Percy, IL Weather & Growing Conditions
Tonight
70°F
Slight Chance Showers And Thunderstorms then Mostly Clear
A slight chance of showers and thunderstorms before 9pm. Mostly clear, with a low around 70. Southeast wind around 2 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 2 mph SE | 23% |
| Saturday | 97°F | Mostly Sunny | 2 to 6 mph SW | 5% |
| Saturday Night | 71°F | Partly Cloudy | 3 mph S | 0% |
| Sunday | 95°F | Mostly Sunny | 6 mph W | 6% |
| Sunday Night | 67°F | Mostly Cloudy then Chance Showers And Thunderstorms | 3 mph N | 35% |
| Monday | 85°F | Chance Showers And Thunderstorms | 3 to 8 mph N | 52% |
| Monday Night | 60°F | Chance Showers And Thunderstorms | 5 to 8 mph N | 52% |
| Tuesday | 74°F | Slight Chance Rain Showers then Partly Sunny | 7 to 12 mph N | 15% |
| Tuesday Night | 55°F | Partly Cloudy | 5 to 12 mph N | 7% |
| Wednesday | 75°F | Mostly Sunny | 6 to 9 mph N | 3% |
| Wednesday Night | 54°F | Partly Cloudy | 2 to 7 mph N | 2% |
| Thursday | 76°F | Mostly Sunny | 3 to 8 mph N | 1% |
| Thursday Night | 56°F | Partly Cloudy | 2 to 7 mph N | 2% |
| Friday | 77°F | Mostly Sunny | 3 to 8 mph N | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Percy, IL
Last spring frost
Apr 12
First fall frost
Oct 22
Growing season
191 days
Hardiness zone
7a
Explore more for Percy, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Sparta 1 W, Il (10 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.