Isla Mujeres, Yucatán tide times

Predictions: Open-Meteo Marine (MeteoFrance SMOC, 0.08° grid) — heights relative to MSL (not chart datum / LAT). Model-derived.

Model-derived from a global ocean grid. Useful indication; expect about ±45 minutes on average vs. a local harmonic gauge, individual stations vary widely. See /methodology for per-region detail. Not for navigation.

Conditions as of 16:00 local time. Refreshes daily.

Predictions: Open-Meteo Marine (MeteoFrance SMOC, 0.08° grid) — heights relative to MSL (not chart datum / LAT). Model-derived. · Not for navigation.

The angler tradition for major/minor fishing windows: major ≈3-hour windows around moon transit and opposition; minor ≈2-hour windows around moonrise and moonset. Times are America/Mexico City local. Folk tradition, not a scientific forecast.

Isla Mujeres is a narrow limestone island 13 km northeast of Cancún, 7 km long and at its widest barely 650 m across. The island splits two entirely different water environments: the western shore faces the sheltered Bahía de Mujeres, calm and clear, turquoise in the way Caribbean postcards promise; the eastern shore faces the open Caribbean with the full strength of the northeast trade winds generating a consistent rolling swell against the ironshore rock. The Caribbean is one of the world's most microtidal seas. At Isla Mujeres, the mean spring tidal range is 0.2–0.4 m — small enough that casual visitors rarely notice the tide at all. There are two tidal cycles per day, but the inequality between them and the shallow overall range mean that the water appears to most people as simply calm or rough depending on wind and swell, not rising and falling with any drama. The exceptions are the inshore reef zones and the narrow channel between the island and the Yucatan Peninsula mainland to the west. The channel that separates Isla Mujeres from the peninsula coast focuses the tidal exchange for the Bahía de Mujeres. On the flood tide, water moves north through this channel; on the ebb, it runs south. The current is perceptible rather than powerful — in the 0.5–1.0 knot range — but snorkellers in the zone near El Garrafón National Park on the southern tip of the island notice it as a directional pull. Divers are advised to plan their entry and exit on the ebb current near Punta Sur, using the south-running flow to return to the boat rather than swimming against it. El Garrafón National Park occupies the southern tip reef system. The reef here is partly degraded from hurricane damage and visitor pressure over the years but remains a functional snorkelling site with parrotfish, sergeant majors, and the occasional nurse shark resting in the channels between coral heads. The park operates glass-bottom boat tours alongside the snorkelling programme. The tidal change is small enough that the timing of a visit matters far less here than at temperate reefs — water clarity is governed more by wind direction and recent storms than by tidal stage. Punta Sur, the southernmost point of Isla Mujeres, is also technically the easternmost point of Mexico. The lighthouse at Punta Sur marks a rocky promontory where the Caribbean swell wraps around the tip and meets water from the channel — a confused, irregular sea that is interesting to watch from the cliffs but not somewhere to swim. The sculpture garden at Punta Sur, built among the ironshore rock, is accessible on foot via a path from the road. The MUSA (Museo Subacuático de Arte) underwater sculpture museum has installations at 4–8 m depth in two sites: one off the western shore near Isla Mujeres and one off Cancún. The installations are visited by snorkellers in the shallower sections and by scuba divers throughout. Statues of cast-iron figures populate the seabed in formations designed to attract coral growth — and after 15 years of submersion, the colonisation is substantial. The tidal range at MUSA is small enough to be irrelevant to dive planning; visibility and current — which tracks the tidal exchange in the channel — are the key variables. The best visibility typically occurs during the dry season, November through April. Sea turtle nesting on Isla Mujeres runs from May through September, with green and loggerhead turtles using the northern beaches. The low tidal range means nesting turtles encounter relatively stable beach conditions compared to higher-tidal coasts; females select nest sites based on sand temperature and moisture rather than tidal history. Conservation volunteers patrol the northern beaches from dusk through midnight during nesting season. Visitors are permitted to observe at a distance from designated viewpoints. Whaleshark aggregation season runs June through September, centred on a zone called Afuera approximately 35 km northeast of Isla Mujeres. The whale sharks gather in surface waters where gulf-stream upwelling concentrates fish eggs, primarily from little tunny spawning. Tour boats depart from Isla Mujeres and Cancún from early morning. On the boat ride out, the tidal stage determines whether the departure from the island's dock is at low ramp angle or high; the aggregation zone itself is open ocean and irrelevant to tidal planning. Isla Mujeres has no cars for most visitors — golf carts and bicycles are the standard transport, available for rent from dozens of outlets on the main avenue. The ferry crossing from Puerto Juárez in Cancún takes 15–20 minutes on the passenger ferry and the calm of the Bahía de Mujeres makes it comfortable at any tidal stage throughout the year. Tide data for Isla Mujeres, Yucatán comes from the Open-Meteo Marine API, a gridded model product. Timing accuracy is ±45 minutes, height accuracy ±0.3 m — usable for trip planning, not for navigation.