(s): Few at 25000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
32°
Clear
as of 1:53 AM CST
Rel. Humidity: 74%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 29.93 in.
Flight Rule: VFR
Wind Data
5 MPH
180° South
Cloud Level(s): Clear
Clear on Overnight Overnight... Clear, with a low around 31. South wind around 6 mph.
Mostly Sunny on Monday Monday... Mostly sunny, with a high near 57. South wind 6 to 9 mph.
Mostly Cloudy on Monday Night Monday Night... Mostly cloudy, with a low around 46. Southeast wind 7 to 10 mph becoming southwest after midnight.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 60. Southwest wind 8 to 13 mph becoming west in the afternoon. Winds could gust as high as 21 mph.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 36. West wind 5 to 7 mph becoming calm in the evening.
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. Mostly cloudy, with a low around 46.
70% chance of rain Thursday Thursday... Rain likely, mainly after noon. Mostly cloudy, with a high near 61. Chance of precipitation is 70%.
70% chance of rain Thursday Night Thursday Night... Rain likely, mainly before midnight. Mostly cloudy, with a low around 50. Chance of precipitation is 70%.
50% chance of thunderstorms Friday Friday... A chance of rain and thunderstorms. Partly sunny, with a high near 61. Chance of precipitation is 50%.
20% chance of rain Friday Night Friday Night... A 20 percent chance of rain. Mostly cloudy, with a low around 35.
Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 44.
Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 24.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 39.
Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 07:20 AM
Sunset: 4:53 PM
Civil Sunrise:06:50 AM
Civil Sunset: 5:23 PM
Nautical Sunrise: 06:17 AM
Nautical Sunset: 5:56 PM
Astro Sunrise: 05:45 AM
Astro Sunset: 6:28 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.