Catania in October

April through June gives you perfect weather without summer's brutal heat — temperatures around 22-25°C and fewer crowds at Mount Etna. September and October are equally sweet, with warm sea temperatures and harvest season bringing fresh produce to markets. July and August hit 35°C regularly, plus every Italian family descends on Sicily for vacation. But summer does mean late-night street life and beach access. Winter stays mild (15°C average) but many Mount Etna tour operators close, and you'll miss the outdoor dining scene. The Feast of Saint Agatha in February brings massive crowds but incredible street processions — book accommodations months ahead.