Santa Rosa Island sits in the Pacific Ocean as part of the Channel Islands, reachable only by boat from Santa Barbara. Its seven sites cover kelp forests, reefs, pinnacles, and walls, with depths generally staying within recreational range. Water is cool year-round, typically between twelve and sixteen degrees Celsius, warmest in late summer and early autumn. Visibility is variable, spanning from five metres in surge-affected spots to thirty metres on clear days. Species recorded here include California sheephead, harbor seals, gorgonians, a variety of nudibranchs, and occasional great white and mako sharks. Currents and swell can be demanding, and conditions suit beginner to intermediate divers depending on the site, though all require boat access.
Monthly water temperature across Santa Rosa Island's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Temperatures run around twelve to thirteen degrees Celsius in winter and spring, rising to fifteen or sixteen degrees by late summer and early autumn, the warmest and often calmest period for diving. A drysuit or seven-millimetre wetsuit is advisable in all seasons given the consistently cool water.
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Water temperature around Santa Rosa Island ranges from about 12°C in May to 15°C in August, based on satellite sea-temperature data for its dive sites.
With water around 12–15°C, a 7mm or semi-dry suit works in Santa Rosa Island year-round.
Fin maps 7 sites in Santa Rosa Island (7 scuba diving sites).
Across Santa Rosa Island's dive sites, July, September and October are most often reported as the best months to visit.
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