The rainy season in Tulum lasts between June and October, with August and September being the most likely months, but the rain does not prevent you from enjoying this incredible destination. Tulum experiences its rainiest weather during June, September and October. It usually only rains for a short time and then the sun rises again. It's rare for it to be cloudy and rain all day, so rainy weather is unlikely to ruin your vacation.
However, in the event of a severe tropical storm or hurricane, you may want to reconsider the timing of your trip. If you are visiting Tulum during the month of June, expect humidity to be at its peak. The hurricane season also starts in June. In June, September and October there is more rain (and humidity).
From June to October, you can also expect some rain in Tulum. The good news is that rain is mostly short showers that pass quickly, and you can enjoy the warmth and sunshine the rest of the time. You can get great deals on hotels in Tulum during this season, when prices and visitors are at their lowest level. The hurricane season will theoretically increase, although I don't remember when was the last time I saw a hurricane in Tulum in July.
The low season really starts in Tulum in June; this is the time to visit it if you want few crowds, the best hotel deals and a quieter vacation. Their food is healthy and delicious but expensive (like almost all the food in the beach area) but if you want to try other restaurants, they are very close to many of the best restaurants in Tulum. The first is the Turtle Festival, which is a three-day festival focused on the conservation of sea turtles; many large hotels in Tulum sponsor this event. When I lived in Cancun, Tulum was my favorite weekend getaway to spend some time with friends on its endless beaches until the sun went down.
In case you miss the bus in Cancun, you can take an ADO bus to Playa del Carmen; the bus schedule from Playa del Carmen to Tulum is much more frequent than from Cancun to Tulum. The second event is Halloween, it's not a spectacular celebration in Tulum; there are only small parties, but it's still very nice. Tulum is unique because it is the only Mayan city built on the coast, and one of the few that was protected by a wall on three sides; in the fourth, it overlooks the sea. In addition to ruins and beaches, cenotes are one of the main reasons to visit Tulum, with hundreds of cenotes within walking distance of the city.
While the name “Cancun” may be more recognizable to tourists, further down the coast, the beautiful coastal city of Tulum is slowly gaining popularity. If you're in Tulum in March, visit the Mayan festival of Alborada, which is exclusive to Tulum, and an intriguing mix of Mayan and Catholic traditions. There are also music festivals such as Sound Tulum and Arena Festival International that attract music lovers and party people to the city. As Tulum grows in popularity as a tourist destination, more and more accommodation options emerge.
For those of you who only have a week or a few days and want to make the most of that time, I recommend going to Tulum from late December to March; these months are also known as high season.