Benchmarked strictly across TripTiming's 5 empirical pillars: Crowds, Weather, Vibes, Prices, and Safety.
Faro (Algarve) emerges as the optimal May choice with an index of 75/100 vs 68/100 for Lisbon. While both cities offer viable travel windows, Faro (Algarve) benefits from more favorable lodging value (standard room rates) and manageable carrying capacity ratios.