Weather will likely play an important role when you plan your trip to Boa Vista, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and October with an average temp of 83°F, while the coldest months are July and June with an average of 79°F. The rainiest months in Boa Vista are May, June, July, and April, with each month seeing an average of 13 inches of rainfall.