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Fairmont, Illinois Weather Forecast
Fairmont, Illinois Weather
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 5:01 pm CST Dec 13, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Sunday Monday Tuesday Wednesday Thursday Friday Saturday
20% chance of snow on This Afternoon 20% chance of snow on Tonight Sunny on Sunday Sunny on Monday Sunny on Tuesday Mostly Sunny on Wednesday 40% chance of rain on Thursday Mostly Sunny on Friday 20% chance of rain on Saturday
High: 14°F Low: 3 °F High: 14°F High: 41°F High: 51°F High: 54°F High: 57°F High: 40°F High: 55°F
Low: 8 °F Low: 26°F Low: 36°F Low: 44°F Low: 25°F Low: 34°F  
Snow Snow Sunny Sunny Sunny Mostly Sunny Rain Mostly Sunny Rain
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Current Conditions at
ALTON - (KALN)
16°
Feels like 0°F
Cloudy
as of 5:02 PM CST
Rel. Humidity: 72%
Dew Point: 9°F
Visibility: 10 Miles
Pressure: 30.36 in.
Flight Rule: MVFR
Wind Data
16 MPH
350° North
Cloud Level(s): Broken at 1500ft, Broken at 2200ft, Solid Overcast at 3000ft
Current Conditions at
ST CHARLES - (KSET)
14°
Feels like 0°F
Cloudy
as of 4:54 PM CST
Rel. Humidity: 72%
Dew Point: 7°F
Visibility: 10 Miles
Pressure: 30.37 in.
Flight Rule: VFR
Wind Data
13 MPH
Gust: 22 MPH
350° North
Cloud Level(s): Few at 1800ft, Solid Overcast at 3100ft
Current Conditions at
ST LOUIS - (KSTL)
16°
Feels like 2°F
Cloudy
Light Snow
as of 4:51 PM CST
Rel. Humidity: 78%
Dew Point: 10°F
Visibility: 8 Miles
Pressure: 30.34 in.
Flight Rule: MVFR
Wind Data
13 MPH
0° North
Cloud Level(s): Solid Overcast at 1500ft
Current Conditions at
EAST ST LOUIS - (KCPS)
18°
Feels like 4°F
Cloudy
as of 4:53 PM CST
Rel. Humidity: 72%
Dew Point: 10°F
Visibility: 8 Miles
Pressure: 30.34 in.
Flight Rule: MVFR
Wind Data
13 MPH
350° North
Cloud Level(s): Solid Overcast at 1600ft
20% chance of snow This Afternoon This Afternoon... A 20 percent chance of snow. Cloudy and cold, with a steady temperature around 14. Northeast wind around 8 mph, with gusts as high as 20 mph.
20% chance of snow Tonight Tonight... A chance of flurries before 7pm. Cloudy during the early evening, then gradual clearing, with a low around 3. Wind chill values as low as -10. Northwest wind 10 to 14 mph, with gusts as high as 22 mph.
Sunny on Sunday Sunday... Sunny and cold, with a high near 14. Wind chill values as low as -10. North wind 5 to 13 mph, with gusts as high as 21 mph.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 8. Light and variable wind becoming south 5 to 8 mph in the evening.
Sunny on Monday Monday... Sunny, with a high near 41. Southwest wind 7 to 14 mph, with gusts as high as 22 mph.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 26.
Sunny on Tuesday Tuesday... Sunny, with a high near 51.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 36.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 54.
30% chance of rain Wednesday Night Wednesday Night... A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 44.
40% chance of rain Thursday Thursday... A 40 percent chance of rain. Partly sunny, with a high near 57.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 25.
Mostly Sunny on Friday Friday... Mostly sunny, with a high near 40.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 34.
20% chance of rain Saturday Saturday... A 20 percent chance of rain. Partly sunny, with a high near 55.
Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 07:11 AM
Sunset: 4:39 PM
Civil Sunrise:06:41 AM
Civil Sunset: 5:09 PM
Nautical Sunrise: 06:08 AM
Nautical Sunset: 5:43 PM
Astro Sunrise: 05:35 AM
Astro Sunset: 6:15 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.