Know the currents. Know the tide. Real-time weather and tidal predictions for the San Juan Islands — where getting it wrong has consequences. Free, live, from NOAA.
In the San Juans, opposing tide and wind create steep, dangerous chop. Helm WX is one of the only free tools that shows current tidal state alongside live weather — so you can plan your transit intelligently.
Helm WX pulls from NOAA stations at Friday Harbor, the NDBC buoys off Cape Flattery, and voluntary ship reports in the Strait of Juan de Fuca. Real conditions, not just model guesses.
Whether you're anchored in Roche Harbor or waiting out weather in Deer Harbor, Helm WX works on any device with a browser. No app, no subscription — just the data you need.
The San Juan Islands are a cruising paradise — and a navigation challenge. Over 170 named islands sit in waters where the Pacific Ocean tidal exchange creates current velocities that can exceed 5 knots through the major passes. Deception Pass, at the south end of the archipelago, regularly sees 8+ knots at spring tides.
Weather here is shaped by the Olympic Mountains to the south and the Cascade Range to the east. The islands sit in a rain shadow — often clear when Seattle is socked in — but the Strait of Juan de Fuca can pump 25-knot westerlies through the channels on summer afternoons. Wind-against-tide conditions in Rosario Strait and Haro Strait are notorious for short, steep seas.
Popular destinations like Roche Harbor, Friday Harbor, and Sucia Island are well worth the trip — but the passages between them reward careful planning. Helm WX puts the NOAA tide prediction for Friday Harbor right next to the live wind and wave data from the nearest buoy, so your passage timing is based on facts, not guesses.
Get real-time wind, waves, and tide predictions for the San Juan Islands. Plan your passages confidently — free, no app needed.
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