Rock Island, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock Island, a city in Chelan County, Washington.
Today
54°F
Sunny
Sunny. High near 54, with temperatures falling to around 49 in the afternoon. East wind 0 to 7 mph.
7-day forecast for Rock Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 54°F | Sunny | 0 to 7 mph E | 12% |
| Tonight | 39°F | Chance Rain Showers | 0 to 3 mph NE | 30% |
| Thursday | 58°F | Patchy Fog then Sunny | 0 to 5 mph W | 0% |
| Thursday Night | 39°F | Partly Cloudy | 2 mph NW | 11% |
| Friday | 53°F | Mostly Cloudy | 0 to 3 mph E | 11% |
| Friday Night | 38°F | Mostly Cloudy | 3 mph N | 7% |
| Saturday | 57°F | Partly Sunny | 1 to 5 mph NE | 2% |
| Saturday Night | 40°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph NW | 15% |
| Sunday | 58°F | Slight Chance Rain Showers then Partly Sunny | 3 to 8 mph W | 15% |
| Sunday Night | 37°F | Mostly Cloudy | 2 to 6 mph NW | 2% |
| Monday | 55°F | Partly Sunny then Slight Chance Rain Showers | 0 to 3 mph N | 15% |
| Monday Night | 37°F | Slight Chance Rain Showers | 1 mph NW | 24% |
| Tuesday | 56°F | Slight Chance Rain Showers | 0 to 3 mph E | 24% |
| Tuesday Night | 39°F | Chance Rain Showers | 3 mph NE | 26% |
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 Nov 4, 2026.