If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Búzios: The hottest months are usually February and January with an average temp of 77°F, while the coldest months are August and July with an average of 71°F. The rainiest months in Búzios are November, December, January, and March, with each month seeing an average of 8 inches of rainfall.