Rock Falls, IL Weather & Growing Conditions
Tonight
53°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy. Low around 53, with temperatures rising to around 55 overnight. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Showers And Thunderstorms | 15 mph S | 79% |
| Wednesday | 57°F | Chance Rain Showers then Mostly Cloudy | 15 mph SW | 33% |
| Wednesday Night | 45°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph SW | 22% |
| Thursday | 54°F | Chance Rain Showers | 10 to 15 mph W | 49% |
| Thursday Night | 41°F | Chance Rain Showers | 5 to 10 mph NW | 28% |
| Friday | 52°F | Slight Chance Rain Showers then Partly Sunny | 5 to 10 mph N | 15% |
| Friday Night | 33°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph W | 3% |
| Saturday Night | 34°F | Partly Cloudy | 0 to 5 mph W | 4% |
| Sunday | 58°F | Mostly Sunny | 5 to 10 mph W | 12% |
| Sunday Night | 34°F | Mostly Clear | 0 to 5 mph W | 4% |
| Monday | 62°F | Sunny | 5 to 10 mph SW | 2% |
| Monday Night | 39°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 62°F | Sunny | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Rock Falls, IL
Last spring frost
Apr 21
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
5b
Explore more for Rock Falls, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Dixon 1W, Il (12.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.