Planning for the weather is a good way to make your trip to Portofino relaxing and enjoyable, especially when you’re splurging. The hottest months are usually August and July, with an average temperature of 22°C, while the coldest months are February and January, with an average of 9°C. The rainiest months in Portofino are November, October, December and January, with each month seeing an average of 190 mm of rainfall.