Taking into account the local weather in San Giovanni Ilarione 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 69°F, while the coldest months are January and December with an average of 39°F. The rainiest months in San Giovanni Ilarione are May, November, June, and July, with each month seeing an average of 7 inches of rainfall.