Weather will likely play an important role when you plan your trip to Puerto Bolívar, 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 77°F, while the coldest months are July and June with an average of 74°F. The rainiest months in Puerto Bolívar are May, April, June, and March, with each month seeing an average of 18 inches of rainfall.