Ocean intelligence for Miami.
Miami sits at the convergence of three distinct ocean environments — the shallow flats of Biscayne Bay, the shipwreck-dotted Atlantic just past Government Cut, and the Gulf Stream edge minutes offshore where sailfish and mahi stream through year-round. Submarius reads all three, weights them per activity, and gives you a verdict. Free, no signup.
Choose your activity
Outer reef tracts, ledges off Haulover, and bluewater runs from the inlets. Water-clarity forecast + tide + moon in one verdict.
Artificial reefs, deep wrecks, and natural reef tract. Viz forecast, surface conditions, and current context per dive site.
Bonefish on the flats, tarpon in Government Cut, sailfish and mahi offshore. Bite score combines tide, moon, solunar, and pressure trend.
How Miami's ocean actually behaves
Three zones run through almost every conditions question for Miami:
- Biscayne Bay and the flats. Shallow, tide-driven, and sensitive to rainfall and sediment pushed off the shoreline. Tide stage governs viz and fish behavior more than anywhere else in the region.
- The inlet zone (Government Cut, Haulover). High-current passes where bay water and ocean water exchange. Bonito, tarpon, snook, and jacks concentrate here on moving tides.
- The outer reef and Gulf Stream edge. Typically clearer water, stable temperatures, and pelagic traffic when the Stream pushes close to shore. Ledges at 60–120 ft hold the full reef-fish complex plus structure-oriented amberjack and grouper.
Submarius reads conditions at sub-kilometer resolution, so a forecast for your Biscayne Bay spot isn't the same as one for Government Cut or the outer reef — and it shouldn't be.
Water clarity in Miami
Miami's clarity can swing by 30+ feet from one day to the next. Strong incoming tides can lift sediment off the Biscayne flats and spread it across the inshore reef. Sustained easterly winds stir up the outer reef. Heavy rain upstream pushes plume water through the inlets. None of that shows up on a wave-height app.
Our clarity forecast combines NOAA CoastWatch Kd490 satellite turbidity, USGS river-plume detection, wave-mixing models, and community post-dive reports. Every estimate carries an explicit uncertainty range. Honest bounds are better than a confident-but-wrong number.
How the clarity forecast works →Safety in Miami's water
Miami is shark country year-round — bulls, blacktips, lemons, hammerheads, and the occasional tiger. Submarius surfaces OCEARCH tagged-shark positions and community sightings on the map, with push notifications for sightings in your active tiles. Buddy GPS sharing and SOS are one tap away. All safety features are permanently free, regardless of subscription tier.