Friday Harbor, WA Weather & Growing Conditions
Today
65°F
Mostly Sunny
Mostly sunny. High near 65, with temperatures falling to around 63 in the afternoon. Southwest wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 65°F | Mostly Sunny | 3 mph SW | 0% |
| Tonight | 51°F | Partly Cloudy | 1 mph SW | 0% |
| Sunday | 66°F | Partly Sunny | 0 to 3 mph WNW | 0% |
| Sunday Night | 51°F | Partly Cloudy | 0 to 3 mph WSW | 0% |
| Monday | 67°F | Mostly Sunny | 0 to 3 mph SSW | 0% |
| Monday Night | 52°F | Partly Cloudy | 0 to 3 mph W | 0% |
| Tuesday | 65°F | Partly Sunny | 0 to 3 mph WSW | 0% |
| Tuesday Night | 51°F | Mostly Cloudy | 5 mph SW | 7% |
| Wednesday | 66°F | Partly Sunny | 5 mph SSW | 14% |
| Wednesday Night | 51°F | Mostly Cloudy | 3 mph WSW | 11% |
| Thursday | 65°F | Mostly Cloudy | 3 mph NW | 13% |
| Thursday Night | 51°F | Slight Chance Light Rain | 3 mph WNW | 16% |
| Friday | 65°F | Mostly Sunny | 2 to 6 mph WNW | 14% |
| Friday Night | 50°F | Partly Cloudy | 1 to 5 mph WNW | 11% |
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 (6.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.