Which seas and ferry crossings are roughest in March
Of the 202 seas and ferry routes on this site, 76 sit at rough or roughest in March and 22 are calm. 51 are at the hardest level they reach in any month of the year. Against February, 5 step up a level and 98 step down.
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Every water ranked for March
Each level below is the one that water carries for March on its own page. It describes the typical pattern of the month, not a forecast for your sailing date. A water marked as its own worst is at the hardest level it reaches in any month of the year.
Roughest in March: 5 of 202
This water at its hardest. These are the months its reputation comes from, and the ones passengers write about afterwards.
| Sea or route | What drives it | Rest of its year |
|---|---|---|
| Barents SeaSea area, Arctic Norway. Worst level of its year. | Open Arctic water, winter polar lows | high |
| Bristol ChannelSea area, South-west England and Wales. Worst level of its year. | Atlantic swell and a 13 m tidal range | high |
| Drake PassageSea area, Southern Ocean. Worst level of its year. | No land to stop wind, swell or current | very high |
| Strait of BonifacioSea area, Corsica and Sardinia. Worst level of its year. | Mistral squeezed through an 11 km gap | high |
| VestfjordenSea area, Northern Norway. Worst level of its year. | Open bight of sea with strong tidal eddies | high |
Rough in March: 71 of 202
The difficult half of this water's year. Calm days still happen, but bad ones are common enough to plan around.
| Sea or route | What drives it | Rest of its year |
|---|---|---|
| Aberdeen to LerwickFerry route, UK and Ireland | 216 miles up the open northern North Sea | high |
| Alboran SeaSea area, Spain and Morocco. Worst level of its year. | Open water, roughest from winter to spring | moderate |
| Algeciras to CeutaFerry route, Southern Europe. Worst level of its year. | The sheltered-side shortcut | moderate |
| Algeciras to Tanger MedFerry route, Southern Europe. Worst level of its year. | The strait's big-ship crossing | moderate |
| Balearic SeaSea area, Spain. Worst level of its year. | Short fetch, northerly storms and fronts | moderate |
| Bar Harbor to Yarmouth (The CAT)Ferry route, North America. Worst level of its year. | Open Gulf of Maine at catamaran speed | moderate |
| Bay of BiscaySea area, North-east Atlantic | Atlantic swell over a shoaling shelf | high |
| Bay of FundySea area, New Brunswick and Nova Scotia | Record tides, swell against the ebb at Digby Gut | moderate |
| Bay of NaplesSea area, Southern Italy. Worst level of its year. | West-facing bay, autumn and winter storms | moderate |
| Bering SeaSea area, Alaska | Aleutian Low storms over a wide deep basin | very high |
| Block Island SoundSea area, Rhode Island, Connecticut and New York. Worst level of its year. | Open to the Atlantic, southerly fetch | moderate |
| Cabot StraitSea area, Atlantic Canada | Atlantic storm track across an open gulf mouth | high |
| Celtic SeaSea area, Between Ireland, Cornwall and Brittany | Open Atlantic swell over a shelf sea | high |
| Delaware BaySea area, New Jersey and Delaware. Worst level of its year. | Open bay, long fetch and strong currents | moderate |
| Gills Bay to St Margaret's HopeFerry route, UK and Ireland | Straight across the world's fastest tidal streams | very high |
| Gulf of AlaskaSea area, North Pacific | Aleutian Low storms, no island shelter | high |
| Gulf of LionSea area, Western Mediterranean. Worst level of its year. | Mistral funnelled down the Rhône valley | high |
| Gulf of MaineSea area, Maine and Nova Scotia | Open Atlantic gulf, winter gales on a long fetch | high |
| Gulf of Saint-MaloSea area, Between Brittany, Normandy and the Channel Islands | Huge tides and island reefs in the western Channel | moderate |
| Gulf of SalernoSea area, Amalfi Coast, Italy. Worst level of its year. | Wide open Tyrrhenian mouth, winter storms | moderate |
| Harwich to Hook of HollandFerry route, UK and Ireland | The shallowest water on the North Sea ferry map | high |
| Hecate StraitSea area, British Columbia | Shallow strait, steep wind waves, southeast gales | very high |
| Hirtshals to TorshavnFerry route, Northern Europe | A day and a half into the open North Atlantic | high |
| Hull to RotterdamFerry route, UK and Ireland | Overnight across the shallow southern basin | high |
| Ionian SeaSea area, Western Greece and southern Italy | Winter southerlies over deep open water | moderate |
| Lake MichiganSea area, US Midwest | Long fetch under autumn gales | high |
| Lake SuperiorSea area, Great Lakes (Michigan, Minnesota, Wisconsin and Ontario) | Huge fetch over deep water | high |
| Ligurian SeaSea area, North-west Italy and Corsica. Worst level of its year. | Mistral and Gulf of Genoa lows over deep water | moderate |
| Maizuru to OtaruFerry route, Asia | A day at sea along the winter monsoon's fetch | high |
| Malta ChannelSea area, Central Mediterranean. Worst level of its year. | Open channel exposed to north-westerly gales | moderate |
| Marseille to AjaccioFerry route, Southern Europe. Worst level of its year. | Mistral funnelled down the Rhone valley | high |
| Mediterranean SeaSea area, Mediterranean. Worst level of its year. | Mistral in the west, meltemi in the Aegean | moderate |
| Mona PassageSea area, Caribbean. Worst level of its year. | Tidal current forced over shallow banks | moderate |
| Mozambique ChannelSea area, South-west Indian Ocean. Worst level of its year. | Cyclone corridor feeding the Agulhas Current | high |
| Newcastle to AmsterdamFerry route, UK and Ireland | A full night across the open middle | high |
| Niigata to OtaruFerry route, Asia | The shorter Hokkaido run, same winter sea | high |
| Niigata to Ryotsu (Sado Island)Ferry route, Asia | A short hop open to the winter sea | high |
| North SeaSea area, North-west Europe | Shallow basin, short steep wind chop | high |
| North Sydney to ArgentiaFerry route, North America | The long way to Newfoundland, more Atlantic in it | high |
| North Sydney to Port aux BasquesFerry route, North America | The Atlantic storm track's ferry crossing | high |
| Norwegian SeaSea area, Northern Europe | Ocean swell at unsheltered capes | high |
| Pentland FirthSea area, Northern Scotland | Tidal races, not wind-driven waves | very high |
| Penzance to St Mary's (Isles of Scilly)Ferry route, UK and Ireland. Worst level of its year. | Open Atlantic swell met by a flat-bottomed hull | high |
| Plymouth to SantanderFerry route, UK and Ireland | The short cut that still crosses all of Biscay | high |
| Portsmouth to BilbaoFerry route, UK and Ireland | A long offshore middle over open Biscay | high |
| Portsmouth to SantanderFerry route, UK and Ireland | Atlantic swell over a shoaling shelf | high |
| Rosslare to CherbourgFerry route, UK and Ireland. Worst level of its year. | Open Celtic Sea with full Atlantic fetch | high |
| San Juan to Santo DomingoFerry route, Caribbean and Latin America. Worst level of its year. | The Caribbean's trickiest passage, overnight | moderate |
| San Pedro ChannelSea area, Southern California. Worst level of its year. | Open Pacific channel, spring peak | moderate |
| Santa Barbara ChannelSea area, Southern California. Worst level of its year. | Afternoon northwest wind along the islands' north shores | high |
| Saronic GulfSea area, Athens, Greece. Worst level of its year. | Summer meltemi, partly sheltered by Attica | moderate |
| Scrabster to StromnessFerry route, UK and Ireland | Tidal races, not wind-driven waves | very high |
| Sea of JapanSea area, East Asia | Winter monsoon over a long open fetch | high |
| Sea of the HebridesSea area, West coast of Scotland | Partly sheltered sea with Atlantic storms in winter | high |
| Seto Inland SeaSea area, Western Japan. Worst level of its year. | Sheltered inland sea, strong tidal straits | moderate |
| St Lucia ChannelSea area, Eastern Caribbean (Martinique and Saint Lucia) | Trade-wind sea in a gap between islands | moderate |
| St Lucia to Martinique (Castries to Fort-de-France)Ferry route, Caribbean and Latin America. Worst level of its year. | Trade swell funnelling between the islands | moderate |
| Strait of GibraltarSea area, Spain and Morocco. Worst level of its year. | Wind funneled between two mountain ranges | moderate |
| Strait of MessinaSea area, Sicily and Calabria. Worst level of its year. | Opposed tides drive strong currents through a 3 km gap | moderate |
| Straits of MackinacSea area, Northern Michigan. Worst level of its year. | Irregular currents and autumn gales between two lakes | moderate |
| Tarifa to TangierFerry route, Southern Europe. Worst level of its year. | Wind funnelled between two continents | moderate |
| The MinchSea area, North-west Scotland. Worst level of its year. | Atlantic swell down an open northern door | moderate |
| Torshavn to SeydisfjordurFerry route, Northern Europe | High-latitude open ocean, the Iceland leg | high |
| Toulon to BastiaFerry route, Southern Europe. Worst level of its year. | Mistral seas from the gulf's eastern edge | high |
| Trinidad to Tobago (Port of Spain to Scarborough)Ferry route, Caribbean and Latin America. Worst level of its year. | Calm gulf, open Atlantic middle | high |
| Tyrrhenian SeaSea area, Western Italy, Sardinia and Sicily. Worst level of its year. | Winter mistral and libeccio over deep water | moderate |
| Uig to Lochmaddy (North Uist)Ferry route, UK and Ireland. Worst level of its year. | The Uist leg of the Little Minch triangle | moderate |
| Uig to Tarbert (Harris)Ferry route, UK and Ireland. Worst level of its year. | The Little Minch's open crossing to Harris | moderate |
| Ullapool to StornowayFerry route, UK and Ireland. Worst level of its year. | Atlantic swell down an open northern door | moderate |
| Vieques SoundSea area, Puerto Rico. Worst level of its year. | Steady trade winds over a long fetch, shoals in the west | moderate |
| Whitsunday PassageSea area, Queensland, Australia. Worst level of its year. | Wind across the gap to the islands | moderate |
Mixed in March: 104 of 202
It depends on the week. Settled weather gives an easy passage here, an approaching front gives an uncomfortable one.
| Sea or route | What drives it | Rest of its year |
|---|---|---|
| Adriatic SeaSea area, Central Mediterranean | Katabatic bora gusts off the Dinaric Alps | moderate |
| Aegean SeaSea area, Eastern Mediterranean | Summer meltemi funnelled down the Aegean | moderate |
| Ancona to IgoumenitsaFerry route, Southern Europe | Running the whole Adriatic, north to south | moderate |
| Ancona to SplitFerry route, Southern Europe | Overnight across the open central Adriatic | moderate |
| Baltic SeaSea area, Northern Europe | Short steep chop, no ocean swell | moderate |
| Barcelona to Palma de MallorcaFerry route, Southern Europe | Tramontana and mistral chop on an open crossing | moderate |
| Bari to DubrovnikFerry route, Southern Europe | The deep southern Adriatic basin | moderate |
| Bass StraitSea area, Southern Australia | Ocean swell shortening over a 60 m shelf | high |
| Bay of IslandsSea area, Northland, New Zealand | Open Pacific at Cape Brett, islands inside | moderate |
| Bluff to Oban (Stewart Island)Ferry route, Australia and New Zealand | Roaring Forties swell over a shallow seaway | very high |
| Buenos Aires to Colonia del SacramentoFerry route, Caribbean and Latin America. Worst level of its year. | A shallow brown-water estuary with one bad wind | low |
| Busan to Hakata (Fukuoka)Ferry route, Asia | The overnight strait, after the fast craft era | moderate |
| Busan to OsakaFerry route, Asia | One open strait, then Japan's inland sea | moderate |
| Busan to ShimonosekiFerry route, Asia | The historic overnight run across the strait | moderate |
| Cairnryan to BelfastFerry route, UK and Ireland | Atlantic weather funnelled through the North Channel | moderate |
| Cape May to LewesFerry route, North America. Worst level of its year. | Where Atlantic swell meets the estuary | moderate |
| Cebu StraitSea area, Philippines | Island channel, rougher in monsoons and typhoons | moderate |
| Ceiba to Vieques and CulebraFerry route, Caribbean and Latin America. Worst level of its year. | Trade-wind chop across an island sound | moderate |
| Civitavecchia to OlbiaFerry route, Southern Europe | Open Tyrrhenian in the mistral's throw | moderate |
| Cook StraitSea area, New Zealand | Wind against a 5-knot tidal stream | high |
| Copenhagen to OsloFerry route, Northern Europe | Sheltered start, open Skagerrak in the night | moderate |
| Coral SeaSea area, South-west Pacific | Trade-wind chop behind a reef screen | moderate |
| Dar es Salaam to ZanzibarFerry route, Africa | Indian Ocean swell across an open channel | moderate |
| Denia to IbizaFerry route, Southern Europe | Fast catamarans on an open Balearic hop | moderate |
| Dover to CalaisFerry route, UK and Ireland | Shallow strait, wind against tide | moderate |
| Dover to DunkirkFerry route, UK and Ireland | Shallow strait, wind against tide | moderate |
| East China SeaSea area, Southern Japan | Typhoons and fronts over a shallow sea | high |
| English ChannelSea area, North-west Europe | Shallow strait, wind against tide | moderate |
| Fishguard to RosslareFerry route, UK and Ireland | Strong tides meeting open Celtic Sea swell | moderate |
| Flores SeaSea area, Eastern Indonesia | Fast currents in the island channels | moderate |
| Fort Lauderdale to BiminiFerry route, North America | Wind against the Gulf Stream's current | moderate |
| Fort Myers Beach to Key West (Key West Express)Ferry route, North America | A long open-Gulf run at speed | moderate |
| Foveaux StraitSea area, Southern New Zealand | Roaring Forties swell over a shallow seaway | very high |
| Galway BaySea area, West of Ireland | Atlantic swell entering through the Aran sounds | moderate |
| Geelong to Devonport (Spirit of Tasmania)Ferry route, Australia and New Zealand | Ocean swell shortening over a 60 m shelf | high |
| German BightSea area, North Sea coast of Germany | Shallow open bight with tidal channels | high |
| Great Australian BightSea area, Southern Australia | Southern Ocean swell with unlimited fetch | high |
| Gulf of CaliforniaSea area, Mexico | Long, deep gulf, brief chubasco storms | moderate |
| Gulf of FinlandSea area, Finland and Estonia | Narrow gulf, wind along its axis | moderate |
| Gulf of MexicoSea area, North America | Winter northers behind cold fronts | moderate |
| Gulf of PenasSea area, Chilean Patagonia | Open Pacific, westerly storms | very high |
| Heysham to DouglasFerry route, UK and Ireland | The year-round workhorse across open water | moderate |
| Hirtshals to KristiansandFerry route, Northern Europe | North Sea swell funnelled into the Skagerrak | moderate |
| Hirtshals to LarvikFerry route, Northern Europe | The longer diagonal across the open Skagerrak | moderate |
| Holyhead to DublinFerry route, UK and Ireland | Wind against strong tidal streams | moderate |
| Hyannis to NantucketFerry route, North America | Shallow sound chop under fast catamarans | moderate |
| Inside PassageSea area, North Pacific. Worst level of its year. | Island shelter, except at its open crossings | moderate |
| Irish SeaSea area, British Isles | Wind against strong tidal streams | moderate |
| Jeju StraitSea area, South Korea | Winter wind over a strait between two seas | high |
| KattegatSea area, Denmark and Sweden | Shallow sea with tiny tides | moderate |
| Korea StraitSea area, East Asia | Monsoon chop over a shallow shelf | moderate |
| Lake HuronSea area, Great Lakes (Ontario and Michigan) | Open fetch, winds from any quarter | high |
| Liverpool to BelfastFerry route, UK and Ireland | The long diagonal of the Irish Sea | moderate |
| Liverpool to DouglasFerry route, UK and Ireland | Open Irish Sea, two very different hulls | moderate |
| Long Beach to Catalina IslandFerry route, North America | Pacific ground swell under fast hulls | moderate |
| Long Island SoundSea area, New York and Connecticut | Sheltered sound, long east-west fetch | moderate |
| Monterey BaySea area, Central California | Winter storms and swell in an open bight | moderate |
| Moreton BaySea area, Brisbane, Australia | Shallow bay behind sand islands, wind chop | moderate |
| Mykonos to SantoriniFerry route, Southern Europe | Beam-on to the meltemi in small fast craft | high |
| Nantucket SoundSea area, Cape Cod, Massachusetts. Worst level of its year. | Winter gales over shoal-filled water | moderate |
| Naples to CapriFerry route, Southern Europe. Worst level of its year. | Small fast hulls on an open bay approach | moderate |
| Naples to PalermoFerry route, Southern Europe | A full-length open Tyrrhenian night | moderate |
| Newhaven to DieppeFerry route, UK and Ireland | Open mid-Channel, longer in the swell | moderate |
| Nice to BastiaFerry route, Southern Europe | Open Ligurian Sea on fast hulls | moderate |
| Oslo to KielFerry route, Northern Europe | Big ships, one open strait in the middle | moderate |
| Pembroke to RosslareFerry route, UK and Ireland | The longer diagonal across St George's Channel | moderate |
| Pillsbury SoundSea area, US Virgin Islands | Trade-wind chop in a small sound | moderate |
| Piraeus to Heraklion (Crete)Ferry route, Southern Europe | The full meltemi fetch, slept through on big ships | moderate |
| Piraeus to MykonosFerry route, Southern Europe | Open central Aegean in the meltemi's lane | moderate |
| Piraeus to SantoriniFerry route, Southern Europe | The long run down the meltemi's fetch | moderate |
| Playa del Carmen to CozumelFerry route, Caribbean and Latin America | Wind against the Yucatan current | moderate |
| Plymouth to RoscoffFerry route, UK and Ireland | The Channel's open Atlantic doorway | moderate |
| Point Judith to Block IslandFerry route, North America | A short hop open to Atlantic swell | moderate |
| Poole to CherbourgFerry route, UK and Ireland | Open mid-Channel on the beam | moderate |
| Port Angeles to Victoria (MV Coho)Ferry route, North America | Straight across the Pacific's doorway | moderate |
| Portsmouth to CaenFerry route, UK and Ireland | Long open leg across the central Channel | moderate |
| Portsmouth to St MaloFerry route, UK and Ireland | The longest Channel crossing, slept through | moderate |
| Prince William SoundSea area, South-central Alaska | Sheltered fjords, Gulf swell at the entrance | moderate |
| Resurrection BaySea area, Southcentral Alaska | Sheltered fjord, open Gulf of Alaska swell beyond | moderate |
| Rottnest ChannelSea area, Western Australia | Open-shelf swell, summer sea breeze | moderate |
| Saint John to Digby (Fundy Rose)Ferry route, North America. Worst level of its year. | The world's biggest tides, mostly behaving | moderate |
| Salish SeaSea area, North Pacific. Worst level of its year. | Mountain-sheltered basins, one strait open to the Pacific | moderate |
| San Francisco BaySea area, Northern California | Funneled summer sea breeze and tidal swirls | moderate |
| Sea of ÅlandSea area, Sweden and the Åland Islands | Deep basin joined to the open Baltic | moderate |
| Seattle to Victoria (Victoria Clipper)Ferry route, North America | Two sheltered hours, one open strait | moderate |
| Singapore StraitSea area, South-east Asia | Sheltered strait, monsoon wind chop | moderate |
| Sir Francis Drake ChannelSea area, British Virgin Islands | Steady trade winds between islands | moderate |
| SkagerrakSea area, Scandinavia | North Sea swell funneled into a narrowing strait | moderate |
| South China SeaSea area, Southeast Asia | Northeast monsoon wind over a deep, open sea | high |
| Split to HvarFerry route, Southern Europe | Island-sheltered channel, bora-day exception | moderate |
| St George's ChannelSea area, Wales and Ireland | Channel linking the Celtic Sea and the Irish Sea | high |
| Stockholm to HelsinkiFerry route, Northern Europe | Archipelago shelter, one open Baltic gap | moderate |
| Stockholm to TallinnFerry route, Northern Europe | The open Baltic Proper in the middle of the night | moderate |
| Strait of MagellanSea area, Southern Chile | Narrows, strong tide and wind | high |
| Sydney HarbourSea area, New South Wales, Australia | Harbour with an open ocean entrance | moderate |
| Table BaySea area, South Africa | Open to the north-west, winter storm waves | moderate |
| Taiwan StraitSea area, Taiwan | Northeast monsoon over a shallow strait | high |
| Tasman SeaSea area, South-west Pacific | 2,000 km of unbroken westerly fetch | high |
| Tsugaru StraitSea area, Japan | Winter monsoon seas into a 20 km gap | high |
| Valletta to Pozzallo (Malta to Sicily)Ferry route, Southern Europe | An open channel crossed at 38 knots | moderate |
| Verde Island PassageSea area, Philippines | Two monsoons and a typhoon season | moderate |
| Vineyard SoundSea area, Cape Cod, Massachusetts. Worst level of its year. | Wind against tidal current at West Chop | moderate |
| Wadden SeaSea area, Netherlands, Germany and Denmark | Sheltered tidal flats, wind-driven chop | moderate |
| Wellington to PictonFerry route, Australia and New Zealand | 75 exposed minutes in a wind funnel | high |
Calm in March: 22 of 202
The settled end of this water's year, when most passages pass without much motion worth noticing.
| Sea or route | What drives it | Rest of its year |
|---|---|---|
| Andaman SeaSea area, Thailand and the Andaman Islands | Monsoon winds over deep open water | moderate |
| Auckland to Waiheke IslandFerry route, Australia and New Zealand | An island-sheltered gulf commute | low |
| Backstairs PassageSea area, South Australia | Narrow tidal channel, Southern Ocean wind | high |
| Bali (Padangbai) to Gili TrawanganFerry route, Asia | Deep strait currents under small fast boats | high |
| Caribbean SeaSea area, Caribbean | Trade winds, winter surges and hurricane season | moderate |
| Chumphon to Koh TaoFerry route, Asia | Gulf chop on the opposite monsoon calendar | moderate |
| Gulf of St. LawrenceSea area, Eastern Canada | Open gulf, autumn wind waves, winter ice | high |
| Gulf of ThailandSea area, South-east Asia | Shallow gulf, monsoon wind chop | moderate |
| Ha Long BaySea area, Northern Vietnam | Island-shielded bay, storm-season closures | moderate |
| Hauraki GulfSea area, New Zealand | Protected gulf, exposed to north winds | moderate |
| Helsinki to TallinnFerry route, Northern Europe | A short hop on outsized ships | low |
| Hong Kong to MacauFerry route, Asia | An estuary that opens to the South China Sea | moderate |
| Lake ErieSea area, Great Lakes (Ohio and Ontario) | Shallow lake, seas build fast | high |
| Pearl River EstuarySea area, Southern China | Shallow estuary, monsoon wind and typhoons | moderate |
| Phuket to Koh Phi PhiFerry route, Asia | A 45 km open Andaman crossing with two seasons | moderate |
| Puttgarden to RodbyFerry route, Northern Europe | A 45 minute belt hop with land in sight | low |
| Seattle to Bainbridge IslandFerry route, North America | The sheltered sound's flagship commute | low |
| Strait of MalaccaSea area, Malaysia and Indonesia | Sheltered strait with Sumatra squalls | moderate |
| Turku to StockholmFerry route, Northern Europe | One of Europe's calmest long ferry rides | low |
| Vancouver (Tsawwassen) to Victoria (Swartz Bay)Ferry route, North America | Open strait first, island maze after | low |
| Woods Hole to Martha's VineyardFerry route, North America | The shorter, more sheltered island run | low |
| Zanzibar ChannelSea area, East Africa | Open Indian Ocean channel, monsoon winds | moderate |
How March compares with the months either side
Coming out of February, 5 of these waters move up a level and 98 move down. The rest hold where they were. Roughness does not switch on in one month: most of these waters shift a step at a time, which is why the shoulder months either side of a bad season are often the useful booking window.
The two hemispheres also run opposite. A month at the calm end of the year in the North Atlantic is the hard end of it in the Southern Ocean, so a single month page holds both a list of waters to avoid and a list to book.
Sailing somewhere on this list in March?
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Levels on this page are the typical seasonal patterns published on each sea and route page, drawn from marine and operator information as of September 2026. They are not forecasts. Route and operator names are trademarks of their respective owners; Dizzout is not affiliated with or endorsed by them. This page is informational and not medical advice.