Weather is probably a major factor when you plan your trip to Boa Esperanca, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and October with an average temp of 72°F, while the coldest months are July and June with an average of 64°F. The rainiest months in Boa Esperanca are December, January, November, and February, with each month seeing an average of 10 inches of rainfall.