There's nothing like an all-inclusive holiday in Mentone to rejuvenate you, especially when you know what to expect from the elements. Here's some information to help you decide when to book: The hottest months are usually June and July, with an average temperature of 30°C, while the coldest months are January and December, with an average of 12°C. February and April are the driest months, while September and May are the rainiest months.