There's nothing like an all-inclusive holiday in Palma Roja to refresh you, especially when you know what kind of weather to expect. Here's some information to help you decide when to book: The hottest months are usually September and January, with an average temperature of 25°C, while the coldest months are July and August, with an average of 23°C. September and August are the driest months, while April and May are the rainiest months.