Piscina das Marés

The Piscina das Marés (literally “tide pool”) is a pair of saltwater swimming pools built into the rocks of Leça da Palmeira’s beach, just north of Porto in the Matosinhos council area. It was designed by the Portuguese architect Álvaro Siza Vieira, who comes from Matosinhos and later won the Pritzker Prize, the top award in architecture. Building started in the 1960s and the pools opened in 1966.

For parents the appeal is simple. You get the Atlantic, the rocks and the smell of the sea, but your child swims in a still pool with a lifeguard watching, not in the surf. There are two pools: a large one and a smaller one that the local Leça news site describes as for children only. Both are filled with seawater.

For anyone interested in buildings, it’s also a famous place. Matosinhos Sport, the council company that runs it, notes that it has been a National Monument since 2011 and is the only Portuguese building in 100 Buildings of the 20th Century, a reference book on world architecture edited by Thom Mayne.

Most families spend the day between the water and the concrete terraces. Small children splash in the children’s pool, and confident swimmers head for the big one. Small floats and armbands are only allowed in the small pool, and even then the lifeguard can say no if it’s crowded. Lilos, inflatable boats and similar toys are banned everywhere.

Diving and jumping into the water are not allowed, and neither are running, pushing or ball and racquet games on the deck. If your child’s idea of a pool day is cannonballs and water fights, this is a calmer place than they’re used to. Children who like to float, paddle and look around will be happier.

Older children and teenagers who like buildings can look at how the pools were fitted into the natural rock. Between 2019 and 2021 the pools had a major restoration because the reinforced concrete, the main pool and the seawater filtration system had worn out, and Siza himself signed the restoration project and followed the work closely.

In July and August, the Leça news site says free fitness classes run on Saturdays and Sundays at 10:30 and 16:00, included in the entry ticket.

The Piscina das Marés only opens in the summer bathing season. Matosinhos Sport says this covers June, July, August and September, with opening and closing dates that change each year. In 2026 it opened on 6 June, and by late September the pools were closed again. Check the Matosinhos Sport page in spring for next year’s dates.

Opening hours, from the 2026 price list:

• July and August: every day, 9:00 to 19:00
• June and September: every day, 9:30 to 18:30

Bad weather can close the pools completely or partly, and Matosinhos Sport doesn’t refund tickets when that happens. On a grey, windy day, think twice.

Outside the season you can’t swim, but architecture visits run all year. They are booked through the Casa da Arquitectura in Matosinhos (tours@casadaarquitectura.pt).

Prices depend on the day and on whether you stay all day or half a day. A half day means 9:00 to 14:00 or 14:00 to 19:00 (9:30 to 14:00 or 14:00 to 18:30 in June and September). When checked in September 2026, the official 2026 price list gave these standard prices:

Ticket	Weekdays	Weekends and holidays
Child (2 to 12), full day	€7.50	€8
Child (2 to 12), half day	€5.50	€6
Adult or teen (13+), full day	€11	€13
Adult or teen (13+), half day	€8	€9

Babies under 2 go in free. Holders of the Cartão Matosinhos (the council’s resident card) pay less: €5.50 for a child’s weekday or €3.50 for a child’s half day.

For families who plan to come often, there are “10 Marés” cards with ten entries. On the children’s ten-entry card, Matosinhos Sport gives one free adult entry for every ten children’s entries, which helps if you’re the parent who has to go in anyway.

Tickets are sold at the entrance and online through Matosinhos Sport’s booking site (matosinhosport.sincelo.pt). If the pools reach capacity, staff stop letting people in until others leave, so arriving early on a hot August weekend is sensible.

If you only want to see the building, an unguided tourist visit without swimming cost €5 (€3 with the Matosinhos card).

These come from the pool’s own regulations, updated in April 2026.

• Children under 13 must be with a responsible adult. Staff can ask for a citizen card or ID to check a child’s age, so bring your children’s documents if you’re claiming the child price.
• Everyone gets a wristband at the entrance and must wear it on one wrist, visibly, all day. It’s personal, and giving it to someone else means paying again.
• Babies must wear swim nappies.
• Everyone showers and walks through the footbath before getting in.
• Only flip-flops or sandals are allowed on the deck around the pools. No shoes or street clothes in the water.
• No parasols, windbreaks, awnings or beach chairs may be brought in. The one exception is a small baby tent. The Leça news site says parasols and loungers can be hired at the bar, first come, first served.
• No eating in the swimming areas, no glass or knives outside the bar, no speakers, no scooters or bikes, and no dogs except guide dogs.
• Don’t photograph or film other swimmers.

The regulations don’t mention swim caps, so unlike Portugal’s indoor municipal pools you shouldn’t need one here. Pack one anyway if your child is used to it; it does no harm.

There’s very little natural shade on the concrete and rocks, and you can’t bring your own parasol, so sun hats, long-sleeved swim tops and a hired parasol matter more here than at most pools. The water is seawater from the Atlantic, so expect it to feel cooler than a heated municipal pool.

The bar has a terrace. Food isn’t allowed around the pools themselves, so plan snacks for the bar area.

Buggy and wheelchair access aren’t described on the official pages, so phone Matosinhos Sport before you go if you need a step-free route to the water.

The pools sit on Leça beach, so you can mix a swim with rock-pooling and sandcastles outside. Up the coast, the Farol de Leça lighthouse opens for free climbs on Wednesday afternoons, and the fire brigade museum is also in Leça. Across the harbour in Matosinhos, children who liked watching the ships can visit the Leixões cruise terminal, and older children can try a lesson with Surfing Life Club on Matosinhos beach.

Is the Piscina das Marés good for toddlers?

Yes, as long as you stay with them. There’s a separate small pool for children, babies must wear swim nappies, and under-2s go free. There’s little shade and you can’t bring a parasol, so pack for strong sun.

Do children need a swim cap at the Piscina das Marés?

The 2026 regulations don’t list a swim cap. They do require swimwear, a shower and footbath before swimming, and flip-flops or sandals on the deck.

How much does the Piscina das Marés cost for a family?

In 2026, a weekday full day was €7.50 per child aged 2 to 12 and €11 per adult; at weekends it was €8 and €13. Half-day tickets were cheaper, from €5.50 per child.

Is the Piscina das Marés open all year?

No. It opens only in the summer bathing season, from around June to September, with dates set each year. Outside that season you can book an architecture tour but not swim.

Can children swim there on their own?

Only from age 13. Younger children must come with a responsible adult.

Can you jump or dive in?

No. Jumping and diving are banned for safety, along with ball games and running on the deck.