Fairmount, IL Weather & Growing Conditions
Today
87°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms between 8am and 3pm. Mostly cloudy, with a high near 87. South southeast wind around 7 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Chance Showers And Thunderstorms | 7 mph SSE | 48% |
| Tonight | 69°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph S | 18% |
| Sunday | 82°F | Chance Showers And Thunderstorms | 2 to 10 mph N | 65% |
| Sunday Night | 59°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 14 mph NE | 63% |
| Monday | 69°F | Showers And Thunderstorms Likely | 13 to 16 mph NE | 69% |
| Monday Night | 54°F | Chance Rain Showers | 12 to 16 mph NE | 48% |
| Tuesday | 68°F | Chance Showers And Thunderstorms | 14 mph NE | 31% |
| Tuesday Night | 53°F | Chance Showers And Thunderstorms then Mostly Cloudy | 7 to 14 mph NNE | 31% |
| Wednesday | 70°F | Partly Sunny | 10 mph NNE | 7% |
| Wednesday Night | 54°F | Mostly Cloudy | 5 to 10 mph NNE | 7% |
| Thursday | 71°F | Partly Sunny | 8 mph NNE | 2% |
| Thursday Night | 55°F | Partly Cloudy | 3 to 7 mph NNE | 2% |
| Friday | 74°F | Mostly Sunny | 5 to 9 mph NNE | 2% |
| Friday Night | 53°F | Partly Cloudy | 3 to 8 mph NE | 2% |
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.