Roche Harbor, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Roche Harbor, a community in San Juan County, Washington.
Overnight
58°F
Clear
Clear. Low around 58, with temperatures rising to around 60 overnight. North wind 1 to 5 mph.
7-day forecast for Roche Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Clear | 1 to 5 mph N | 0% |
| Tuesday | 79°F | Sunny | 3 to 7 mph N | 0% |
| Tuesday Night | 59°F | Patchy Smoke | 0 to 3 mph NNW | 0% |
| Wednesday | 81°F | Sunny | 2 to 6 mph N | 0% |
| Wednesday Night | 58°F | Mostly Clear | 2 mph ENE | 0% |
| Thursday | 82°F | Sunny | 0 to 3 mph N | 0% |
| Thursday Night | 59°F | Mostly Clear | 1 mph SW | 0% |
| Friday | 82°F | Sunny | 3 mph SSW | 0% |
| Friday Night | 58°F | Mostly Clear | 3 mph WSW | 0% |
| Saturday | 75°F | Sunny | 3 mph WSW | 0% |
| Saturday Night | 56°F | Mostly Clear | 3 mph WSW | 0% |
| Sunday | 73°F | Sunny | 2 mph SW | 0% |
| Sunday Night | 56°F | Mostly Clear | 3 mph WSW | 1% |
| Monday | 72°F | Sunny | 3 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Roche Harbor (48.607, -123.131). Updated through the day.
Growing snapshot for Roche Harbor
Last spring frost
Mar 26
First fall frost
Nov 10
Growing season
230 days
Hardiness zone
9a
More local growing data for Roche Harbor: nearby ZIP 98250 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Friday Harbor Ap, Wa (3.6 mi from Roche Harbor). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.