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.
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In the north of the country, Porto is seeing highs of 54°F (68°C), though some showers are still to be expected, so go prepared. It's balmier and drier still as you move further south to Lisbon, where highs are notching 72°F (22°C) and there are just five days of rain to contend with.
Though daily average temperatures are in the low to mid-60s°F (16°C-18°C) across the country, nightly temperatures drop 10 degrees, so be sure to pack accordingly, warm clothes for the evening and plenty of sunscreen.
The late fall and winter months—from mid to late October through mid-to-late March—are often the cheapest time to fly to Europe (though fares can spike in December). It's often cheaper to fly to Europe mid-week, on Tuesdays and Wednesdays, in particular.
April to May and September to October are the best times for perfect weather. In central Spain and on the Mediterranean coast, the spring and autumn seasons are marked by sunlit days and pleasant weather perfect for strolling and outdoor dining in terrazas, with temperatures cooling down by nightfall.