If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Príncipe Island: The hottest months are usually March and April, with an average temperature of 28°C, while the coldest months are July and August, with an average of 25°C. The rainiest months in Príncipe Island are November, October, December and April, with each month seeing an average of 249 mm of rainfall.