The Best Time to Visit Tulum

The numbers are unambiguous: 31 to 58 mm of rain a month, highs between 26 and 29 °C, seven to twelve rain days. The sea is calm more often, the sargassum is usually at its lowest, and the light is the light that made this coast famous.

The costs are equally clear. Rooms are at their most expensive, Christmas and New Year at their most expensive of all, and the gates are at their busiest — mid-morning at the ruins in February is a queue of coach parties. It is also the season in which booking anything at short notice is hardest.

If you come in these months, the entire trick is timing your days rather than your weeks: gate at 08:00, water at eleven, and the middle of the day somewhere shaded.

May brings the first rains — 92 mm across 13.6 days — and immediately better prices. June is wetter on paper than almost any month, 195 mm, but the rain is afternoon rain and the mornings are as good as February's; it is the month with the widest gap between what the number looks like and what the day feels like. November dries out again to 90 mm and sits before the December price rise.

What you trade is certainty. In these months a boat day can be blown out, an afternoon can vanish into a downpour, and the sargassum is a live question. What you gain is a town that behaves like a town, gates without queues, and rooms at a third off.

This is the season this site would book, and the reason is on the weather page: the wind, not the rain, is what cancels things here, and wind does not follow the rainfall curve.

October averages 199 mm across 19.8 rain days and September 182 mm across 23 — rain on roughly three days in four, usually for an hour in the afternoon. This is the statistical peak of the Atlantic hurricane season, and it is when some smaller places on the beach road close for a few weeks.

What still works: everything inland. The cenotes are groundwater, Cobá and Muyil are forest sites, and the archaeological gates keep their hours. What does not: open-water days, which go with the wind rather than the rain.

Come in these months for the price and the emptiness, with travel insurance that covers weather disruption, a flexible booking if you can get one, and no plan that depends on a single boat morning.

Sargassum arrives on the Caribbean-facing beaches in the warmer half of the year, driven by ocean currents and nutrients rather than by local weather. Volumes swing wildly from year to year and week to week. State monitoring reports exist, but they are retrospective — they tell you what landed, not what will. Any site promising you a clean beach for a date months out is guessing.

What you can plan around is the alternative. Weed does not reach the cenotes, the lagoons or the sheltered water at Akumal in the same way, and the reserve at Sian Ka'an is a different environment altogether. A trip built on those is weed-proof; a trip built entirely on a beach chair is not.

Christmas and New Year are the year's most expensive fortnight and need booking months ahead. Semana Santa, the Mexican Easter week, fills the coast with domestic visitors and is the busiest week of the spring. North American spring break, spread across March, is the loudest stretch on the beach road.

Against those, Sunday is a weekly event worth knowing about: INAH admission is free that day for Mexican nationals and foreign residents, which makes Sunday morning the busiest hour of the week at the ruins and at Cobá in any month.

And one seasonal rule that is not about crowds at all: the beaches here are turtle nesting ground, and in the nesting months the national park asks visitors to keep lights off the sand at night.