For most travelers looking for sunny, warm days with a minimum of people, the best time to visit Italy is late May or early October. These months are cooler and less crowded than the hot summer months in between. Right now you can explore the north and south, the cities, the coast and the mountains in comfort. Spring (April to June) and autumn (September and October) are undoubtedly the best times to visit Italy, both in terms of climate and cost.
In addition to getting the occasional bargain, you'll also have fewer people to deal with and the chance to visit one of Italy's many festivals. Autumn (September to November) is also part of the intermediate season and is arguably the best time of the year to travel to Italy. The coldest temperatures arrive in October, much earlier in the north, and in November rainfall has increased. Rome is at its best in late spring and early fall, but it's still a wonderful destination all year round.
From vibrant and colorful harvest festivities in fall, coastal and mountain adventures in summer to incredible skiing activities in winter and great tourist weather in spring. If you're looking for an ideal time to visit Italy, then spring (April-May) and fall (October) are your best bet. The temperatures are pleasant, there are fewer people around, prices are lower and you can explore everything the country has to offer without feeling overwhelmed. Mountain resorts can be quite crowded in August, when many Italians spend their holidays in the mountains.
So if you want to avoid crowds, plan your trip for either spring or fall.