Taking into account the local weather in Tremezzo is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually July and August with an average temp of 66°F, while the coldest months are January and February with an average of 39°F. The rainiest months in Tremezzo are August, November, May, and October, with each month seeing an average of 8 inches of rainfall.