Fairmont, Illinois Weather
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 8:21 am CDT Sep 18, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

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Today Tonight Friday Saturday Sunday Monday Tuesday Wednesday
Sunny on Today Increasing Clouds on Tonight 30% chance of thunderstorms on Friday 20% chance of thunderstorms on Saturday 50% chance of thunderstorms on Sunday 50% chance of thunderstorms on Monday 30% chance of thunderstorms on Tuesday 30% chance of thunderstorms on Wednesday
High: 93°F Low: 65°F High: 88°F High: 87°F High: 83°F High: 83°F High: 83°F High: 82°F
Low: 65°F Low: 67°F Low: 67°F Low: 66°F Low: 62°F  
Sunny Increasing Clouds Thunderstorms Thunderstorms Thunderstorms Thunderstorms Thunderstorms Thunderstorms
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Current Conditions at
ALTON - (KALN)
63°
Clear
as of 7:50 AM CDST
Rel. Humidity: 77%
Dew Point: 55°F
Visibility: 10 Miles
Pressure: 30.04 in.
Flight Rule: VFR
Wind Data
5 MPH
110° East
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
64°
Clear
as of 7:54 AM CDST
Rel. Humidity: 82%
Dew Point: 59°F
Visibility: 10 Miles
Pressure: 30.02 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
70°
Mostly Clear
as of 7:51 AM CDST
Rel. Humidity: 68%
Dew Point: 59°F
Visibility: 9 Miles
Pressure: 30.03 in.
Flight Rule: VFR
Wind Data
6 MPH
110° East
Cloud Level(s): Few at 25000ft
Current Conditions at
EAST ST LOUIS - (KCPS)
64°
Clear
as of 7:53 AM CDST
Rel. Humidity: 82%
Dew Point: 59°F
Visibility: 10 Miles
Pressure: 30.02 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Sunny on Today Today... Sunny, with a high near 93. Southeast wind 3 to 5 mph.
Increasing Clouds on Tonight Tonight... Increasing clouds, with a low around 65. Northwest wind 5 to 7 mph becoming light and variable.
30% chance of thunderstorms Friday Friday... A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 88. Calm wind becoming southwest around 5 mph in the afternoon.
30% chance of thunderstorms Friday Night Friday Night... A chance of showers and thunderstorms. Partly cloudy, with a low around 65. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
20% chance of thunderstorms Saturday Saturday... A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 20%.
30% chance of thunderstorms Saturday Night Saturday Night... A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 67.
50% chance of thunderstorms Sunday Sunday... A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 83. Chance of precipitation is 50%.
60% chance of thunderstorms Sunday Night Sunday Night... Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
50% chance of thunderstorms Monday Monday... A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83.
40% chance of thunderstorms Monday Night Monday Night... A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
30% chance of thunderstorms Tuesday Tuesday... A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.
20% chance of rain Tuesday Night Tuesday Night... A 20 percent chance of showers. Partly cloudy, with a low around 62.
30% chance of thunderstorms Wednesday Wednesday... A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 06:45 AM
Sunset: 7:04 PM
Civil Sunrise:06:19 AM
Civil Sunset: 7:31 PM
Nautical Sunrise: 05:48 AM
Nautical Sunset: 8:02 PM
Astro Sunrise: 05:16 AM
Astro Sunset: 8:34 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.