Planning for the weather is an important factor for making your trip to St. George’s Caye a success, especially when you’re splurging. 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. The rainiest months in St. George’s Caye are June, October, September, and August, with each month seeing an average of 10 inches of rainfall.