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.
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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).
Lovely sunny weather makes May an ideal time to visit, especially if you're hitting a long-distance trail like the Via Algarviana or the Rota Vicentina. The crowds are beginning to arrive in Lisbon, Porto and the Algarve, though it's still a fairly relaxed scene compared to the summertime high season.
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 warmest part of the Algarve is the eastern Algarve. The more west you travel, the colder and windier it usually gets, especially ones you go around the corner at Sagres. I would recommend staying anywhere in between the Spanish boarder and Salema.
Albufeira is a coastal town in the Algarve region of southern Portugal. It is located about 40 km north of the city of Faro. Albufeira is one of the warmest places in Portugal in winter because of its perfect climate.
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).
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!
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.
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.
Lisbon has a Mediterranean hot climate (Csa) whereas Istanbul has a humid subtropical climate (Cfa). Both are in or near the warm temperate dry forest biome. The average temperature is 2.7 °C (4.8°F) warmer.
Ultimately it depends on the situation and personal preference, as in there are areas of Portugal which get hot at certain times of the year, however Cyprus definitely beats Portugal in general terms of extreme weather conditions.
Not much difference in average temps in either location, though the algarve is more influenced by its proximity to atlantic weather systems than the costa del sols more sheltered med location.
Sunny days and warm temperatures characterize the Algarve at this time of year. Although they can get as high as 95°F/35°C and as low as 55°F/13°C, the climate of the southern coast is temperate.
Seasonality plays a part: May through August are typically the strongest months, UV-exposure-wise. But, as the Sun Safety Alliance states, “UV rays reach Earth every day—including wintertime. Snow can reflect 85% to 90% of the sun's UV rays.” So, lather up the SPF year round.