Friday Harbor, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Friday Harbor, a town in San Juan County, Washington.
Tonight
49°F
Partly Cloudy
Partly cloudy, with a low around 49. Wind around 0 mph.
7-day forecast for Friday Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Partly Cloudy | 0 mph | 1% |
| Saturday | 66°F | Partly Sunny | 0 to 5 mph S | 1% |
| Saturday Night | 49°F | Partly Cloudy | 2 mph SSW | 0% |
| Sunday | 67°F | Mostly Sunny | 0 to 5 mph W | 0% |
| Sunday Night | 50°F | Partly Cloudy | 0 to 3 mph WSW | 0% |
| Monday | 69°F | Mostly Sunny | 0 to 6 mph SSW | 0% |
| Monday Night | 50°F | Partly Cloudy | 0 to 6 mph SW | 0% |
| Tuesday | 67°F | Mostly Sunny | 0 to 7 mph SSW | 2% |
| Tuesday Night | 50°F | Partly Cloudy | 0 to 7 mph SW | 9% |
| Wednesday | 65°F | Partly Sunny | 0 to 6 mph SSW | 5% |
| Wednesday Night | 50°F | Mostly Cloudy | 0 to 5 mph NW | 12% |
| Thursday | 66°F | Partly Sunny then Slight Chance Light Rain | 0 to 8 mph NNW | 20% |
| Thursday Night | 50°F | Chance Light Rain | 0 to 6 mph NW | 31% |
| Friday | 66°F | Chance Light Rain | 0 to 10 mph SSW | 30% |
Forecast source: National Weather Service (api.weather.gov) for Friday Harbor (48.534, -123.019). Updated through the day.
Growing snapshot for Friday Harbor
Last spring frost
Mar 26
First fall frost
Nov 10
Growing season
230 days
Hardiness zone
9a
More local growing data for Friday 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 Friday Harbor). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.