Rock Valley, IA Weather & Growing Conditions
Overnight
62°F
Areas Of Fog
Areas of fog. Cloudy. Low around 62, with temperatures rising to around 65 overnight. North wind 0 to 5 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 62°F | Areas Of Fog | 0 to 5 mph N | 13% |
| Saturday | 68°F | Patchy Fog then Mostly Cloudy | 5 to 10 mph N | 26% |
| Saturday Night | 56°F | Cloudy | 5 to 10 mph NNE | 11% |
| Sunday | 66°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph NE | 22% |
| Sunday Night | 52°F | Rain Showers Likely | 5 to 10 mph ENE | 56% |
| Monday | 61°F | Showers And Thunderstorms Likely | 5 to 10 mph ENE | 56% |
| Monday Night | 46°F | Chance Rain Showers then Mostly Cloudy | 0 to 5 mph E | 29% |
| Tuesday | 62°F | Partly Sunny | 0 to 5 mph E | 4% |
| Tuesday Night | 47°F | Partly Cloudy | 0 to 5 mph ESE | 0% |
| Wednesday | 66°F | Mostly Sunny | 0 to 10 mph SSE | 9% |
| Wednesday Night | 51°F | Mostly Cloudy then Chance Rain Showers | 5 mph SSE | 37% |
| Thursday | 67°F | Chance Rain Showers | 5 mph SSE | 37% |
| Thursday Night | 53°F | Mostly Cloudy then Slight Chance Rain Showers | 0 to 5 mph SE | 18% |
| Friday | 69°F | Slight Chance Rain Showers then Partly Sunny | 0 to 10 mph SE | 18% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Rock Valley, IA
Last spring frost
Apr 30
First fall frost
Oct 3
Growing season
154 days
Hardiness zone
5a
Explore more for Rock Valley, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Sioux Ctr 2 Se, Ia (13.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.