Weather is probably a major factor when you plan your trip to Dupax del Sur, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually May and June with an average temp of 75°F, while the coldest months are January and February with an average of 68°F. The rainiest months in Dupax del Sur are September, August, July, and May, with each month seeing an average of 20 inches of rainfall.