If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Tarapoto: The hottest months are usually September and August with an average temp of 77°F, while the coldest months are July and June with an average of 75°F. The rainiest months in Tarapoto are March, April, February, and May, with each month seeing an average of 10 inches of rainfall.