Scuba Diving · Florida Keys

Scuba Diving in Key West

Southernmost reef structure in the continental US. Marquesas and Dry Tortugas trips for permit, tarpon, and offshore pelagics. Shallower patch reefs inshore for snapper and grouper.

Live conditions, water-clarity forecast, and thermocline data for scuba diving in Key West, FL. Open the app for a live verdict, tappable factor breakdown, and an 8-day forecast — free, no signup needed.

Open live conditions →

Conditions snapshot — May 31, 2026

Water

86°F

Wind

5 kts

Wave

0.6 ft

Swell

0.6 ft

Period

3.4s

Snapshot from May 31, 2026. Live values, factor breakdowns, and 8-day forecast in the app.

Notable species

Key West is known for:

PermitTarponYellowfin TunaWahooMutton Snapper

Typical water visibility

Summer visibility around Key West is commonly reported in the 30–80 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 Key West

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 Key West specifically, the app shows any recent tagged sharks within range and lets you enable push notifications for sightings on your active tiles.