Planning for the weather is a good way to make your trip to Amatlán relaxing and enjoyable, especially when you’re splurging. The hottest months are usually April and May, with an average temperature of 23°C, while the coldest months are January and December, with an average of 19°C. The rainiest months in Amatlán are September, August, July and June, with each month seeing an average of 327 mm of rainfall.