Weather will likely play an important role when you plan your trip to Puerto Carreno, 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 85°F, while the coldest months are July and August with an average of 79°F. The rainiest months in Puerto Carreno are June, July, May, and August, with each month seeing an average of 13 inches of rainfall.