Friday Harbor, WA Weather & Growing Conditions
Overnight
50°F
Mostly Cloudy
Mostly cloudy. Low around 50, with temperatures rising to around 52 overnight. South southwest wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 50°F | Mostly Cloudy | 1 mph SSW | 0% |
| Saturday | 68°F | Partly Sunny | 2 mph S | 0% |
| Saturday Night | 50°F | Partly Cloudy | 2 mph SSW | 0% |
| Sunday | 68°F | Partly Sunny | 2 mph W | 0% |
| Sunday Night | 50°F | Partly Cloudy | 2 mph WSW | 0% |
| Monday | 70°F | Mostly Sunny | 0 to 3 mph SSW | 0% |
| Monday Night | 50°F | Partly Cloudy | 2 mph WSW | 0% |
| Tuesday | 69°F | Mostly Sunny | 1 to 5 mph WSW | 0% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 mph SW | 6% |
| Wednesday | 68°F | Partly Sunny | 5 mph SSW | 12% |
| Wednesday Night | 50°F | Mostly Cloudy | 1 to 5 mph WSW | 10% |
| Thursday | 66°F | Partly Sunny | 1 to 6 mph NW | 14% |
| Thursday Night | 49°F | Mostly Cloudy | 3 mph WNW | 14% |
| Friday | 66°F | Mostly Sunny | 3 to 8 mph NW | 10% |
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 Sep 19, 2026.