If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Sopetrán: The hottest months are usually August and July with an average temp of 66°F, while the coldest months are January and October with an average of 65°F. The rainiest months in Sopetrán are May, April, October, and November, with each month seeing an average of 16 inches of rainfall.