Weather will likely play an important role when you plan your trip to Varenna, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August, with an average temperature of 19°C, while the coldest months are January and February, with an average of 4°C. The rainiest months in Varenna are August, November, May and October, with each month seeing an average of 210 mm of rainfall.