There's nothing like an all-inclusive holiday in Kings Canyon National Park to revive 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 13°C, while the coldest months are February and January, with an average of -4°C. September and June are the driest months, while January and December are the rainiest months.