Rock Falls, IA Weather & Growing Conditions
Tonight
45°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. Low around 45, with temperatures rising to around 50 overnight. South wind 6 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 45°F | Showers And Thunderstorms | 6 to 10 mph S | 85% |
| Wednesday | 51°F | Rain Showers | 9 to 14 mph WSW | 85% |
| Wednesday Night | 41°F | Rain Showers | 9 to 13 mph W | 80% |
| Thursday | 49°F | Rain Showers Likely | 14 mph NNW | 64% |
| Thursday Night | 34°F | Mostly Cloudy | 6 to 10 mph N | 12% |
| Friday | 48°F | Partly Sunny | 3 to 8 mph NNE | 1% |
| Friday Night | 29°F | Partly Cloudy | 2 mph ENE | 1% |
| Saturday | 52°F | Mostly Sunny | 1 to 6 mph SW | 1% |
| Saturday Night | 34°F | Partly Cloudy | 5 mph W | 5% |
| Sunday | 58°F | Sunny | 7 mph WNW | 7% |
| Sunday Night | 35°F | Mostly Clear | 6 mph SW | 1% |
| Monday | 61°F | Mostly Sunny | 6 to 10 mph WSW | 0% |
| Monday Night | 38°F | Mostly Clear | 6 mph WNW | 1% |
| Tuesday | 58°F | Mostly Sunny | 7 mph WNW | 1% |
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 Nov 4, 2026.