In the north of the country, you can expect highs of 54°F (12°C), though some showers should still be expected. It's balmier and drier as you move further south to Lisbon, where highs around this time can reach 72°F (22°C).
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The hottest place is Portugal in May is Évora (24ºC) in the beautiful Alentejo region between Lisbon and the Algarve. Both Lisbon (22ºC) and Faro (22ºC) on the Algarve coast will feel warm in May, with temperatures likely to reach the high 20s.
This one is a close call with both destinations seeing temperatures sitting in the balmy mid- to late-twenties during the summer months. Out of the peak season, the Greek island of Crete warms up as early as May hitting around 25C, while the Algarve isn't far behind at around 22C.
The best month to visit Portugal, specifically the Algarve, is during the shoulder season. I personally love visiting in May-June or late Sept-October. If you're looking to make the most of the Algarve, the sweet spot lies in the shoulder season — May-June and September-October.
May is the perfect month to travel to The Algarve if you love the warm Algarve sun but want to avoid the hot 30+ temperatures in summer. It's warm enough for activities like exploring beaches, eating out, and swimming, but still mild enough to enjoy activities like hiking, horse riding, bird watching, and climbing!
How Often Does It Rain in May? During May, Lisbon will feature about 17 mostly sunny, 4 partly sunny, and about 10 mostly cloudy days. You can also expect that 9-10 days will record some rainfall. However, only about 5 days record at least 1 mm (0.04 inches) or more, and only 2 days will see 10 mm (0.4 inches) or more.
It's balmier and drier as you move further south to Lisbon, where highs around this time can reach 72°F (22°C). Beach days get likelier in May as temperatures in the Algarve, in Portugal's south, hit up to 72°F (25°C).
What are the hottest places in Europe in May? The hottest city in Europe in May is Seville (27°C) in southern Spain, followed by Antalya (26°C) in southern Turkey. The islands of Crete, Malta and Cyprus will also feel hot at 24°C, along with Valencia and the Costa de la Luz (24°C) in Spain.
It's balmier and drier as you move further south to Lisbon, where highs around this time can reach 72°F (22°C). Beach days get likelier in May as temperatures in the Algarve, in Portugal's south, hit up to 72°F (25°C).
The cost of living in Portugal is generally considered about 46 percent cheaper than in the United States. This, coupled with the country's excellent quality of life, beautiful beaches, stunning mountain ranges, reliable public transport, and rich history and culture, make it very easy to fall in love with Portugal.
Portugal has a mediterranean climate with hot dry summers and mild winters. If you enjoy hot perfect sunny days the best time to visit Portugal is between June and August. The hottest month of the year is July with an average daily maximum of 30 C and an average low of 22 C.
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.
Summarizing: The weather in May is reliable and warm with average temperatures around 22-24 degrees. Make sure to bring good sunscreen and clothes for warm day temperatures and slightly colder evenings.