Friday Harbor, WA Weather & Growing Conditions
Tonight
40°F
Partly Cloudy then Patchy Fog
Patchy fog after 2am. Partly cloudy. Low around 40, with temperatures rising to around 42 overnight. North northeast wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 40°F | Partly Cloudy then Patchy Fog | 2 mph NNE | 4% |
| Wednesday | 55°F | Patchy Fog then Chance Light Rain | 5 mph ESE | 33% |
| Wednesday Night | 44°F | Light Rain | 2 to 6 mph SSE | 91% |
| Thursday | 56°F | Mostly Sunny then Slight Chance Light Rain | 8 mph S | 24% |
| Thursday Night | 44°F | Light Rain | 5 to 17 mph SE | 80% |
| Friday | 56°F | Light Rain | 10 to 17 mph SSE | 80% |
| Friday Night | 44°F | Chance Light Rain | 3 to 10 mph SE | 37% |
| Saturday | 60°F | Chance Light Rain | 3 to 13 mph ESE | 46% |
| Saturday Night | 45°F | Light Rain | 8 to 18 mph SSE | 79% |
| Sunday | 56°F | Light Rain Likely | 6 to 9 mph SSW | 63% |
| Sunday Night | 42°F | Slight Chance Light Rain | 2 to 6 mph SE | 17% |
| Monday | 55°F | Light Rain Likely | 3 to 10 mph ESE | 60% |
| Monday Night | 44°F | Light Rain Likely | 10 to 14 mph SE | 73% |
| Tuesday | 57°F | Light Rain Likely | 14 to 18 mph SE | 73% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Friday Harbor, WA
Last spring frost
Mar 26
First fall frost
Nov 10
Growing season
230 days
Hardiness zone
9a
Explore more for Friday Harbor, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Friday Harbor Ap, Wa (3.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.