There's nothing like an all-inclusive holiday in Tijuana 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 August and September, with an average temperature of 22°C, while the coldest months are February and January, with an average of 14°C. June and July are the driest months, while February and December are the rainiest months.