Spring (April-June) and autumn (September-October) are ideal, with mild temperatures for exploring archaeological sites on foot and wildflowers or golden light adding to the scenery. Summer (July-August) brings intense heat, especially at exposed sites like Olympia and Mycenae with little shade, though it is peak season for the Epidaurus Festival and beach towns. Winter is quiet and mild along the coast but some mountain roads and rural sites may have reduced hours.