15 of the World’s Roughest Seas and Passages Cruise Ships Cross

Some famous cruise routes cross open water where wind, current, and distant storms can produce a lively ride.

Here is why these passages get rough and what passengers can do before the ship starts moving.

1. Drake Passage, South America to Antarctica

The Drake Passage has a long stretch of open water between Cape Horn and Antarctica. Strong Southern Ocean winds can build large swells without a continent blocking their path.

Expedition ships usually cross it on voyages from Ushuaia, often during the austral summer. A calm “Drake Lake” is possible, but forecasts can still change quickly.

Pack medicine approved by your clinician, eat lightly, and keep the first sea day flexible.

2. Bay of Biscay, France and Spain

The Bay of Biscay is exposed to Atlantic low-pressure systems and long ocean swell. Wind waves can meet older swell from another direction, which makes the motion feel less regular.

Cruises between Britain and Iberia often cross the bay, with autumn and winter bringing a greater chance of strong systems. Calm crossings occur in every season.

Choose a lower, central cabin and secure bottles before bedtime.

3. Agulhas Waters, South Africa

The Agulhas Current carries warm water southwest along South Africa. When a strong opposing wind arrives, the current can shorten the waves and make them steeper.

Africa cruises and world voyages meet these waters around Durban, Gqeberha, and Cape Town. Cold fronts are an important forecast factor, especially outside the calmer summer windows.

Check the daily program early and avoid a heavy dinner before exposed sea time.

4. North Atlantic South of Iceland

The North Atlantic south of Iceland sits on a busy storm track. Winter low-pressure systems create strong winds, while swell can continue long after the nearby sky looks calmer.

Transatlantic repositioning voyages and Iceland itineraries spend extended time in this open region. Late fall through early spring generally brings more wave energy than summer.

Keep one hand free on stairs and use the handrails when the ship moves.

5. Tasman Sea, Australia and New Zealand

The Tasman Sea receives swell from Southern Ocean storms and weather systems that form closer to Australia and New Zealand. Waves can arrive from more than one direction.

Australia to New Zealand cruises often schedule two or more sea days across this water. Conditions vary all year, and ex-tropical cyclones can also affect the region in warmer months.

Bring a light layer, water, and a motion-sickness kit in your carry-on.

6. Gulf of Alaska

Deep low-pressure systems can slow and strengthen over the Gulf of Alaska. Long Pacific fetch then gives wind time to build broad swell, while colder air can create steeper local waves.

One-way Alaska cruises cross the gulf between glacier ports and Seward or Whittier. Summer is the main cruise season, but unsettled days still occur.

Review these Alaska cruise mistakes, then keep rain gear and medicine accessible.

7. Norwegian Sea

Atlantic lows travel into the Norwegian Sea, and winter cold-air outbreaks can form compact polar lows. Both patterns can produce fast changes in wind and sea state.

Norway, Svalbard, and North Cape cruises use parts of this sea. Most leisure sailings favor summer, but shoulder-season weather can still turn quickly.

Pack from the international travel essentials people often forget, including a warm layer for an indoor evacuation drill.

8. North Sea

The North Sea is shallower than the open Atlantic, so wind can create short, steep waves that feel busy rather than smooth. Autumn and winter have the roughest long-term pattern, especially in the north.

Cruises from Britain, Germany, and the Netherlands cross it on routes to Norway and northern Europe.

If outdoor plans close, avoid common cruise time wasters by checking the revised program before breakfast.

9. Bass Strait, Australia

Bass Strait is shallow, exposed, and crossed by strong weather changes. The Australian Bureau of Meteorology notes that opposing tidal currents can increase wave steepness.

Tasmania cruises and voyages between Melbourne and New Zealand often use the strait. Strong fronts can arrive in any month, although each crossing has its own forecast.

Veterans debate many cruise habits, but sensible shoes and handrails help on every moving deck.

10. Cook Strait, New Zealand

Cook Strait funnels wind between New Zealand’s two main islands. The strait has some shelter from ocean swell, but strong local winds can quickly build short, choppy seas.

Cruise ships pass through or near it when calling at Wellington and moving between North and South Island ports.

Before the rough section, follow these cruise cabin safety reminders and move loose glassware away from edges.

11. Mona Passage, Puerto Rico and the Dominican Republic

The Mona Passage connects the Atlantic and Caribbean between Puerto Rico and Hispaniola. Trade winds, tidal flow, and incoming Atlantic swell can combine into short, uneven motion.

Eastern Caribbean cruises may cross the passage near San Juan or the Dominican Republic. Winter swell and summer squalls can both matter, but quiet days are common.

When comparing Caribbean cruise ports, also check how much open water sits between calls.

12. South China Sea

Seasonal monsoons can drive persistent wind across the South China Sea for several days. Tropical cyclones can also send swell far beyond the storm’s immediate center.

Regional cruises connect Hong Kong, Vietnam, Singapore, and nearby ports across this basin. The northeast monsoon matters in winter, while tropical weather needs attention in warmer months.

Use these pre-cruise port-city ideas to arrive before weather disrupts a same-day connection.

13. Aegean Sea, Greece

The Aegean’s seasonal northerly winds, often called Etesians or Meltemi, can raise whitecaps across the channels between Greek islands. Island terrain also changes the wind from one passage to the next.

Greek island cruises operate heavily in summer, which is also when these northerly winds are familiar.

Compare the route with these European cruise destinations, then leave buffer time for tender or port changes.

14. Gulf of Lion, France

The Mistral and Tramontane can funnel strong wind toward the Gulf of Lion. The result can be steep local waves beneath a sky that looks bright and clear.

Western Mediterranean cruises encounter this area near Marseille, Provence, and the Spanish border. Wind events are possible beyond winter, so sunshine alone is not a sea-state forecast.

First-time passengers can avoid more cruise rookie errors by reading notices before leaving the cabin.

15. Strait of Magellan, Chile

The Strait of Magellan is more sheltered than the nearby Drake Passage, but Patagonian wind can change direction and strength with little warning. Tidal currents also accelerate through its narrows.

South America and expedition itineraries use the strait near Punta Arenas. Summer is still windy, while colder months bring more frontal weather.

Avoid these cruise cabin mistakes, and keep the floor clear before a gusty overnight transit.

Sources

• Australian Antarctic Program: Winds, waves and temperatures (Drake Passage and Southern Ocean wind patterns)
• UK Marine Accident Investigation Branch: Spirit of Discovery report (Bay of Biscay weather and sea conditions)
• NOAA National Data Buoy Center: Sea State Forecasting (Agulhas waters and Gulf of Alaska)
• NOAA Science On a Sphere: Wave Heights 2012 (seasonal North Atlantic and Southern Ocean wave patterns)
• Earth Sciences New Zealand and NIWA: Wave action (Tasman Sea exposure and Cook Strait wind waves)
• NOAA U.S. Coast Pilot 9 (Gulf of Alaska seasonal storms and waves)
• Norwegian Meteorological Institute: Weather phenomena that can trigger warnings (Norwegian Sea polar lows and winter marine conditions)
• UK Government: North Sea offshore waves and currents (North Sea seasonal wave climate)
• Australian Bureau of Meteorology: Wave height forecasts (Bass Strait wave steepness and tidal currents)
• NOAA U.S. Coast Pilot 5, Chapter 13 (Mona Passage currents, winds, and squalls)
• Hong Kong Observatory: The Strong Monsoon Signal (South China Sea monsoon winds and rough seas)
• Hellenic National Meteorological Service: Climate of Greece (seasonal Aegean northerly winds)
• Météo-France: Le mistral, vent régional (Mistral and Tramontane wind regions)
• Chilean Maritime Authority: Pilotage in the Strait of Magellan (winds, currents, narrows, and seasonal navigation conditions)