Sargassum at Mar de Tumbo Beach: today's conditions
Heavy
Heavy pile-up, skip it
South of San Pedro town, Mar de Tumbo Beach runs along the resort and residential stretch of lower Ambergris Caye. The pace is calmer than downtown: fewer piers, more loungers, the reef still drawing its white line across the horizon.
Every morning FanGass grades conditions here with a simple index, 0 to 5, so one glance tells you how the day starts. A sector map puts Mar de Tumbo in context and the daily bulletin describes what the shoreline actually looks like, from clear water to scattered strands or a beached mat.
Mar de Tumbo Beach on the sargassum map
What to know about this beach
Mar de Tumbo shares the exposure of the caye's whole eastern coast: it faces the open Caribbean across the barrier reef, and material driven west on the prevailing easterlies reaches this seaboard ahead of any other part of the island. The coral strains some of it out, never all of it.
Being south of the centre gives the beach its own behaviour. The sand runs more continuously than between the town piers, so a landing spreads out instead of jamming against dock pilings. On heavy days the practical escape lies across the island on the lagoon shore, at Secret Beach, beyond the reach of the direct flow.
Frequently asked questions
Is Mar de Tumbo hit harder than downtown San Pedro?
The exposure is identical: due east, straight at the reef. What changes is the shape of the shore, more regular south of town, where a landing spreads out instead of wedging between piers.
When is the best season at Mar de Tumbo?
Regional sargassum traffic generally concentrates from spring to late summer. Outside that window the morning score stays low most days along the east coast of Ambergris Caye.
Can I follow conditions before I even fly in?
Yes. The 0 to 5 score on this page is rebuilt every morning from satellite imagery of the sector, so you can watch the trend for days ahead of your stay and pick your base accordingly.
Is Secret Beach a realistic fallback from Mar de Tumbo?
It is the classic one: facing the lagoon, away from the easterly flow, it stays clear far more often than the ocean side. The crossing is a cart ride through the island from the San Pedro area.