Scuba Diving in Catalina Island
Live conditions, water-clarity forecast, and thermocline data for scuba diving in Santa Catalina Island, CA. Open the app for a live verdict, tappable factor breakdown, and a 10-day forecast — free, no signup needed.
About Catalina Island
The best spearfishing island in California. Kelp forests on the front side, bluewater pelagic shots on the back side. Short ferry from LA/OC.
Notable species
Catalina Island is known for:
Typical water visibility
Summer visibility in Catalina Island typically ranges from 20–50 feet, depending on recent rain, river discharge, and swell mixing. Winter and post-storm windows can drop this significantly. Submarius's water-clarity forecast blends satellite turbidity (NOAA CoastWatch Kd490), river-plume detection, wave-mixing models, and community post-dive reports to predict how far you'll actually see on a given day — not just the summer average.
How the clarity forecast works →What Submarius shows for Catalina Island
- Verdict score (0–10). Aggregates wind, swell, tide, moon, and water clarity into one decisive number.
- Best window. The 2–3 hour stretch each day when conditions peak.
- 10-day forecast. Auto-scaled line graph showing which day this week is trending good.
- Water clarity forecast. Secchi-depth estimate with uncertainty bounds and the next best viz window.
- Free, anonymous. Check conditions with location on — no signup until you want to save spots or post reports.
Safety in the water
Submarius ships OCEARCH tagged-shark alerts, community shark sightings, SOS, and buddy GPS sharing — permanently free, regardless of subscription tier. For Catalina Island specifically, the app shows any recent tagged sharks within range and lets you enable push notifications for sightings on your active tiles.
Ready to check Catalina Island conditions?
Live data. Five-second verdict. No signup.