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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.