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Can you swim in Cascais in early October?

We are staying in Lisbon the first week of October and considering a day trip to Cascais. What is the weather like in Cascais? Is it possible to swim/sunbathe in early October? Thanks.

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It’s usually still quite warm in early October. And, the temperature of the water will be at its warmest of the year. Since it’s the Atlantic, that’s not very warm! But, I see people swimming in October. It will definitely still be warm enough to sunbathe.