There's nothing like an all-inclusive holiday in Mount Mulligan 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 December and November, with an average temperature of 24°C, while the coldest months are August and July, with an average of 19°C. September and August are the driest months, while January and February are the rainiest months.