If you're hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Tamanique: The hottest months are usually March and April with an average temp of 77°F, while the coldest months are January and December with an average of 75°F. The rainiest months in Tamanique are September, June, October, and May, with each month seeing an average of 10 inches of rainfall.