The coast of Castiglione della Pescaia is washed by the waters of the Tyrrhenian Sea, which is part of the Mediterranean Sea. The average temperature of the Tyrrhenian Sea is +19°C in May and +23°C in June. In turn, the temperature of the Tyrrhenian Sea off the coast of Castiglione della Pescaia in July and August ranges from +23-25°C. Due to the rather high temperatures and bright sunshine, the swimming season in Castiglione della Pescaia lasts from May to September.
In addition, in spring and autumn, for those who are chilly to swim in the open sea, there are indoor heated swimming pools on the territory of the resort. But the first half of October is also considered quite acceptable for swimming. The average temperature of the Tyrrhenian Sea in September reaches +24.9°C, and from October gradually decreases to +21.5°C. The Tyrrhenian Sea is also not characterized by high tides, and the waves are relatively calm.
