There’s nothing like an all-inclusive vacation in Long Caye to rejuvenate you, especially when you know what kind of weather to expect. Here’s some info to help you choose when to book: The hottest months are usually September and August with an average temp of 81°F, while the coldest months are January and December with an average of 76°F. April and February are the driest months while June and October are the rainiest months.