There's nothing like an all-inclusive holiday in Karlovassi to revive 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 August and July, with an average temperature of 25°C, while the coldest months are January and February, with an average of 13°C. July and August are the driest months, while January and December are the rainiest months.