If you're hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Fernando de Noronha: The hottest months are usually April and May, with an average temperature of 27°C, while the coldest months are August and September, with an average of 26°C. The rainiest months in Fernando de Noronha are April, March, May and June, with each month seeing an average of 252 mm of rainfall.