There's nothing like an all-inclusive holiday in Termas del Arapey to revive 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 January and February, with an average temperature of 25°C, while the coldest months are July and June, with an average of 14°C. July and June are the driest months, while November and October are the rainiest months.