Big Rock, IL Weather & Growing Conditions
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South southwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 to 10 mph SSW | 0% |
| Tonight | 67°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph SSW | 36% |
| Wednesday | 79°F | Showers And Thunderstorms Likely | 5 mph SW | 73% |
| Wednesday Night | 64°F | Showers And Thunderstorms | 5 mph NW | 86% |
| Thursday | 79°F | Rain Showers Likely | 5 mph E | 59% |
| Thursday Night | 61°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SE | 26% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph SE | 6% |
| Friday Night | 63°F | Mostly Clear | 0 to 5 mph SSW | 9% |
| Saturday | 84°F | Mostly Sunny | 5 to 10 mph SSW | 11% |
| Saturday Night | 68°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 18% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SW | 18% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 37% |
| Monday | 85°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 36% |
| Monday Night | 69°F | Chance Showers And Thunderstorms | 10 mph W | 43% |
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 Aug 4, 2026.