The island stands in the way. Madeira's usual wind is the north-east trade wind and its biggest swells come from storms in the North Atlantic, so the north coast takes the blow while the south coast lies in the lee, behind a mountain ridge that reaches 1,862 metres.
What shelters the south coast?
The island itself. Madeira is about 57 km long, from Ponta de São Lourenço in the east to Ponta do Pargo in the west, and about 22 km at its widest. A mountain ridge runs along its middle and peaks at Pico Ruivo, 1,862 metres high. All the land above 1,400 metres is protected as the central mountain range.
The north-east trade wind blows into that ridge for much of the year. On the north side, the moist air is forced up the steep slopes, cools and turns into cloud and rain. By the time the wind reaches the south side, over and around the mountains, it is weaker and drier. That is why Funchal is usually sunnier than Santana on the north coast, and why the sea in front of it is so often flatter.
Three reasons the sea is gentler in the south
- The wind shadow. Behind the mountains, the wind over the water is lighter. Light wind means small wind waves, so the sea off the south coast is often smooth even when the north coast is white with spray.
- The swell comes from the other side. The big winter storms of the North Atlantic send their swell towards Madeira from the north and north-west. The north coast faces it head on. The south coast only gets what bends around the ends of the island, which is much smaller.
- Little room for waves to grow. Wind waves need a long stretch of open water to build. When the wind blows off the land, the water close under the cliffs has almost no distance to work with, so it stays flat near the shore.
On an ordinary trade-wind day the difference is large. One warning in September 2024 forecast waves of up to 3 metres on the north coast and no more than 1 metre in the south. In a big northern storm the gap is huge: on 12 and 13 December 2025, IPMA put the north coast under a red warning, with maximum wave heights of up to 14 metres.
Is the whole south coast equally sheltered?
No. The two ends of the island are the exception. When the trade wind meets Madeira, part of it is squeezed around the eastern and western tips and speeds up. Researchers who went through 35 years of wind and ocean records (the paper came out in 2021) found a jet of faster wind at each tip that is there almost all the time, and strongest in summer, when the trade wind holds its direction best.
The weather warnings show the same pattern: IPMA often names the eastern end when gusts are strong. One case from April 2026 was a yellow wind warning on the south coast for gusts from the north of up to 85 km/h, aimed at the eastern tip. Meanwhile the middle of the coast, from Funchal west past Câmara de Lobos and Cabo Girão to Ribeira Brava and Ponta do Sol, sits in the calmer wake between the two jets. That is the stretch a private boat tour in Madeira with Chifbay follows, and it is not by chance.
Is the shelter different in summer and winter?
Yes, in a useful way. The same 2021 study found that the wind reaching the island is stronger in winter but changes direction more, while in summer it blows from the north-east far more steadily. A steady north-easterly is exactly the wind the mountains block best, so summer is when the south coast's shelter works most reliably, even though the jets at the tips are at their strongest then.
The study noticed something else in summer: the sea surface is cooler under both jets, more so near the western tip, where the wind helps draw colder water up from below. You will not feel that on a trip from Funchal, but it shows how much the wind around the ends of the island shapes the sea there. Winter brings the opposite problem. The trade wind is less regular, and the Atlantic storms that do reach Madeira can come from the west.
When is the south coast not the calm side?
When the weather comes from the west, south-west or south. The shelter only works against wind and swell from the north. Old accounts of Funchal's anchorage say it was protected from every wind except those from the south, which could drive ships onto the shore. That is still the weak spot.
Winter is when it happens most. In March 2025, IPMA put the south coast under a yellow warning for westerly waves of 4 to 5 metres. And in that December 2025 storm, while the north coast was under red, the south coast was under orange too, with westerly waves forecast up to 10 metres at their highest. On days like these, both sides are rough and boats on the south coast stay in port. A large north-west swell can also bend around Ponta do Pargo and reach the western part of the south coast.
Then there is the east wind, called leste locally, which brings warm, dry air from Africa and sometimes dust. Because it runs parallel to the south coast instead of coming down off the mountains, it can stir up water that is normally sheltered. Our guide to calima and Saharan dust covers it.
What does this mean for planning a trip?
Two things. First, most boat trips in Madeira leave from harbours on the south coast, such as Funchal and Calheta, for exactly these reasons. Second, a stormy headline for "Madeira" is not always a stormy forecast for your trip. Check the south coast zone in IPMA's warnings, not the north. Our guide on how to read the sea forecast shows how.
It also means the north coast, with its waterfalls into the sea and the lava pools of Porto Moniz, is best seen from the road and the viewpoints, as in our guide to the north coast. For the high cliffs from the water, the south has its own giant: Cabo Girão by boat, 580 metres of rock falling straight into the sea. Chifbay trips see it from the sheltered side of the island, and that shelter is a big part of why they go there.
Frequently asked questions
Is the sea always calm in Funchal?
No. It is calm far more often than the north coast, but wind and swell from the west, south-west or south reach it directly, mostly in winter.
Which part of the south coast is calmest?
Usually the middle, from Funchal west to around Ponta do Sol. The eastern and western tips get stronger wind as the trade wind is squeezed around the island.
Why is the north of Madeira wetter and greener?
The same trade wind is pushed up the northern slopes, where it cools and drops rain. The south coast lies in that rain shadow.
Can you take a boat trip on the north coast?
The north coast faces the open North Atlantic and takes the big swells first, so the sea there is far less often right for a relaxed trip. That is why most trips stay on the south side.
On this island, the mountains do half of the skipper's work.