Rock Valley, IA Weather & Growing Conditions
Tonight
40°F
Rain Showers
Rain showers. Cloudy. Low around 40, with temperatures rising to around 43 overnight. Northwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 40°F | Rain Showers | 15 to 20 mph NW | 98% |
| Wednesday | 47°F | Rain Showers | 15 mph NW | 81% |
| Wednesday Night | 38°F | Rain Showers Likely | 10 mph NW | 59% |
| Thursday | 48°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph NNW | 18% |
| Thursday Night | 33°F | Mostly Cloudy | 0 to 5 mph N | 0% |
| Friday | 48°F | Partly Sunny | 0 mph | 0% |
| Friday Night | 31°F | Mostly Cloudy | 0 mph | 1% |
| Saturday | 56°F | Mostly Sunny | 0 to 5 mph WSW | 2% |
| Saturday Night | 35°F | Mostly Clear | 0 to 5 mph WNW | 5% |
| Sunday | 59°F | Sunny | 0 to 5 mph WSW | 3% |
| Sunday Night | 38°F | Mostly Clear | 5 mph S | 0% |
| Monday | 61°F | Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 38°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Tuesday | 58°F | Mostly Sunny | 0 to 5 mph WSW | 1% |
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 Nov 4, 2026.