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Fairmont, Illinois Weather Forecast
Fairmont, Illinois Weather
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Weather Forecast for Fairmont, Illinois : Madison County
Issued: 3:16 pm CST Nov 21, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Saturday Sunday Monday Tuesday Wednesday Thanksgiving Day Friday
50% chance of rain on This Afternoon 40% chance of rain on Tonight Clearing on Saturday Sunny on Sunday 80% chance of rain on Monday 20% chance of rain on Tuesday Mostly Sunny on Wednesday Mostly Sunny on Thanksgiving Day 20% chance of rain on Friday
High: 56°F Low: 44°F High: 58°F High: 61°F High: 58°F High: 62°F High: 49°F High: 47°F High: 45°F
Low: 40°F Low: 43°F Low: 49°F Low: 35°F Low: 29°F Low: 29°F  
Rain Rain Clearing Sunny Rain Rain Mostly Sunny Mostly Sunny Rain
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Current Conditions at
ALTON - (KALN)
55°
Cloudy
Mist
as of 3:00 PM CST
Rel. Humidity: 93%
Dew Point: 54°F
Visibility: 2 Miles
Pressure: 29.86 in.
Flight Rule: LIFR
Wind Data
6 MPH
050° Northeast
Cloud Level(s): Solid Overcast at 400ft
Current Conditions at
ST CHARLES - (KSET)
55°
Cloudy
as of 3:10 PM CST
Rel. Humidity: 93%
Dew Point: 54°F
Visibility: 10 Miles
Pressure: 29.85 in.
Flight Rule: IFR
Wind Data
10 MPH
050° Northeast
Cloud Level(s): Broken at 800ft, Solid Overcast at 1300ft
Current Conditions at
ST LOUIS - (KSTL)
55°
Cloudy
Mist
as of 2:51 PM CST
Rel. Humidity: 93%
Dew Point: 54°F
Visibility: 2 Miles
Pressure: 29.85 in.
Flight Rule: LIFR
Wind Data
7 MPH
050° Northeast
Cloud Level(s): Solid Overcast at 300ft
Current Conditions at
EAST ST LOUIS - (KCPS)
57°
Cloudy
Mist
as of 2:53 PM CST
Rel. Humidity: 100%
Dew Point: 57°F
Visibility: 3 Miles
Pressure: 29.84 in.
Flight Rule: LIFR
Wind Data
3 MPH
030° Northeast
Cloud Level(s): Solid Overcast at 400ft
50% chance of rain This Afternoon This Afternoon... A 50 percent chance of rain. Cloudy, with a high near 56. Northeast wind 5 to 7 mph.
40% chance of rain Tonight Tonight... A 40 percent chance of rain before 3am. Cloudy, with a low around 44. North wind 6 to 9 mph, with gusts as high as 20 mph.
Clearing on Saturday Saturday... Mostly cloudy through mid morning, then gradual clearing, with a high near 58. North wind 5 to 7 mph becoming west in the afternoon.
Mostly Clear on Saturday Night Saturday Night... Mostly clear, with a low around 40. West wind 3 to 7 mph.
Sunny on Sunday Sunday... Sunny, with a high near 61. Calm wind becoming west around 5 mph.
Mostly Cloudy on Sunday Night Sunday Night... Mostly cloudy, with a low around 43.
80% chance of rain Monday Monday... Rain, mainly after noon. High near 58. Chance of precipitation is 80%.
80% chance of rain Monday Night Monday Night... Rain, mainly before midnight. Low around 49. Chance of precipitation is 80%.
20% chance of rain Tuesday Tuesday... A 20 percent chance of rain. Partly sunny, with a high near 62.
Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 35.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 49.
Cloudy on Wednesday Night Wednesday Night... Partly cloudy, with a low around 29.
Mostly Sunny on Thanksgiving Day Thanksgiving Day... Mostly sunny, with a high near 47.
Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 29.
20% chance of rain Friday Friday... A 20 percent chance of rain. Mostly sunny, with a high near 45.
Current Radar Image


Sun Almanac for Fairmont, Illinois
Sunrise: 06:51 AM
Sunset: 4:43 PM
Civil Sunrise:06:22 AM
Civil Sunset: 5:12 PM
Nautical Sunrise: 05:49 AM
Nautical Sunset: 5:44 PM
Astro Sunrise: 05:17 AM
Astro Sunset: 6:16 PM
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