Fairmount, IL Weather & Growing Conditions
Tonight
58°F
Rain Likely then Rain Showers
Rain likely and a slight chance of thunderstorms before midnight, then rain showers. Mostly cloudy, with a low around 58. South wind 14 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Rain Likely then Rain Showers | 14 to 17 mph S | 86% |
| Wednesday | 65°F | Chance Light Rain then Mostly Cloudy | 10 to 15 mph SSW | 29% |
| Wednesday Night | 45°F | Mostly Cloudy | 8 mph SW | 1% |
| Thursday | 63°F | Mostly Sunny | 7 to 13 mph WSW | 3% |
| Thursday Night | 43°F | Mostly Cloudy | 5 mph WNW | 6% |
| Friday | 57°F | Partly Sunny | 3 to 9 mph NNW | 13% |
| Friday Night | 36°F | Mostly Cloudy | 2 to 7 mph NNW | 7% |
| Saturday | 55°F | Mostly Sunny | 3 mph NW | 2% |
| Saturday Night | 33°F | Partly Cloudy | 1 mph W | 2% |
| Sunday | 60°F | Mostly Sunny | 1 to 7 mph W | 10% |
| Sunday Night | 33°F | Mostly Clear | 5 mph WNW | 9% |
| Monday | 64°F | Sunny | 2 to 9 mph WSW | 5% |
| Monday Night | 38°F | Mostly Clear | 5 mph WSW | 2% |
| Tuesday | 66°F | Sunny | 6 mph W | 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 Nov 4, 2026.