Palermo has a mild Mediterranean climate. July and August are hot with temperatures in the 30s (Celsius) and humid. Winters are mild and it rarely drops below freezing. January and December are the coldest months with temperatures in the teens. November through January have the most rainfall.
The best way to see Palermo’s medieval centre is on foot. All the sights are close enough that you won’t need more than your own two feet. The rest of the city is another story, and you’ll need to travel via bus or taxi. Buy bus tickets at tobacco shops before you board, and the bus will take you anywhere you need to go, including as far out as Monreale or Mondello. Trips made within a set time period cost a flat fare, or you can buy an all-day pass. For major sights and attractions, you may want to take the Giro Citta tourist bus. The bus travels in a loop, so you’ll get on and get off at Teatro Politeama. Buy your tickets on board. Buses are very convenient, but they can be slow. For a faster trip, call for a taxi or pick one up at a stand. You can also rent a taxi for an entire day.