The best time to visit this beautiful country is in the spring (April to June) or fall (September and October).
During these months, temperatures are the most comfortable and crowds are not too hectic. Furthermore, the prices are lower. The worst time to visit Italy is from July through early September.
August is the worst time to visit Italy as many Italians celebrate Ferragosto. Therefore many places including family-run businesses, hotels, restaurants, and shops are closed in August. Furthermore, the weather is extremely hot in August and the prices are higher.
As far as flight prices go, the most expensive month to fly to Italy is July, and the least expensive months are February and November.