Weather planning in French Polynesia comes down to two overlapping questions: which season are you sailing in, and how good is today’s specific forecast. Get the season wrong and you risk a passage during the cyclone window; get the day-to-day forecast wrong and you risk a rough crossing even in the right season. This guide covers both — the broad seasonal pattern that governs when most cruisers move through the region, and the specific forecasting resources used to fine-tune an actual departure date.
The Two Seasons That Matter
French Polynesia’s sailing year splits into two broad periods, and almost every routing decision in the region traces back to which one you are in.
The dry season (roughly May through October) is the trade wind season and the period when the overwhelming majority of offshore passages through French Polynesia happen. Southeast trade winds are more consistent during this window, typically blowing in the 15-25 knot range with periodic squalls, and the risk of tropical cyclone formation is at its lowest. Most Marquesas arrivals, Tuamotu transits, and Society Islands cruising happens within this window, timed so that boats have cleared the region — or are at minimum well clear of the more exposed passages — before the wet season sets in.
The wet season (roughly November through April) brings reduced and less consistent trade winds, more variable wind direction, higher humidity and rainfall, and — critically — the official French Polynesian tropical cyclone season. Most cruisers plan to have completed their major open-ocean legs through the region before this window opens, and boats that do stay through the wet season typically arrange secure haul-out or cyclone-mooring arrangements rather than continuing to cruise on exposed anchorages.
Trade wind direction shifts through the year in a pattern worth knowing when planning a specific route leg: winds tend to blow more from the east during the February-April period, shift toward east-southeast from roughly May through November, and swing toward east-northeast in December and January. A route that is a comfortable reach in one part of the season can be a harder beat a few months later purely from this seasonal wind-direction shift — worth factoring in when choosing a departure month for a specific leg, not just a general season.
Cyclone Season: What It Actually Means for Planning
The French Polynesian cyclone season runs officially from November through April, with the highest concentration of storm activity typically falling in January and February. This does not mean the entire six-month window is uniformly dangerous — many wet-season weeks pass with no cyclone activity at all — but it does mean the region is climatologically exposed during this period, and insurance, haul-out availability, and prudent seamanship all treat it accordingly.
Practical implications for cruisers:
- Marine insurance policies commonly restrict or exclude cyclone-season coverage for vessels left in exposed locations during the November-April window; confirm your specific policy’s geographic and seasonal terms well before the season starts, not after you are already committed to staying.
- Cyclone moorings and haul-out slots fill up in the weeks before the season opens. Boats planning to leave a vessel in French Polynesia through the wet season should arrange secure storage in advance rather than assuming last-minute availability.
- Passage planning should build in a buffer, not a hard cutoff. A passage planned to finish “just before” the season opens leaves no margin if a weather delay pushes departure back; experienced routers generally recommend completing exposed open-water legs with real buffer before the seasonal window rather than racing the calendar.
Weather Routing Resources Cruisers Actually Use
Météo-France Polynésie is the official meteorological authority for French Polynesia and the primary resource cruisers in the region rely on. It publishes marine forecasts and bulletins by archipelago, along with tropical weather advisories during the cyclone season. For any passage originating or transiting through French Polynesian waters, this is the first and most authoritative source to check, and the one to keep monitoring throughout a passage where connectivity allows.
Grib-file weather routing software (PredictWind, Windy, and similar GFS/ECMWF-model viewers) is standard equipment for most offshore cruisers today, used to visualize wind, pressure, and swell forecasts several days out and to identify a viable departure window for a specific route. These tools are excellent for trend-spotting but should be cross-checked against official bulletins rather than treated as a sole source, particularly during the shoulder months when tropical development risk is elevated but not yet officially flagged.
SSB and ham radio weather nets remain part of the routing toolkit for cruisers without reliable satellite data connectivity offshore — nets such as the Pacific Seafarer’s Net provide position reporting and shared weather observations from boats already underway, which is genuinely useful real-time intelligence that a grib file alone cannot provide.
Professional weather routing services, where a router reviews your specific route, boat, and timeline and recommends a departure window, are used by a meaningful share of offshore cruisers for the longer or more exposed legs (Marquesas landfall, the Tuamotu transit, or a westward passage toward the Cook Islands or Tonga). This is a discretionary added layer of planning rather than a substitute for monitoring the official forecast yourself.
El Niño and La Niña: The Variable That Shifts the Averages
The seasonal pattern above describes a typical year, but French Polynesia’s weather is also shaped by the multi-year El Niño-Southern Oscillation (ENSO) cycle, and this matters more for passage planning than many first-time Pacific cruisers expect. During El Niño phases, the South Pacific Convergence Zone and cyclone formation risk can shift closer to French Polynesia than in a typical or La Niña year, and the region has experienced notably active cyclone seasons during strong El Niño years historically. During La Niña phases, trade winds are often stronger and more consistent, but squally, unsettled weather can still interrupt an otherwise favorable window.
The practical takeaway is not to memorize which phase is “safer” — both can produce a difficult season — but to check the current ENSO outlook as part of any pre-season planning, rather than relying purely on the average seasonal pattern described above. This is a genuine year-to-year variable, and a cruiser planning several months ahead should treat the long-range seasonal outlook as one more input, not a guarantee.
Squalls Within an Otherwise Favorable Window
Even a textbook dry-season passage is not necessarily squall-free. Trade wind squalls — localized bursts of wind and rain, sometimes reaching well above the prevailing trade wind strength for a short period — are a normal feature of Pacific passages and are generally distinct from the broader tropical cyclone risk discussed above. They are usually visible on radar and manageable with standard heavy-weather sail-handling practice (reducing sail early, keeping a clear watch), but crews unfamiliar with the Pacific trade wind pattern sometimes underestimate how quickly a squall’s wind speed can build compared to higher-latitude weather systems.
Professional Weather Routing Services
Beyond self-directed grib analysis, a number of professional weather routers work specifically with offshore cruisers on Pacific legs, reviewing a specific boat’s polar performance, timeline, and route to recommend a departure window and any mid-passage course adjustments. This is a discretionary, paid layer of planning most commonly used for the longer or more consequential legs — the Marquesas landfall after a Panama-to-French-Polynesia crossing, or the westward passage toward the Cook Islands or Tonga — rather than for shorter inter-island hops within French Polynesia itself. Names and specific services in this space change over time; the cruiser radio net and other boats already in the region are a good source for current recommendations.
Applying This to Specific Legs
Marquesas to Tahiti (via the Tuamotus): typically sailed May-October for consistent trade winds and lowest cyclone risk. See our Marquesas to Tahiti sailing route guide for the full route breakdown, including the Tuamotu atoll stops along the way.
Tahiti (or Bora Bora) to the Cook Islands: also a dry-season passage for most cruisers, with the added consideration of a genuinely long open-water leg with limited services on arrival. See our Tahiti to Cook Islands sailing route guide for distance, timing, and stopover considerations on that specific crossing.
Tuamotu atoll transits: weather windows matter here as much for sea state at the pass entrances as for the open-water legs between atolls — see our Tuamotu navigation guide for how pass timing interacts with broader weather planning.
Frequently Asked Questions
When is the safest time to sail through French Polynesia?
The May-through-October dry season offers the most consistent trade winds and the lowest tropical cyclone risk, which is why the large majority of cruising traffic through the region is timed to this window. Sailing outside this period is not automatically unsafe, but it does mean accepting materially higher cyclone exposure and less predictable wind patterns.
How far in advance should we start watching weather for a specific passage?
Most cruisers begin tracking grib forecasts and official bulletins roughly a week to ten days before an intended departure, refining the target window as the date approaches. For longer or more exposed legs, some cruisers engage a professional weather router even earlier to help frame realistic options.
Does Météo-France Polynésie forecast specifically for offshore passages, or just coastal areas?
Météo-France Polynésie publishes marine bulletins covering open-water areas around and between the archipelagos, not just nearshore conditions, along with tropical cyclone advisories during the wet season. It is the authoritative source cruisers check first, supplemented by grib-file tools for more granular route planning.
Is it possible to safely sail through French Polynesia during cyclone season?
Some cruisers do stay and cruise cautiously during the wet season, but the prevailing practice among experienced offshore sailors is to complete major open-water legs before the season opens and to arrange secure cyclone-season storage for any vessel remaining in the region. Insurance terms frequently restrict coverage during this window regardless of actual conditions.
What is the difference between a grib file and an official Météo-France forecast?
A grib file is raw numerical model output (typically GFS or ECMWF) visualized by third-party software, useful for trend-spotting several days ahead but not reviewed by a human forecaster. Météo-France Polynésie’s bulletins are prepared and issued by meteorologists with local knowledge of how regional effects modify the raw model output, which is why cruisers treat it as the primary authority rather than the grib file alone.