If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in San Terenzo: The hottest months are usually August and July with an average temp of 72°F, while the coldest months are January and February with an average of 49°F. The rainiest months in San Terenzo are November, October, December, and January, with each month seeing an average of 8 inches of rainfall.