Harman US

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

WhenTempForecastWindPrecip
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

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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.