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
54°F
Clear
Clear. Low around 54, with temperatures rising to around 56 overnight. North northwest wind 0 to 3 mph.
7-day forecast for Friday Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Clear | 0 to 3 mph NNW | 0% |
| Tuesday | 78°F | Sunny | 5 to 8 mph NNW | 0% |
| Tuesday Night | 56°F | Mostly Clear then Patchy Smoke | 0 to 5 mph NW | 0% |
| Wednesday | 81°F | Sunny | 2 to 7 mph NNW | 0% |
| Wednesday Night | 56°F | Mostly Clear | 0 to 5 mph NNW | 0% |
| Thursday | 81°F | Sunny | 0 to 6 mph NW | 0% |
| Thursday Night | 56°F | Mostly Clear | 0 to 3 mph SSW | 0% |
| Friday | 80°F | Sunny | 0 to 7 mph SSW | 0% |
| Friday Night | 55°F | Mostly Clear | 0 to 7 mph SW | 0% |
| Saturday | 76°F | Sunny | 0 to 7 mph SSW | 0% |
| Saturday Night | 54°F | Mostly Clear | 0 to 7 mph SW | 0% |
| Sunday | 74°F | Sunny | 0 to 6 mph SSW | 0% |
| Sunday Night | 53°F | Mostly Clear | 0 to 6 mph WSW | 1% |
| Monday | 74°F | Mostly Sunny | 0 to 6 mph WSW | 1% |
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 Aug 4, 2026.