Scuba Diving · Hawaii

Scuba Diving in Big Island (Hawaii)

Kona side drops off faster than almost anywhere in the world: 1000ft contour within a mile of shore. Big blue marlin and yellowfin tuna within sight of the harbor.

Live conditions, water-clarity forecast, and water temperature for scuba diving in Big Island, HI. Open the app for a live verdict and a tappable factor breakdown, free, no signup. Pro extends the forecast to 8 days.

Open live conditions →

Conditions snapshot: Oct 5, 2026

Visibility

67 ft

44–98 ft range

Water

83°F

Wind

1 kts

Wave

2.5 ft

Swell

2.3 ft

Period

12.6s

Snapshot from Oct 5, 2026. Live values, factor breakdowns, and 8-day forecast in the app.

Notable species

Big Island (Hawaii) is known for:

Blue MarlinYellowfin TunaMahiOnoGiant Trevally

Typical water visibility

Summer visibility around Big Island (Hawaii) is commonly reported in the 50–120 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.

How the clarity forecast works →

Last 7 days of model reads

One model estimate recorded each morning (UTC) for Big Island (Hawaii). These are model estimates, not measurements; the low and high columns are the p10 to p90 range around the middle estimate.

Day	Low ft	Estimate ft	High ft
Oct 5	34	64	90
Oct 4	34	63	89
Oct 3	34	63	88
Oct 2	34	64	90
Oct 1	35	65	93
Sep 30	35	66	94
Sep 29	21	49	96

Table baked Oct 5, 2026; days the recorder missed are simply absent.

Clearest months at Big Island (Hawaii)

Model climatology from the baked clarity ceiling: the typical day and the best case (90th percentile) visibility for each month, with a seasonal algae bloom proneness flag. These are labelled model estimates, not measurements.

Month	Typical ft	Best case ft	Bloom risk
Jan	59	72	low
Feb	59	98	low
Mar	59	79	low
Apr	59	92	low
May	80	115	low
Jun	82	98	low
Jul	79	98	low
Aug	72	98	low
Sep	66	98	low
Oct	66	98	low
Nov	72	98	low
Dec	62	98	low

Ceiling artifact global-reef-v10-obis-world; table baked Oct 5, 2026.

What Submarius shows for Big Island (Hawaii)

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 Big Island (Hawaii) specifically, the app shows any recent tagged sharks within range and lets you enable push notifications for sightings on your active tiles.