Roche Harbor, WA Weather & Growing Conditions
Today
54°F
Mostly Cloudy then Light Rain
Rain after 4pm. Mostly cloudy. High near 54, with temperatures falling to around 51 in the afternoon. Southeast wind around 7 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 54°F | Mostly Cloudy then Light Rain | 7 mph SE | 78% |
| Tonight | 47°F | Light Rain | 9 to 14 mph S | 91% |
| Thursday | 54°F | Mostly Sunny | 10 mph S | 11% |
| Thursday Night | 48°F | Light Rain | 9 to 18 mph SE | 94% |
| Friday | 54°F | Light Rain | 14 to 24 mph SE | 94% |
| Friday Night | 48°F | Light Rain Likely | 5 to 14 mph ESE | 64% |
| Saturday | 60°F | Chance Light Rain | 5 to 17 mph ESE | 48% |
| Saturday Night | 49°F | Light Rain | 12 to 22 mph SSE | 84% |
| Sunday | 53°F | Chance Light Rain | 6 to 12 mph SSW | 51% |
| Sunday Night | 46°F | Slight Chance Light Rain | 6 mph SE | 15% |
| Monday | 52°F | Chance Light Rain | 5 to 9 mph E | 49% |
| Monday Night | 48°F | Light Rain Likely | 9 to 18 mph SE | 66% |
| Tuesday | 54°F | Light Rain Likely | 21 mph SE | 66% |
| Tuesday Night | 49°F | Light Rain Likely | 12 to 18 mph SE | 59% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Roche Harbor, WA
Last spring frost
Mar 26
First fall frost
Nov 10
Growing season
230 days
Hardiness zone
9a
Explore more for Roche Harbor, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Friday Harbor Ap, Wa (6.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.