The best time to visit Agia Thekli is during the shoulder seasons of May, June, September, and early October.
During these months, you'll experience pleasant temperatures ranging from the low 70s to high 80s Fahrenheit, ideal for enjoying the beaches and outdoor activities without the intense heat or larger crowds of mid-summer. The sea is also warm enough for swimming, and you'll find all local establishments open and operating.
For couples seeking a peaceful getaway, early June or September offers a particularly tranquil experience. The island is less crowded, allowing for more intimate moments at secluded beaches and waterfront dining.