If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in El Peñol: The hottest months are usually August and September with an average temp of 63°F, while the coldest months are January and July with an average of 63°F. The rainiest months in El Peñol are April, May, October, and November, with each month seeing an average of 17 inches of rainfall.