Rock Island, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock Island, a city in Chelan County, Washington.
Overnight
57°F
Mostly Clear
Mostly clear. Low around 57, with temperatures rising to around 59 overnight. Northwest wind around 5 mph.
7-day forecast for Rock Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Mostly Clear | 5 mph NW | 0% |
| Saturday | 82°F | Mostly Sunny | 2 to 7 mph SW | 0% |
| Saturday Night | 58°F | Mostly Clear | 0 to 5 mph NE | 0% |
| Sunday | 83°F | Sunny | 6 mph E | 0% |
| Sunday Night | 58°F | Mostly Clear | 0 to 5 mph W | 0% |
| Monday | 85°F | Sunny | 1 to 5 mph NW | 0% |
| Monday Night | 57°F | Partly Cloudy | 3 to 8 mph NW | 0% |
| Tuesday | 80°F | Mostly Sunny | 2 to 9 mph W | 0% |
| Tuesday Night | 54°F | Partly Cloudy | 3 to 9 mph W | 0% |
| Wednesday | 76°F | Mostly Sunny | 5 to 9 mph W | 0% |
| Wednesday Night | 54°F | Mostly Cloudy | 5 to 8 mph W | 1% |
| Thursday | 73°F | Partly Sunny | 3 to 7 mph NW | 6% |
| Thursday Night | 53°F | Mostly Cloudy | 3 to 7 mph W | 9% |
| Friday | 70°F | Mostly Sunny | 6 to 10 mph NW | 8% |
Forecast source: National Weather Service (api.weather.gov) for Rock Island (47.373, -120.142). Updated through the day.
Growing snapshot for Rock Island
Last spring frost
Apr 8
First fall frost
Oct 24
Growing season
200 days
Hardiness zone
7a
More local growing data for Rock Island: nearby ZIP 98828 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Cashmere
Chelan
Chelan Falls
East Wenatchee
Entiat
Leavenworth
Manson
South Wenatchee
Sunnyslope
Wenatchee
Climate data from the nearest NOAA station, Wenatchee Pangborn Ap, Wa (6.2 mi from Rock Island). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.