Weather is probably a major factor when you plan your trip to Rivera, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually January and February with an average temp of 74°F, while the coldest months are July and June with an average of 56°F. The rainiest months in Rivera are September, October, November, and January, with each month seeing an average of 7 inches of rainfall.