Sargassum at Rainbow Beach (St Croix): today's conditions
Clear
Clean, hit it
Rainbow Beach sits just north of Frederiksted, on the west coast of St Croix. People come for calm water, late afternoons facing the sunset and the laid-back feel of the beach bars along the sand.
This page tracks how sargassum behaves on this shore: each morning's bulletin assigns Rainbow Beach a mark from 0 to 5, and the map places it within the island's western sector. A simple reflex before loading the cooler into the car.
Rainbow Beach (Frederiksted) on the sargassum map
What to know about this beach
St Croix lives apart from the rest of the archipelago, set off to the south across the passage from St Thomas and St John. On this broad island the mechanics stay familiar: the easterly flow hits the eastern coast first, around Chenay Bay, while the west-facing Frederiksted shore, sitting with its back to the trades, ranks among the most sheltered in the whole destination.
Facing due west, Rainbow Beach usually meets sargassum only at the end of its journey, once a tongue of weed has worked around the island by the north or the south. Those detours take time and scatter the mats, so the beach keeps its clear water on most days even when eastern St Croix is flagged.
Frequently asked questions
Does St Croix follow the same calendar as St Thomas?
The regional season is the same, but the island sits apart, further south: its arrivals do not always line up day for day with the rest of the archipelago. Follow the rating specific to the Frederiksted sector.
Is the west coast really the right side of the island?
It is the most sheltered face: the flow reaches St Croix from the east, over by Chenay Bay, and has to work around the whole island before touching Rainbow Beach. Flagged days are rare here.
Can I count on a clear sunset swim?
Most of the time, yes: the water stays clear on this coast for the bulk of the year. A check of the rating that same morning is enough to confirm the evening looks open.
When should I pay the most attention?
From spring to late summer, when mats move through the region in numbers. Even then, western St Croix sees only a small share of what lands on the eastern coast.