Planning for the weather is a good way to make your trip to Sayula relaxing and enjoyable, especially when you're splurging. The hottest months are usually May and April with an average temp of 70°F, while the coldest months are January and February with an average of 63°F. The rainiest months in Sayula are August, July, September, and June, with each month seeing an average of 14 inches of rainfall.