Big Rock, IL Weather & Growing Conditions
Tonight
58°F
Rain
Rain. Cloudy. Low around 58, with temperatures rising to around 61 overnight. South wind around 15 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 | 15 mph S | 90% |
| Wednesday | 61°F | Chance Rain then Chance Rain Showers | 15 mph SSW | 50% |
| Wednesday Night | 47°F | Slight Chance Rain Showers | 15 mph SW | 18% |
| Thursday | 56°F | Chance Rain Showers | 10 to 15 mph WSW | 38% |
| Thursday Night | 42°F | Chance Rain Showers | 5 to 10 mph WNW | 37% |
| Friday | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph N | 21% |
| Friday Night | 34°F | Partly Cloudy | 5 to 10 mph NNW | 3% |
| Saturday | 52°F | Mostly Sunny | 5 mph WNW | 4% |
| Saturday Night | 33°F | Partly Cloudy | 0 to 5 mph WSW | 4% |
| Sunday | 57°F | Mostly Sunny | 5 to 10 mph W | 14% |
| Sunday Night | 34°F | Mostly Clear | 5 to 10 mph WNW | 5% |
| Monday | 61°F | Sunny | 5 to 15 mph WSW | 3% |
| Monday Night | 39°F | Mostly Clear | 5 to 10 mph W | 1% |
| Tuesday | 62°F | Sunny | 5 to 10 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Big Rock, IL
Last spring frost
Apr 28
First fall frost
Oct 13
Growing season
166 days
Hardiness zone
5b
Explore more for Big Rock, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Chicago Aurora Muni Ap, Il (3.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.