Weather is probably a major factor when you plan your trip to Rio Bonito, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually February and January with an average temp of 77°F, while the coldest months are July and June with an average of 68°F. The rainiest months in Rio Bonito are November, December, January, and March, with each month seeing an average of 10 inches of rainfall.