Weather is probably a major factor when you plan your trip to Sao Joao Da Barra, 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 78°F, while the coldest months are July and June with an average of 72°F. The rainiest months in Sao Joao Da Barra are December, November, March, and January, with each month seeing an average of 7 inches of rainfall.