Which seas and ferry crossings are roughest in October
Of the 202 seas and ferry routes on this site, 66 sit at rough or roughest in October and 29 are calm. 39 are at the hardest level they reach in any month of the year. Against September, 83 step up a level and 21 step down.
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Every water ranked for October
Each level below is the one that water carries for October 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 October: 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 |
|---|---|---|
| Bering SeaSea area, Alaska. Worst level of its year. | Aleutian Low storms over a wide deep basin | very high |
| Cook StraitSea area, New Zealand. Worst level of its year. | Wind against a 5-knot tidal stream | high |
| Drake PassageSea area, Southern Ocean. Worst level of its year. | No land to stop wind, swell or current | very high |
| Lake MichiganSea area, US Midwest. Worst level of its year. | Long fetch under autumn gales | high |
| Wellington to PictonFerry route, Australia and New Zealand. Worst level of its year. | 75 exposed minutes in a wind funnel | high |
Rough in October: 61 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 |
| Backstairs PassageSea area, South Australia. Worst level of its year. | Narrow tidal channel, Southern Ocean wind | high |
| Barents SeaSea area, Arctic Norway | Open Arctic water, winter polar lows | high |
| Bass StraitSea area, Southern Australia | Ocean swell shortening over a 60 m shelf | high |
| Bay of BiscaySea area, North-east Atlantic | Atlantic swell over a shoaling shelf | high |
| Bluff to Oban (Stewart Island)Ferry route, Australia and New Zealand | Roaring Forties swell over a shallow seaway | very high |
| Cabot StraitSea area, Atlantic Canada | Atlantic storm track across an open gulf mouth | high |
| Caribbean SeaSea area, Caribbean. Worst level of its year. | Trade winds, winter surges and hurricane season | moderate |
| Copenhagen to OsloFerry route, Northern Europe. Worst level of its year. | Sheltered start, open Skagerrak in the night | moderate |
| East China SeaSea area, Southern Japan. Worst level of its year. | Typhoons and fronts over a shallow sea | high |
| Foveaux StraitSea area, Southern New Zealand | Roaring Forties swell over a shallow seaway | very high |
| 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 |
| Gills Bay to St Margaret's HopeFerry route, UK and Ireland | Straight across the world's fastest tidal streams | very high |
| Great Australian BightSea area, Southern Australia | Southern Ocean swell with unlimited fetch | high |
| Gulf of AlaskaSea area, North Pacific | Aleutian Low storms, no island shelter | high |
| Gulf of FinlandSea area, Finland and Estonia. Worst level of its year. | Narrow gulf, wind along its axis | moderate |
| Gulf of MexicoSea area, North America. Worst level of its year. | Winter northers behind cold fronts | moderate |
| Gulf of St. LawrenceSea area, Eastern Canada | Open gulf, autumn wind waves, winter ice | high |
| Harwich to Hook of HollandFerry route, UK and Ireland | The shallowest water on the North Sea ferry map | high |
| Hauraki GulfSea area, New Zealand. Worst level of its year. | Protected gulf, exposed to north winds | moderate |
| Hecate StraitSea area, British Columbia | Shallow strait, steep wind waves, southeast gales | very high |
| Hirtshals to KristiansandFerry route, Northern Europe. Worst level of its year. | North Sea swell funnelled into the Skagerrak | moderate |
| Hirtshals to LarvikFerry route, Northern Europe. Worst level of its year. | The longer diagonal across the open Skagerrak | moderate |
| 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 |
| KattegatSea area, Denmark and Sweden. Worst level of its year. | Shallow sea with tiny tides | moderate |
| Lake ErieSea area, Great Lakes (Ohio and Ontario). Worst level of its year. | Shallow lake, seas build fast | high |
| Lake HuronSea area, Great Lakes (Ontario and Michigan). Worst level of its year. | Open fetch, winds from any quarter | high |
| Lake SuperiorSea area, Great Lakes (Michigan, Minnesota, Wisconsin and Ontario) | Huge fetch over deep water | high |
| Maizuru to OtaruFerry route, Asia | A day at sea along the winter monsoon's fetch | high |
| Moreton BaySea area, Brisbane, Australia. Worst level of its year. | Shallow bay behind sand islands, wind chop | moderate |
| 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 |
| Oslo to KielFerry route, Northern Europe. Worst level of its year. | Big ships, one open strait in the middle | moderate |
| 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 |
| Resurrection BaySea area, Southcentral Alaska. Worst level of its year. | Sheltered fjord, open Gulf of Alaska swell beyond | moderate |
| Rosslare to CherbourgFerry route, UK and Ireland. Worst level of its year. | Open Celtic Sea with full Atlantic fetch | high |
| 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 |
| SkagerrakSea area, Scandinavia. Worst level of its year. | North Sea swell funneled into a narrowing strait | moderate |
| Strait of MagellanSea area, Southern Chile. Worst level of its year. | Narrows, strong tide and wind | high |
| 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 |
| 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 |
| 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 |
| VestfjordenSea area, Northern Norway | Open bight of sea with strong tidal eddies | high |
| Wadden SeaSea area, Netherlands, Germany and Denmark. Worst level of its year. | Sheltered tidal flats, wind-driven chop | moderate |
Mixed in October: 107 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 |
| Algeciras to CeutaFerry route, Southern Europe | The sheltered-side shortcut | moderate |
| Algeciras to Tanger MedFerry route, Southern Europe | The strait's big-ship crossing | 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 |
| Andaman SeaSea area, Thailand and the Andaman Islands | Monsoon winds over deep open water | moderate |
| Balearic SeaSea area, Spain | Short fetch, northerly storms and fronts | moderate |
| Bali (Padangbai) to Gili TrawanganFerry route, Asia | Deep strait currents under small fast boats | high |
| Baltic SeaSea area, Northern Europe | Short steep chop, no ocean swell | moderate |
| Bar Harbor to Yarmouth (The CAT)Ferry route, North America | Open Gulf of Maine at catamaran speed | 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 |
| 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 | West-facing bay, autumn and winter storms | moderate |
| Block Island SoundSea area, Rhode Island, Connecticut and New York | Open to the Atlantic, southerly fetch | moderate |
| Bristol ChannelSea area, South-west England and Wales | Atlantic swell and a 13 m tidal range | 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 |
| Celtic SeaSea area, Between Ireland, Cornwall and Brittany | Open Atlantic swell over a shelf sea | high |
| Chumphon to Koh TaoFerry route, Asia | Gulf chop on the opposite monsoon calendar | moderate |
| Civitavecchia to OlbiaFerry route, Southern Europe | Open Tyrrhenian in the mistral's throw | moderate |
| Coral SeaSea area, South-west Pacific | Trade-wind chop behind a reef screen | moderate |
| Delaware BaySea area, New Jersey and Delaware | Open bay, long fetch and strong currents | 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 |
| 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 |
| 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 |
| Galway BaySea area, West of Ireland | Atlantic swell entering through the Aran sounds | moderate |
| Gulf of CaliforniaSea area, Mexico | Long, deep gulf, brief chubasco storms | moderate |
| Gulf of LionSea area, Western Mediterranean | Mistral funnelled down the Rhรดne valley | high |
| Gulf of MaineSea area, Maine and Nova Scotia | Open Atlantic gulf, winter gales on a long fetch | high |
| Gulf of PenasSea area, Chilean Patagonia | Open Pacific, westerly storms | very 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 | Wide open Tyrrhenian mouth, winter storms | moderate |
| Helsinki to TallinnFerry route, Northern Europe. Worst level of its year. | A short hop on outsized ships | low |
| Heysham to DouglasFerry route, UK and Ireland | The year-round workhorse across open water | moderate |
| Holyhead to DublinFerry route, UK and Ireland | Wind against strong tidal streams | moderate |
| Hong Kong to MacauFerry route, Asia | An estuary that opens to the South China Sea | 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 |
| Ionian SeaSea area, Western Greece and southern Italy | Winter southerlies over deep open water | 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 |
| Korea StraitSea area, East Asia | Monsoon chop over a shallow shelf | moderate |
| Ligurian SeaSea area, North-west Italy and Corsica | Mistral and Gulf of Genoa lows over deep water | moderate |
| 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 |
| Malta ChannelSea area, Central Mediterranean | Open channel exposed to north-westerly gales | moderate |
| Marseille to AjaccioFerry route, Southern Europe | Mistral funnelled down the Rhone valley | high |
| Mediterranean SeaSea area, Mediterranean | Mistral in the west, meltemi in the Aegean | moderate |
| Mona PassageSea area, Caribbean | Tidal current forced over shallow banks | moderate |
| Monterey BaySea area, Central California | Winter storms and swell in an open bight | 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 |
| Norwegian SeaSea area, Northern Europe | Ocean swell at unsheltered capes | high |
| Pearl River EstuarySea area, Southern China | Shallow estuary, monsoon wind and typhoons | moderate |
| Pembroke to RosslareFerry route, UK and Ireland | The longer diagonal across St George's Channel | moderate |
| Phuket to Koh Phi PhiFerry route, Asia | A 45 km open Andaman crossing with two seasons | 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 |
| 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 Juan to Santo DomingoFerry route, Caribbean and Latin America | The Caribbean's trickiest passage, overnight | moderate |
| Saronic GulfSea area, Athens, Greece | Summer meltemi, partly sheltered by Attica | moderate |
| Sea of ร landSea area, Sweden and the ร land 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 |
| 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 BonifacioSea area, Corsica and Sardinia | Mistral squeezed through an 11 km gap | high |
| Strait of GibraltarSea area, Spain and Morocco | Wind funneled between two mountain ranges | moderate |
| Strait of MalaccaSea area, Malaysia and Indonesia | Sheltered strait with Sumatra squalls | moderate |
| Strait of MessinaSea area, Sicily and Calabria | Opposed tides drive strong currents through a 3 km gap | moderate |
| Straits of MackinacSea area, Northern Michigan | Irregular currents and autumn gales between two lakes | moderate |
| Table BaySea area, South Africa | Open to the north-west, winter storm waves | moderate |
| Tarifa to TangierFerry route, Southern Europe | Wind funnelled between two continents | moderate |
| Toulon to BastiaFerry route, Southern Europe | Mistral seas from the gulf's eastern edge | high |
| Tsugaru StraitSea area, Japan | Winter monsoon seas into a 20 km gap | high |
| Tyrrhenian SeaSea area, Western Italy, Sardinia and Sicily | Winter mistral and libeccio over deep water | moderate |
| Valletta to Pozzallo (Malta to Sicily)Ferry route, Southern Europe | An open channel crossed at 38 knots | moderate |
| Vieques SoundSea area, Puerto Rico | Steady trade winds over a long fetch, shoals in the west | moderate |
| Vineyard SoundSea area, Cape Cod, Massachusetts. Worst level of its year. | Wind against tidal current at West Chop | moderate |
Calm in October: 29 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 |
|---|---|---|
| Alboran SeaSea area, Spain and Morocco | Open water, roughest from winter to spring | moderate |
| Auckland to Waiheke IslandFerry route, Australia and New Zealand | An island-sheltered gulf commute | low |
| Bay of IslandsSea area, Northland, New Zealand | Open Pacific at Cape Brett, islands inside | moderate |
| Cebu StraitSea area, Philippines | Island channel, rougher in monsoons and typhoons | moderate |
| Ceiba to Vieques and CulebraFerry route, Caribbean and Latin America | Trade-wind chop across an island sound | moderate |
| Dar es Salaam to ZanzibarFerry route, Africa | Indian Ocean swell across an open channel | moderate |
| Flores SeaSea area, Eastern Indonesia | Fast currents in the island channels | moderate |
| 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 |
| Mozambique ChannelSea area, South-west Indian Ocean | Cyclone corridor feeding the Agulhas Current | high |
| Pillsbury SoundSea area, US Virgin Islands | Trade-wind chop in a small sound | moderate |
| Puttgarden to RodbyFerry route, Northern Europe | A 45 minute belt hop with land in sight | low |
| San Francisco BaySea area, Northern California | Funneled summer sea breeze and tidal swirls | moderate |
| San Pedro ChannelSea area, Southern California | Open Pacific channel, spring peak | moderate |
| Santa Barbara ChannelSea area, Southern California | Afternoon northwest wind along the islands' north shores | high |
| Seattle to Bainbridge IslandFerry route, North America | The sheltered sound's flagship commute | low |
| 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 |
| South China SeaSea area, Southeast Asia | Northeast monsoon wind over a deep, open sea | high |
| 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 | Trade swell funnelling between the islands | moderate |
| Sydney HarbourSea area, New South Wales, Australia | Harbour with an open ocean entrance | moderate |
| Trinidad to Tobago (Port of Spain to Scarborough)Ferry route, Caribbean and Latin America | Calm gulf, open Atlantic middle | high |
| 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 |
| Verde Island PassageSea area, Philippines | Two monsoons and a typhoon season | moderate |
| Whitsunday PassageSea area, Queensland, Australia | Wind across the gap to the islands | moderate |
| 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 October compares with the months either side
Coming out of September, 83 of these waters move up a level and 21 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 October?
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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.