Submarius
Scuba Diving in Oahu
Known for bluewater spearfishing — mahi, wahoo, and yellowfin tuna off the offshore FAD buoys. North Shore surf breaks in winter are a major draw.
Live conditions, water-clarity forecast, and thermocline data for scuba diving in Oahu, HI. Open the app for a live verdict, tappable factor breakdown, and an 8-day forecast — free, no signup needed.
Notable species
Oahu is known for:
Typical water visibility
Summer visibility around Oahu is commonly reported in the 40–100 ft range — a community-guidance estimate, not a measurement. Rain, river discharge, swell mixing, and seasonality can shift real conditions dramatically day to day.
That's exactly why Submarius exists. The in-app clarity forecast blends satellite turbidity (NOAA CoastWatch Kd490), river-plume detection (USGS), wave-mixing physics, and community post-dive reports to estimate how far you'll actually see tomorrow — with explicit uncertainty bounds, not a seasonal average.
How the clarity forecast works →What Submarius shows for Oahu
- 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.
- 8-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 Oahu specifically, the app shows any recent tagged sharks within range and lets you enable push notifications for sightings on your active tiles.