Planning for the weather is an important factor for making your trip to Xul-Ha a success, especially when you're splurging. The hottest months are usually May and August with an average temp of 81°F, while the coldest months are January and December with an average of 75°F. The rainiest months in Xul-Ha are June, September, October, and August, with each month seeing an average of 8 inches of rainfall.