Weather is only one factor, but it can really affect your travel plans, especially if you are planning a longer stay in Joao Neiva. The hottest months are usually February and March with an average temp of 77°F, while the coldest months are July and August with an average of 70°F. The rainiest months in Joao Neiva are December, November, January, and October, with each month seeing an average of 7 inches of rainfall.