If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in San Pedro La Laguna: The hottest months are usually March and February with an average temp of 75°F, while the coldest months are December and January with an average of 74°F. The rainiest months in San Pedro La Laguna are September, May, June, and October, with each month seeing an average of 22 inches of rainfall.