Bathing suit on the Portugués??

If you like swimming in frigid water, yes;-)
For the record, I asked the same question in 2015 and was convinced not to take one. I was never tempted to get wet!
On the Via de la Plata, it's a different story. There are baths at Banos de Montemeyer (disappointingly tepid rather than warm) and beautiful natural rock pools at Oviedo - so on that route it's well worth taking togs. Some people just wear their underwear.

elleley said:

In less than 2 weeks I will be walking the Coastal route with my sister

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Hi, it's the Atlantic Ocean and cold. By mid-September the water will be very cold .
But perfect walking weather! (If it's not raining, and blowing a gale .)
Jill

I went for a paddle at a beach near Vigo in October last year late afternoon while my better half had a snooze at a hotel.

The water was very cold but after a period of foot to knee imersion, it became curiously comfortable. I recon if you plunged in, you'd have your breath taken away at first.

The cold reminds me of swimming club training at a child / teenager in a cold water pool during winter in Victoria, Australia during which one's feet and hands turn blue after a while.

The club house had a bank of electric heaters on a wall inside where one could feel the delicious heat after a shivery session.

There were people swimming though and lots of kids in the water on the beach oblivious to the cold (for a while anyhow - no heaters on the wall afterwards though).

We did see some nudists on another beach from a distance so goodness knows what effect the cold water might have! Not going there

To swim or not to swim, that is the question

Cheers

Graham