In general the climate in Rome, and especially Florence and the Tuscan region is very mild. There are little differences between the regions, though. Rule of thumb: at the coast and in the valleys the summers are hotter than in the hilly areas, where the climate is very continental – rain falls are more often. Usually the summers in Tuscany are without rain and very hot, especially in the valleys. Spring (april and may) and autumn (october and november) might be rainy but there are still dry, sunny days. In the winter there are sunny, mild days but at night it sometimes gets very cold. July is the hottest month with temperatures from 73° up to 86°. Especially in the valleys the temperatures sometimes rise up high. In the coldest month – january- they are about 44° at the coast and about 38° to 42° inside the country. Of course the temperature in the mountainious areas is below.

Tourist season:
The main season is spring, summer and autumn, especially because the landscape at that time of the year is very beautiful. For going sightseeing the summer months are sometimes too hot and the museums and cities are overcrowded. For sightseeing tours the winter month could be contemplated. During the last years family vacations in Tuscany during the summer got more and more attractive

October is less crowded but be prepared for rain--about 3 inches for the month in Rome and Florence and Naples.  There are still sunny days, but possibilities of several days of rain.

Weather in Italy  - Gives the current weather for hundreds of Italian cities and a link to USAToday's forcasts for all of Europe.

Italy weather 365 - on this website, specify where and when you're visiting Italy and they'll show you, day by day, temperatures, rainfall and average highs and lows for the times of your vacation, all based on years of collected weather data.