If you're hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Japuiba: The hottest months are usually February and January with an average temp of 77°F, while the coldest months are July and August with an average of 68°F. The rainiest months in Japuiba are January, December, March, and February, with each month seeing an average of 10 inches of rainfall.