Is it warm enough to swim in Portugal in September?

September is also the best month to swim in the sea, as the average sea temperature is 20°C. Rainfall is at a minimum in the Algarve region and in Lisbon with an average of 20mm, but rainfall increases inland and in the northern parts of the country with an average of 55mm.



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You can swim in the ocean comfortably from March until October. And in the winter months, you can take long refreshing beach walks. Find out what the weather in the Algarve is like from January until December.

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The high season – June to August – is the best time for the beach. During the summer months, you'll find warmer ocean temperatures, especially as you head south to the Algarve. Water temps and crowds alike peak in July and August, so plan on sharing those pretty beaches with plenty of other sunseekers.

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The best time to go to Portugal, specifically in Lisbon is again during the shoulder season. Similar to Porto, the sweet spot for visiting Lisbon is during the shoulder seasons of May-June and September-October.

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You can swim in the ocean comfortably from March until October. And in the winter months, you can take long refreshing beach walks. Find out what the weather in the Algarve is like from January until December.

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Algarve is the hottest region of Portugal, with the exception of Madeira Island (an archipelago of Portugal). In the Alentejo region the average temperatures are around 16ºC (depending on if you are on the coast or in the interior) and in the Algarve region 18ºC.

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