There's nothing like an all-inclusive holiday in Gillam 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 July and August, with an average temperature of 14°C, while the coldest months are February and January, with an average of -19°C. February and December are the driest months, while August and July are the rainiest months.