August in Portofino is the warmest month of the year. In August, the weather in Portofino is typically warm. Average daily high temperature in August is about 24 degrees above zero. On average, Portofino has 29 sunny, 1 rainy, and 1 partly cloudy day in August. The rains are usually moderate. August as well as June and July is considered the most comfortable time to visit Portofino.