Benchmarked strictly across TripTiming's 5 empirical pillars: Crowds, Weather, Vibes, Prices, and Safety.
Cancun emerges as the optimal May destination with an overall TripTiming Index of 67/100 vs 64/100 for San Juan (+3 point advantage). Cancun captures optimal environmental comfort with 36°C daytime feels-like temperatures and 18% rain probability, compared to 33°C in San Juan. In addition, Cancun offers more breathing room at premier cultural landmarks (60/100 vs 54/100). While San Juan retains an edge in City Vitality (61/100 vs 49/100), Cancun's commanding performance in Weather Comfort secures the overall May recommendation.