What's the weather like in Italy in October?

Warm days and cool evenings — roughly 65–75°F in Rome and Tuscany, cooler in the north, still swimmable in Sicily early in the month. It's one of the two best months to be there. Bring layers rather than a heavy coat: mornings and evenings want a jacket, midday often doesn't. Rain comes in short bursts rather than all-day drizzle, but October is genuinely wetter than September, so a small umbrella earns its space. By the last week the north starts to feel like autumn properly, and hill towns get atmospheric fog in the mornings.