If you're looking forward to lots of outings with your partner, check out these details about year-round temperatures in Aguas de Santa Barbara: The hottest months are usually December and September with an average temp of 74°F, while the coldest months are July and June with an average of 65°F. The rainiest months in Aguas de Santa Barbara are January, December, February, and November, with each month seeing an average of 8 inches of rainfall.