When you're dreaming of a getaway to Tarapacá, be sure to take into account the year-round temperatures. The hottest months are usually September and October with an average temp of 79°F, while the coldest months are July and June with an average of 77°F. The rainiest months in Tarapacá are March, January, February, and April, with each month seeing an average of 16 inches of rainfall.