There's nothing like an all-inclusive holiday in Lizard Island to rejuvenate you, especially when you know what kind of weather to expect. Here's some information to help you decide when to book: The hottest months are usually December and January, with an average temperature of 27°C, while the coldest months are August and July, with an average of 23°C. September and August are the driest months, while January and March are the rainiest months.