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.
Overnight
41°F
Patchy Fog
Patchy fog. Partly cloudy. Low around 41, with temperatures rising to around 43 overnight. Wind around 0 mph.
7-day forecast for Friday Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 41°F | Patchy Fog | 0 mph | 1% |
| Wednesday | 54°F | Patchy Fog then Light Rain | 0 to 8 mph SE | 76% |
| Wednesday Night | 44°F | Light Rain | 7 to 12 mph S | 88% |
| Thursday | 55°F | Partly Sunny | 8 to 12 mph S | 11% |
| Thursday Night | 45°F | Light Rain | 8 to 18 mph SE | 93% |
| Friday | 55°F | Light Rain | 13 to 25 mph SE | 93% |
| Friday Night | 45°F | Light Rain Likely | 1 to 13 mph ESE | 62% |
| Saturday | 60°F | Chance Light Rain | 3 to 16 mph ESE | 47% |
| Saturday Night | 46°F | Light Rain | 9 to 17 mph SSE | 83% |
| Sunday | 54°F | Chance Light Rain | 6 to 10 mph SSW | 51% |
| Sunday Night | 43°F | Slight Chance Light Rain | 0 to 6 mph SW | 15% |
| Monday | 52°F | Chance Light Rain | 0 to 9 mph ENE | 49% |
| Monday Night | 44°F | Light Rain Likely | 9 to 16 mph SE | 63% |
| Tuesday | 55°F | Light Rain Likely | 15 to 22 mph SE | 63% |
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 Nov 4, 2026.