Weather will likely play an important role when you plan your trip to Penha, 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 75°F, while the coldest months are July and August with an average of 63°F. The rainiest months in Penha are January, February, March, and December, with each month seeing an average of 8 inches of rainfall.