The best period to go to Naples and the Amalfi Coast, as well as the weather to expect when one visits Naples along with a five-day forecast for the bay of Naples and the Amalfi Coast.
The best weather in Naples and on the Amalfi Coast is in Spring and Fall, although in Winter it could be an ideal destination for a weekend as the lively Christmas markets and clear visibility make it more desirable than many other Italian cities. Especially, considering its milder winter climate and the forecast of Naples that will never disappoint you.
But, remember that in the winter months, with shorter days, you'll have to limit the range of your sightseeing to make the most of your days. In Winter, you could do a half-day tour of Pompeii or of the Amalfi Coast, but you wouldn't have time to visit both in daylight hours even if the weather in Naples is still always good.
The weather in Naples and along the Amalfi Coast in Summer can be very hot and humid as well, which also limits visibility for those wanting to trek up to the top of Mt. Vesuvio. It's also the time when hordes of domestic tourists descend on to the Amalfi Coast and the islands of the bay of Naples for their annual vacation. With many businesses also being closed during this period we would recommend you another time of the year to visit Naples and the Amalfi Coast, when both the weather and temperament of the locals are less oppressive.
The spring weather, along with the flowers blossoming, is probably the ideal time of the year to visit Naples and the Amalfi Coast. The heat is not oppressive and the number of tourists visiting the area doesn't detract too much the attention from Naples and the beauty of the Amalfi Coast. In Fall, from the second week of September, you'll also discover a more calmer city with a still good climate in Naples, and along the Amalfi Coast the lemon and olive trees provide the color and the ambience that typify this time of the year in Naples and along the neighboring Amalfi Coast.