Planning for the weather is a good way to make your trip to Angra dos Reis relaxing and enjoyable, especially when you’re splurging. 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 Angra dos Reis are January, December, March, and February, with each month seeing an average of 10 inches of rainfall.