Scuba Diving in Charleston

Notable species

Charleston is known for:

Typical water visibility

Summer visibility around Charleston is commonly reported in the 5–25 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 starts from this coast's typical clarity for the time of year, built from in water measurements and satellite ocean color, then subtracts wave stirring, river and runoff plumes, and tide movement to estimate how far you'll actually see, shown as a low to high range, not a seasonal average.

What Submarius shows for Charleston

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