The most ideal time of the year to visit Rome is between October and April. This is when tourist crowds have dissipated and rates are lower for rooms and other amenities. However, besides the freedom to explore more and pay less, the weather might not be very inviting. But temperatures hardly dip below freezing point, so you could still have fun. High season falls from May through mid-September and in Rome this is usually summer, which means high temperatures and sometimes you will have to stand in long lines. This is not the way you would want to enjoy your visit as you cannot miss what to do in Rome.
Stunning day trip to the Sea Ostia Antica