If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Guarapari: The hottest months are usually February and January, with an average temperature of 25°C, while the coldest months are August and July, with an average of 21°C. The rainiest months in Guarapari are December, November, March and January, with each month seeing an average of 186 mm of rainfall.