Conditions & tides
Scored by DiveConnect's site-physics model
Marine forecast via Copernicus Marine. Score is a rule-based guide from swell/wind vs. the site's exposure — always dive your own assessment.
Dived here today? How were conditions vs. what we showed?
About this site
Half Moon Bay sits along the San Mateo County coast of northern California, south of San Francisco on the Pacific shoreline. The area is known for its open coastline and reefs exposed to swell from the open ocean, with dive access typically arranged through local boat operators out of Pillar Point Harbor. The site is rated a beginner dive.
AI overviewMarine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
Ochre Sea StarPisaster ochraceusReported here · unconfirmed
Hopkins' Rose NudibranchCeratodoris rosaceaReported here · unconfirmed
Opalescent NudibranchHermissenda opalescensReported here · unconfirmed
Spotted DoridTriopha maculataReported here · unconfirmed
San Diego DoridDiaulula sandiegensisReported here · unconfirmed
Bat StarPatiria miniataReported here · unconfirmed
Monterey DoridDoris montereyensisReported here · unconfirmed
Clown DoridTriopha catalinaeReported here · unconfirmed
Black and White DoridAcanthodoris rhodocerasReported here · unconfirmed
Striped Shore CrabPachygrapsus crassipesReported here · unconfirmed
Durable tips from divers — access, hazards, marine life, facilities. For day-of conditions, use the report tool in the conditions card above.
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