Planning for the weather is a good way to make your trip to Tepoztlán relaxing and enjoyable, especially when you're splurging. The hottest months are usually April and May, with an average temperature of 21°C, while the coldest months are January and December, with an average of 16°C. The rainiest months in Tepoztlán are September, June, August and July, with each month seeing an average of 258 mm of rainfall.