Weekly water clarity report

US Coastal Water Clarity — Week of Sep 28-Oct 4, 2026

Published Oct 6, 2026

US coastal water clarity this week: 6 regions with no comparable prior week.

Regional clarity model read — feet01020304050Hawaii52.5 ftFlorida Keys & South Atlantic32.5 ftMid-Atlantic & Gulf Coast27.4 ftSouthern California21.7 ftFlorida Gulf Coast17.4 ftNortheast Atlantic12.7 ftimprovingstabledecliningno comparisonno data

Regional reads

Florida Keys & South Atlantic 32.5 ft no comparison

Submarius's clarity model read Florida Keys & South Atlantic at 32.5 ft regional average; no comparable prior week to measure a change against.

Florida Gulf Coast 17.4 ft no comparison

Submarius's clarity model read Florida Gulf Coast at 17.4 ft regional average; no comparable prior week to measure a change against.

Southern California 21.7 ft no comparison

Submarius's clarity model read Southern California at 21.7 ft regional average; no comparable prior week to measure a change against.

Hawaii 52.5 ft no comparison

Submarius's clarity model read Hawaii at 52.5 ft regional average; no comparable prior week to measure a change against.

Northeast Atlantic 12.7 ft no comparison

Submarius's clarity model read Northeast Atlantic at 12.7 ft regional average; no comparable prior week to measure a change against.

Mid-Atlantic & Gulf Coast 27.4 ft no comparison

Submarius's clarity model read Mid-Atlantic & Gulf Coast at 27.4 ft regional average; no comparable prior week to measure a change against.

How the model works

Submarius estimates horizontal underwater visibility for any coastal point. It starts from that location's typical clarity for the time of year, built from in water measurements and satellite ocean color, then subtracts what changes day to day: wave stirring judged against depth and bottom type, river and runoff plumes, and tide driven water movement. Each estimate shows its data sources and how fresh they are. The underlying optics draw on Lee et al. 2015. See the methodology overview, the plain English conditions guide, and the glossary for the full picture.

Per-location and arbitrary-lat/lon clarity reads are available in the Submarius app. This weekly report publishes only regional aggregates so the model's recipe stays protected while the outcomes stay public.

Want this in the app?

Live verdict, water clarity bands, and a 2 day forecast at your spot — free, no signup. Pro adds the 8 day outlook.

Open Submarius

Model read taken Oct 5, 2026 at 06:31 UTC. Subscribe via RSS.