Fairmont, Illinois Weather
your sport, your way
Air Sports Net on FacebookAir Sports Net on Google +Air Sports Net on TwitterReceive RSS UpdatesReceive Email Updates

Click for Air Quality Alert for Fairmont, Illinois
Change location by the zip code or city,state: or search for other weather forecast locations in Illinois by name.
Weather Forecast for Fairmont, Illinois : Madison County
Issued: 5:26 am CDT Sep 16, 2025 Latitude: 38.9089371 Longitude: -90.2142773 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Wednesday Thursday Friday Saturday Sunday Monday
Sunny on Today Mostly Clear on Tonight Sunny on Wednesday Mostly Sunny on Thursday 40% chance of thunderstorms on Friday 30% chance of thunderstorms on Saturday 30% chance of thunderstorms on Sunday 30% chance of thunderstorms on Monday
High: 94°F Low: 65°F High: 93°F High: 94°F High: 86°F High: 85°F High: 87°F High: 88°F
Low: 64°F Low: 67°F Low: 65°F Low: 66°F Low: 67°F  
Sunny Mostly Clear Sunny Mostly Sunny Thunderstorms Thunderstorms Thunderstorms Thunderstorms
-
Current Conditions at
ALTON - (KALN)
61°
Clear
as of 6:50 AM CDST
Rel. Humidity: 100%
Dew Point: 61°F
Visibility: 10 Miles
Pressure: 30.16 in.
Flight Rule: VFR
Wind Data
6 MPH
350° North
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
64°
Clear
as of 6:54 AM CDST
Rel. Humidity: 93%
Dew Point: 63°F
Visibility: 9 Miles
Pressure: 30.14 in.
Flight Rule: VFR
Wind Data
3 MPH
330° Northwest
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
70°
Mostly Clear
as of 6:51 AM CDST
Rel. Humidity: 77%
Dew Point: 63°F
Visibility: 10 Miles
Pressure: 30.15 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Few at 25000ft
Sunny on Today Today... Sunny, with a high near 94. Northeast wind 3 to 7 mph.
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 65. Northeast wind around 6 mph.
Sunny on Wednesday Wednesday... Sunny, with a high near 93. Light east wind.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 64. Light east wind.
Mostly Sunny on Thursday Thursday... Mostly sunny, with a high near 94. Calm wind becoming south around 6 mph in the morning.
20% chance of rain Thursday Night Thursday Night... A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 67.
40% chance of thunderstorms Friday Friday... A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 86. Chance of precipitation is 40%.
40% chance of thunderstorms Friday Night Friday Night... A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
30% chance of thunderstorms Saturday Saturday... A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 85. Chance of precipitation is 30%.
20% chance of thunderstorms Saturday Night Saturday Night... A slight chance of showers and thunderstorms. Partly cloudy, with a low around 66. Chance of precipitation is 20%.
30% chance of thunderstorms Sunday Sunday... A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
30% chance of thunderstorms Sunday Night Sunday Night... A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
30% chance of thunderstorms Monday Monday... A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Sun Almanac for Fairmont, Illinois
Sunrise: 06:44 AM
Sunset: 7:07 PM
Civil Sunrise:06:17 AM
Civil Sunset: 7:34 PM
Nautical Sunrise: 05:46 AM
Nautical Sunset: 8:05 PM
Astro Sunrise: 05:14 AM
Astro Sunset: 8:37 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.