If you're hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Leticia: 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 Leticia are March, January, February, and April, with each month seeing an average of 16 inches of rainfall.