Fairmount, IL Weather Forecast

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Fairmount, IL Weather Forecast

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Fairmount IL weather  - Clear - 94°F
Clear
94°F
Updated 4:09 pm
Feels Like 102°F
Humidity 52%
Wind SSW 6 mph
Barometer  29.98 in
Dew Point 74°F
Fairmount IL weather  - Clear - 34°C
Clear
34°C
Updated 4:09 pm
Feels Like 39°C
Humidity 52%
Wind SSW 10 km/h
Barometer  101.5 kPa
Dew Point 23°C

Fairmount Weather Forecast

TONIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT LABOR DAY MONDAY NIGHT TUESDAY
Fairmount, IL Weather - Tonight Mostly Clear Fairmount, IL Weather - Thursday Sunny Fairmount, IL Weather - Thursday Night Mostly Clear Fairmount, IL Weather - Friday Sunny Fairmount, IL Weather - Friday Night Partly Cloudy Fairmount, IL Weather - Saturday Chance Of Showers Fairmount, IL Weather - Saturday Night Partly Cloudy Fairmount, IL Weather - Sunday Partly Cloudy Fairmount, IL Weather - Sunday Night Mostly Clear Fairmount, IL Weather - Labor Day Mostly Clear Fairmount, IL Weather - Monday Night Partly Cloudy Fairmount, IL Weather - Tuesday Partly Cloudy
Mostly Clear Sunny Mostly Clear Sunny Partly Cloudy Chance of Showers Partly Cloudy Partly Cloudy Mostly Clear Mostly Clear Partly Cloudy Partly Cloudy
Lo: 75°FLo: 24°C Hi: 95°FHi: 35°C
Lo: 75°FLo: 24°C Hi: 91°FHi: 33°C
Lo: 71°FLo: 22°C Hi: 90°FHi: 32°C
Hi: 85°FHi: 29°C
Lo: 69°FLo: 21°C
Hi: 85°FHi: 29°C
Lo: 69°FLo: 21°C
Hi: 85°FHi: 29°C
Lo: 65°FLo: 18°C
Hi: 85°FHi: 29°C
Lo: 65°FLo: 18°C
Hi: 89°FHi: 32°C
Lo: 69°FLo: 21°C
Hi: 89°FHi: 32°C
Lo: 69°FLo: 21°C
POP: 30%
POP = Probability of Precipitation.
Weather Outlook Updated: 337 PM CDT Wed Sep 02 2026 Fairmount, IL Weather - WeatherWorld.com

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Issued: 150 PM CDT Wed Sep 2 2026

Key Messages

  • Extreme Heat: An Extreme Heat Warning is in effect through Friday as high heat and humidity push peak heat index values to around 105F. Highs may exceed 100F (40% to 80% chance) south of a Springfield to Casey line through Friday, with heat indices lingering near 100F into Saturday.
  • Isolated Severe Storm Potential: While dry conditions dominate, there is a low risk (under 20% chance) for isolated pop-up afternoon or evening thunderstorm Thursday and Friday. Any storm that develop cou...