There's nothing like an all-inclusive holiday in Isla Palma to refresh 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 February and March, with an average temperature of 28°C, while the coldest months are November and December, with an average of 27°C. February and January are the driest months, while October and August are the rainiest months.