The best time to go to Petrothalassa is during the shoulder seasons of May, early June, September, and early October.These months offer pleasant weather with warm temperatures, ideal for enjoying the beaches and outdoor activities without the intense heat and larger crowds of the peak summer months. You'll find the sea warm enough for swimming, and the local tavernas and shops will be fully open but less busy, offering a more relaxed experience.For those looking for a very quiet holiday focused on relaxation, late April or late October can also be appealing. The weather might be a bit cooler, but you'll have the area almost to yourself, and prices for accommodation are generally lower.