The best time to go to Ierissos is during the shoulder seasons of May, early June, or September, or for a warmer trip, July and August.
For those looking to enjoy the beaches and outdoor activities without the peak summer crowds, May, early June, and September offer pleasant weather with warm temperatures and plenty of sunshine. The sea is warm enough for swimming, and you'll find the town and attractions less busy, making for a more relaxed experience. This is ideal for couples seeking a tranquil getaway.
If you're after the warmest weather for swimming and sunbathing, July and August are perfect. These months are the hottest and driest, with long days and lively evenings. While it's the busiest time, Ierissos retains a relaxed feel compared to some other Greek destinations.