Is the Strait of Magellan rough? What to expect on the crossing
Often, and wind and tide are the reasons. Wikipedia says the strait is difficult to navigate because of frequent narrows and unpredictable winds and currents. TABSA's Punta Arenas to Porvenir ferry takes about 2 hours and says the time is subject to weather.
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Strait · Southern Chile · Reputation among passengers: has a long-standing reputation for rough passages.
- Low
- Moderate
- High
- Very high
Roughness summarises typical reported conditions for this crossing, not a forecast for any given sailing.
Narrows, strong tide and wind
In the Nausea Index table of the 121 sea crossings we cover, the Strait of Magellan is rated rough, one of 34 in that band, with 6 rated higher. Full table: the roughest sea crossings, ranked.
Key facts
- The Strait of Magellan is a strait, and passenger reports place it in the high roughness band.
- The mechanism behind that reputation: Narrows, strong tide and wind.
- Conditions are reported roughest in October, November and December.
- The calmest months are usually May, June and July.
- It is also known as Estrecho de Magallanes.
Why is the Strait of Magellan so rough?
The strait is up to 570 km long and narrows to 2 km at its minimum width. At the Primera Angostura, Spanish Wikipedia says tides reach 10 m and drive a current of up to 8 knots through the passage. Australis lists average winds of 30 to 60 km/h on its itinerary from Punta Arenas.
When is the Strait of Magellan roughest?
Wind reanalysis (ERA5, 2015 to 2024) puts the windiest months at October to December, with an average daily peak wind near 19 knots, and the calmest at May to July, near 14 to 15 knots. At the Primera Angostura cell, winds of 28 knots or more reach about 14 to 15 percent of days in October and November, against about 2 percent in May and June. Wikipedia describes summers in Tierra del Fuego as very windy.
| Roughest water in Jan | Roughest water in Feb | Roughest water in Mar | Roughest water in Apr | Roughest water in May | Roughest water in Jun | Roughest water in Jul | Roughest water in Aug | Roughest water in Sep | Roughest water in Oct | Roughest water in Nov | Roughest water in Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mixed | Mixed | Mixed | Mixed | Calm | Calm | Calm | Mixed | Mixed | Rough | Rough | Rough |
Typical seasonal pattern, not a forecast. Any month can deliver a calm crossing or a bad one. Check the marine forecast for your sailing date. Select a month to see every sea and ferry crossing ranked for it.
Where to be on board
Front to back
- Bow (front)Avoid
- MidshipBest
- Stern (aft)OK
The crossing: 25 minutes to 32 hours
Roughest stretch: Open water in the strait, away from the Punta Arenas and Porvenir shores
Stay near the middle of the boat and low. Bow and stern move most in a rough sea.
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The crossings that cross it
| Route | Typical duration | What to know |
|---|---|---|
| Punta Arenas to Porvenir (TABSA) | About 2 hours | Daily crossings between Tres Puentes and Bahía Chilota. TABSA says the time is subject to weather. |
| Primera Angostura, Punta Delgada to Bahía Azul (TABSA) | 25 minutes | The narrowest passage of the strait. TABSA says schedules may vary due to weather, unforeseen events and force majeure. |
| Punta Arenas to Puerto Williams (TABSA) | About 32 hours | TABSA says the time is subject to weather and that schedules vary with tide, weather and traffic. |
| Punta Arenas to Ushuaia (Australis Fjords of Tierra del Fuego) | 5 days and 4 nights | An expedition cruise that leaves from Punta Arenas, on the strait. |
What helps on this crossing
- Pick May to July if you can. Wind reanalysis puts those months among the calmest and October to December among the windiest.
- On the 2 hour Punta Arenas to Porvenir crossing, sit near the middle of the boat, watch the horizon and keep your phone away.
- Check TABSA's crossing status before you go. The operator reports the status of the Primera Angostura crossing on tabsa.cl and says schedules may vary with weather.
For the full toolkit see the seasickness guide, or what to do once it has already started. For what the trials actually say about the oldest trick on that list, see the verdict on looking at the horizon. If the rocking follows you ashore afterwards, that is land sickness, which is normal, and it passes.
Frequently asked questions
Is the Strait of Magellan rough in July?
July is among the calmer months in the wind reanalysis, with an average daily peak wind near 15 knots. It is still a strait with unpredictable winds and currents, according to Wikipedia, and TABSA says its crossing times are subject to weather.
Is the Strait of Magellan rough in November?
November is one of the windiest months in the reanalysis, with an average daily peak wind near 19 knots and winds of 28 knots or more on about 15 percent of days at the Primera Angostura cell.
How long is the Punta Arenas to Porvenir ferry?
TABSA says the trip takes approximately two hours through the Strait of Magellan, subject to weather conditions. The Primera Angostura crossing takes 25 minutes.
Why is the Primera Angostura tricky?
Spanish Wikipedia says tides there reach 10 m and drive a current of up to 8 knots through the passage. TABSA calls it the narrowest passage of the strait and says schedules may vary due to weather conditions, unforeseen events and force majeure.
Other crossings
Sources & further reading
- https://en.wikipedia.org/wiki/Strait_of_Magellan
- https://es.wikipedia.org/wiki/Primera_Angostura
- https://en.wikipedia.org/wiki/Patagonia
- https://www.tabsa.cl/static/js/main.c60b50d2.js
- https://www.australis.com/fjords-of-tierra-del-fuego/
- https://www.australis.com/plan-your-trip/
- https://open-meteo.com/en/docs/historical-weather-api
Sea conditions described here are typical patterns drawn from published marine and operator information as of July 2026, not a forecast: conditions on any given sailing depend on the weather that day, and any month can deliver a calm crossing or a bad one. Route and operator names are trademarks of their respective owners; Dizzout is not affiliated with or endorsed by them. Seasickness sensitivity varies from person to person; this page is informational and not medical advice.