The best time to go to Es Castell is during the shoulder seasons of May, June, September, and early October. These months offer pleasant weather, ideal for exploring, without the peak summer crowds.During May and June, the island awakens with blooming wildflowers, and the sea is warm enough for swimming. Days are long and sunny, superb for enjoying outdoor cafes and coastal walks. It's an excellent time for couples looking for a relaxed trip with comfortable temperatures for sightseeing.September and early October provide a continuation of warm weather, with the sea at its warmest. The summer crowds have thinned, making it easier to enjoy popular spots like the Cales Fonts harbor.