passageweather.com
PassageWeather.com is a free marine forecast website that helps sailors study wind, waves, pressure, rain, and sea conditions before an offshore trip.
What does PassageWeather.com do?
PassageWeather turns complex weather model data into simple forecast maps for sailors, boat crews, racers, and ocean travelers.
The site provides forecasts for up to seven days, so users can compare possible departure times and watch weather systems develop.
Its maps cover the Mediterranean, Atlantic, Pacific, Indian Ocean, Caribbean, Great Lakes, and many smaller sailing regions.
There are also maps built around common routes, such as Newport to Bermuda, California to Hawaii, and the Mediterranean to the Caribbean.
This route-based design is useful because sailors often care about the full journey, not only the weather at one port.
What weather information can you see?
The main products show wind speed, wind direction, wave height, atmospheric pressure, rain, visibility, and sea temperature.
Wind arrows show where the air is moving, while colors make strong and weak wind areas easy to compare.
Wave maps help crews find rough water, large swells, and calmer areas along a planned route.
Pressure maps show high and low pressure systems, which can help experienced sailors understand the wider weather pattern.
Users can move through forecast times to see whether conditions are growing, fading, or changing direction.
This time sequence is often more useful than one weather image because a safe route can become difficult several hours later.
Where does the forecast data come from?
PassageWeather processes data from major forecast systems, including GFS, ECMWF, NAM, COAMPS, and WaveWatch III (PassageWeather).
These models are also used to produce GRIB files for navigation and weather-routing software.
GFS provides broad global forecasts, while regional models can offer more detail in certain covered areas.
WaveWatch III focuses on ocean waves and helps estimate swell height, direction, and movement.
PassageWeather does not create observations at sea, but it presents model output in maps that are easier to read quickly.
The site also says it now carries next-generation, AI-driven global forecast models, although sailors should still compare every model with official warnings.
How should sailors use the maps?
Start by selecting the sea, coast, or passage that covers the whole planned route.
Check wind and waves together because moderate wind can still produce difficult seas when swell direction or current works against the boat.
Next, move through every forecast step from departure until the expected arrival time.
Look for rapid changes, narrow areas of strong wind, crossing swells, and fronts that may reach the route earlier than expected.
Compare more than one model when choices are available because agreement between models can raise confidence in the general pattern.
Check the issue time as well, since an older forecast may no longer describe current conditions.
The site offers a low-bandwidth interface, which can be helpful when a boat has slow or costly internet access (PassageWeather Mini).
However, crews should save key information before leaving reliable internet coverage because no web service is guaranteed to remain available offshore.
Is PassageWeather.com accurate enough for navigation?
PassageWeather is valuable for planning, but it should never be the only source used for a safety decision.
Its maps come from raw computer models and are not reviewed by a human forecaster before display.
The company warns that models can miss local coastal winds, fast-changing fronts, convergence zones, and other small weather features (PassageWeather Disclaimer).
Mountains, islands, bays, and narrow channels can create wind conditions that a large model grid does not show well.
Global models may suggest the path of a tropical cyclone while seriously underestimating its strongest winds.
For tropical storms and hurricanes, crews must follow official cyclone centers, marine bulletins, and emergency warnings.
NOAA also recommends using official marine forecasts together with buoy reports, tide information, and other regional products (NOAA Marine Forecasts).
A forecast map is guidance, not proof that a passage will be safe.
What makes the website useful?
The site’s strongest feature is its fast visual overview of a large sailing area.
A crew can scan several days of wind and wave maps without downloading special navigation software or opening a paid account.
Its coverage of named ocean routes also saves time during the early planning stage.
The website has an older visual style, but its direct menus keep the main forecast products easy to reach.
PassageWeather says its standard forecasts will remain free, with advertising and user support helping to fund the service.
It also offers paid custom weather routing and historical weather work for sailors who need more detailed help.
Who will get the most value from PassageWeather?
The site is best for sailors who understand basic wind, wave, and pressure maps and want a quick view of an entire route.
New sailors can still use it, but they should first learn the map units, arrow symbols, model names, and forecast times.
Experienced crews will gain the most value by comparing its maps with official warnings, onboard observations, routing tools, and updated GRIB data.
Used this way, PassageWeather becomes a strong planning aid rather than a single answer to a complex safety question.
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