There's nothing like an all-inclusive holiday in Rio Bueno to rejuvenate you, especially when you know what kind of weather to expect. Here's some information to help you choose when to book: The hottest months are usually July and August, with an average temperature of 28°C, while the coldest months are February and March, with an average of 25°C. February and March are the driest months, while October and September are the rainiest months.