Weather is probably a major factor when you plan your trip to Prainha, 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 76°F, while the coldest months are July and August with an average of 67°F. The rainiest months in Prainha are January, February, March, and December, with each month seeing an average of 11 inches of rainfall.