It is easy to plan around the tropical climate of Tulum. There is not much variation in the temperature throughout the year (the average temperature hovers around 83deg F), but it's the rainy seasons that most tourists pay attention to.
The best weather is from January to April, which also sees the greatest influx of tourists. Some people can feel a little cold in the ocean, cenotes, and swimming pools that haven't been heated.
The hottest and rainiest months of the year are May through October. However, there is still plenty of sun and warm water to go snorkelling and diving. Hurricane season peak in September and October, so make sure to keep an eye out for the weather forecasts and get travel insurance in case of an emergency.
Many consider November and December to be the best months to visit Tulum on one of our many
Mexico tours. This is the end of hurricane season, so humidity is low. Evenings can get a bit cooler.