Benchmarked strictly across TripTiming's 5 empirical pillars: Crowds, Weather, Vibes, Prices, and Safety.
Mykonos emerges as the optimal September destination with an overall TripTiming Index of 72/100 vs 69/100 for Santorini (+3 point advantage). Mykonos experiences substantially lower visitor footfall and shorter landmark queues (moderate footfall vs heavy visitor congestion in Santorini).