Rock Falls, IA Weather & Growing Conditions
Overnight
60°F
Patchy Fog
Patchy fog and a chance of showers and thunderstorms. Cloudy. Low around 60, with temperatures rising to around 64 overnight. East southeast wind around 5 mph. Chance of precipitation is 50%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 60°F | Patchy Fog | 5 mph ESE | 49% |
| Saturday | 72°F | Patchy Fog | 8 mph NNE | 58% |
| Saturday Night | 56°F | Slight Chance Showers And Thunderstorms | 12 mph NNE | 22% |
| Sunday | 66°F | Mostly Cloudy | 12 to 15 mph NE | 8% |
| Sunday Night | 50°F | Mostly Cloudy then Slight Chance Rain Showers | 13 mph ENE | 24% |
| Monday | 61°F | Chance Rain Showers | 12 mph ENE | 36% |
| Monday Night | 45°F | Chance Rain Showers then Mostly Cloudy | 5 to 9 mph ENE | 28% |
| Tuesday | 61°F | Mostly Sunny | 5 to 8 mph ENE | 12% |
| Tuesday Night | 42°F | Mostly Clear | 2 to 6 mph E | 1% |
| Wednesday | 64°F | Sunny | 6 mph E | 1% |
| Wednesday Night | 47°F | Partly Cloudy | 3 mph ESE | 6% |
| Thursday | 65°F | Partly Sunny | 5 mph SE | 10% |
| Thursday Night | 50°F | Partly Cloudy | 2 mph ESE | 4% |
| Friday | 68°F | Mostly Sunny | 2 to 6 mph ESE | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Rock Falls, IA
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5a
Explore more for Rock Falls, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Mason City, Ia (7.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.