Roche Harbor, San Juan Island Marine Forecast
Washington · 48.610°, -123.155° · National Weather Service
Next 24 hours
7-Day Marine Outlook
Wind, temperature, and conditions for Roche Harbor, San Juan Island.
About the marine forecast for Roche Harbor, San Juan Island
This is the National Weather Service forecast for Roche Harbor, San Juan Island (Washington), covering wind, wave height, temperature, and conditions over the coming week. Wind and seas are what make or break a day on the water, so start there. Remember that gusts, not the average, are what knock you around, and that wind blowing against the tide stacks the seas up steeper than the numbers suggest. Wave height here is the significant wave height, so some individual waves come through taller.
Planning a trip out of Roche Harbor, San Juan Island? Pair this with the Roche Harbor, San Juan Island tide chart so you've got the water and the weather in one look.
Frequently asked
What is the wind forecast for Roche Harbor, San Juan Island today?+
Today at Roche Harbor, San Juan Island, expect wind at 0 mph, with mostly clear. See the hourly breakdown above for how it changes through the day.
Where does this Roche Harbor, San Juan Island marine forecast come from?+
It's the official National Weather Service point forecast for Roche Harbor, San Juan Island's coordinates, covering wind, temperature, and conditions for the next 7 days. It's the same data marine forecasts are built on.
Is it a good day to go boating at Roche Harbor, San Juan Island?+
Check the wind first — it's what makes or breaks a day on the water — then the conditions and any advisories. Match the forecast to your boat and experience, tell someone your plan, and always leave yourself a way back.
See the wind on your chart
Pathr paints live wind, waves, and radar right on the Roche Harbor, San Juan Island chart, and routes you around the shallows. Free to try for two months on iOS.