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.
This Afternoon
52°F
Partly Sunny
Partly sunny. High near 52, with temperatures falling to around 50 in the afternoon. North wind around 2 mph.
7-day forecast for Roche Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 52°F | Partly Sunny | 2 mph N | 5% |
| Tonight | 41°F | Partly Cloudy then Patchy Fog | 1 mph ENE | 5% |
| Wednesday | 53°F | Patchy Fog then Chance Light Rain | 3 mph ESE | 35% |
| Wednesday Night | 44°F | Light Rain | 2 to 7 mph SSE | 90% |
| Thursday | 55°F | Mostly Sunny then Chance Light Rain | 7 mph S | 25% |
| Thursday Night | 45°F | Light Rain | 5 to 17 mph SE | 81% |
| Friday | 55°F | Light Rain | 10 to 17 mph SSE | 81% |
| Friday Night | 45°F | Chance Light Rain | 5 to 10 mph ESE | 38% |
| Saturday | 58°F | Chance Light Rain | 5 to 12 mph ESE | 49% |
| Saturday Night | 47°F | Light Rain | 12 to 20 mph S | 80% |
| Sunday | 55°F | Light Rain Likely | 7 to 13 mph SSW | 62% |
| Sunday Night | 44°F | Slight Chance Light Rain | 7 mph SE | 17% |
| Monday | 54°F | Light Rain Likely | 5 to 10 mph ESE | 60% |
| Monday Night | 46°F | Light Rain | 10 to 17 mph SE | 76% |
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 Nov 4, 2026.