Weather is probably a major factor 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 March and February with an average temp of 77°F, while the coldest months are August and September with an average of 73°F. The rainiest months in Puerto Bolívar are March, February, April, and January, with each month seeing an average of 10 inches of rainfall.