Batnavó dolphin watching from Sesimbra

Batnavó is a small boat-trip company based at Sesimbra’s harbour, on the coast south of Lisbon. It has run nautical tours in Sesimbra and Setúbal since 2015, holds a tourism licence (RNAAT 335/2015) and is recognised by ICNF, Portugal’s nature conservation agency, for nature tourism. The team says it has more than 20 years’ experience of fishing and sailing these waters.

The dolphin-watching trip (“observação de golfinhos”) lasts three hours and normally leaves at 10:00 from the Espadarte pontoon in Sesimbra’s marina. A marine biologist comes along to spot and identify the animals and to explain what they’re doing. The boat heads out to look for dolphins in their natural habitat, and the operator notes that the best season for dolphins around the Sado estuary is April to October.

The most common sighting is a group of bottlenose dolphins, called “golfinho-roaz” in Portuguese. These are the big, grey, round-headed dolphins most children know from books. Common dolphins (“golfinho-comum”) turn up fairly regularly too; they’re smaller and faster, with a yellowish patch on each side. Every now and then the crew also sees fin whales, which are huge, although that’s rare and never promised.

Batnavó says its sighting rate so far is 98%. That is a strong record, but the sea is the sea, and a trip without dolphins is possible.

Seeing a dolphin surface next to a boat is exciting in a way an aquarium can’t match, and the wait and the searching are part of the fun. Children get to be spotters, scanning the water for fins and splashes. Having a marine biologist on board means their questions get real answers: why dolphins travel in groups, how they breathe, what they eat and how scientists tell one dolphin from another.

Depending on where the dolphins are that day, you may also get views of the cliffs along the Sesimbra and Arrábida coast between sightings.

Three hours on a boat is a long time for some children. It suits children from about five or six who can sit reasonably still, cope with a bit of wind and swell, and wait patiently. Children who get seasick may have a rough time, so eat a light breakfast and ask your doctor or pharmacist about seasickness remedies for children in advance.

Batnavó doesn’t publish a minimum age, so if you want to take a toddler or a baby, ask before booking about suitable life jackets and whether they recommend it. Only one of the company’s boats has a toilet, and which boat you’re on depends on how many people are booked, which matters with young children.

This isn’t a drop-off activity; children travel with their parents.

When checked in September 2026, the trip cost €50 for adults and €30 for children up to 11. The price includes the return trip, life jackets, personal accident insurance and the skipper-guide.

There’s a catch for small families: the trip needs a minimum of 8 adults. You may be joining a shared trip with other people, or you could organise a group with friends. Groups larger than 10 to 12 may be split across more than one boat. Book through the website or by phone.

If the sea is too rough, Batnavó cancels and gives a full refund. Your own cancellations follow a sliding scale. On shared trips, cancelling more than 7 days ahead gets a full refund; between 7 days and 48 hours, half is kept; inside 48 hours, nothing is refunded. Private trips have longer notice periods. Personal or health reasons, or a weather forecast that doesn’t actually lead to a cancellation, don’t count as free cancellation.

On shared trips the boat waits 10 minutes for latecomers and then leaves, so allow time to park and find the pontoon.

The operator recommends sun cream, a hat, suitable clothes and shoes, flip-flops, towels and snacks. Even on a hot day it can feel cool and windy out at sea, so bring an extra layer for children, plus water and binoculars if you have them.

Batnavó also runs shorter trips along the coast, which may suit younger children better. When checked, these included a two-hour trip to the sea caves near Sesimbra (from €40), a one-and-a-half-hour trip to Sesimbra’s secret beaches (from €30) and a three-hour Arrábida beaches cruise (from €45). None of them are dedicated dolphin trips.

If you’d rather leave from Setúbal, the Sado dolphin-watching trips from Setúbal are run by a different operator from a different harbour. Near Sesimbra, the dinosaur footprints at Pedra da Mua on Cabo Espichel make a good afternoon for dinosaur fans. Portinho da Arrábida has a sheltered beach for a swim afterwards, and older children could try caving in the Gruta do Médico.

Are dolphins guaranteed?

No. Batnavó reports a 98% sighting rate so far but says sightings can’t be guaranteed in the open sea.

How long is the dolphin trip from Sesimbra?

About three hours, usually leaving at 10:00. Arrive 10 minutes early for the briefing.

How much does it cost for children?

€30 for children up to 11 and €50 for adults when checked in September 2026.

Is there a toilet on the boat?

Only one of the boats has a toilet, and which one you get depends on the group size and date. Ask when booking if it matters.

What is the best time of year to see dolphins?

The operator says April to October is the best season.

Can we go as just one family?

Shared trips need a minimum of 8 adults. Private trips are possible, so ask for a quote.