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Rome has one of the greatest visitor populations worldwide, so being selective about your travel times is beneficial. Travelling at unsafe times of the year includes going when most tourist sites are closed or only open for a short time. Here is a breakdown of each month depending on weather, spending, and, of course, any events or festivals you might want to go to.
WHEN TO VISIT
Jun-Sep (Except August)
Rome is by far busiest during June through September, when visitors from all over the world flock to the Eternal City. The summer months are often bright, and pleasant, and have clear skies, which makes walking about the city a great delight. Rome is so kind to visitors that you won't notice the throng. With an average high temperature of 30°C in July and August, it is advised to take sunglasses and a sun hat to protect yourself from the heat. The costs are at their highest because it is peak season.
Oct-Mar (Except December)
The nicest thing about travelling to Rome between October and March is the significant price reduction even for tourist attractions like Duomo Milan Tour. With an average temperature of 10°C, Rome's winter is not very harsh, so you can still handle touring without too much difficulty. The rainiest months are November and December, so bring your umbrella! Rome is a wonderful place to visit around Christmas since the marketplaces and town squares are so wonderfully decorated. A breathtaking sight is the enormous Christmas tree in St. Peter's Square.
April-May
If you want to travel to Rome while the weather is nice and the costs are reasonable, April to May is the best time to do it. You may avoid the lines at popular sights, find lesser crowds there, and take advantage of everything spring has to offer. Schedule your vacation to coincide with Easter to enjoy the brightly coloured eggs on display everywhere, the joyous atmosphere, and the open-air service in Vatican City.
WHEN NOT TO VISIT
August
Rome's warmest month is August; most Italians take vacations. One of the most anticipated holidays of the year, the infamous Ferragosto, falls during this month. It is the month when the nation is most crowded and when EVERYTHING increases in price. It may surprise you to learn that summer in Italy may be much hotter than summer in Brazil. For people suffering from conditions like rhinitis and other allergies, dry air is horrible. The lineups at the monuments such as the Duomo Milan Tourappear to have tripled, and the price of a bottle of water has increased from the usual one or two euros to as much as five euros.
December
The period from the end of September to the start of December is the worst time to visit Italy. It's the rainy season, and when we say rainy, we mean that there is A LOT of water falling each day! We do not advise! Yet, this time has its benefits because costs are lower and the food is fresher.
Ref: https://www.social-vape.com/read-blog/24849