Harman US

Fairmount, IL Weather & Growing Conditions

This Afternoon
86°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly cloudy, with a high near 86. South southeast wind around 6 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
This Afternoon 86°F Slight Chance Showers And Thunderstorms 6 mph SSE 18%
Tonight 68°F Mostly Cloudy 6 mph S 12%
Sunday 83°F Partly Sunny then Chance Showers And Thunderstorms 3 to 10 mph N 46%
Sunday Night 59°F Chance Showers And Thunderstorms 9 to 13 mph NNE 41%
Monday 70°F Showers And Thunderstorms Likely 14 mph NE 61%
Monday Night 54°F Chance Rain Showers 10 to 14 mph NE 46%
Tuesday 68°F Chance Rain Showers 14 mph NE 43%
Tuesday Night 54°F Slight Chance Rain Showers then Mostly Cloudy 6 to 14 mph NNE 20%
Wednesday 69°F Partly Sunny 7 to 10 mph NNE 11%
Wednesday Night 54°F Mostly Cloudy 3 to 10 mph N 2%
Thursday 72°F Partly Sunny 7 mph NNE 2%
Thursday Night 55°F Mostly Cloudy 2 to 6 mph NNE 5%
Friday 75°F Partly Sunny 3 to 7 mph NNE 5%
Friday Night 54°F Partly Cloudy 2 to 6 mph NE 4%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Fairmount, IL

Last spring frost
Apr 19
First fall frost
Oct 19
Growing season
181 days
Hardiness zone
6a

Explore more for Fairmount, IL: full frost dates · planting calendar · Illinois frost dates

Climate data from the nearest NOAA station, Sidell 4N, Il (4.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.