Submarius
Scuba Diving in Maui
Molokini Crater diving, Honolua Bay on calm days, plus bluewater trips between the islands. Winter humpback whale migration routes overlap fishing grounds.
Live conditions, water-clarity forecast, and water temperature for scuba diving in Maui, HI. Open the app for a live verdict and a tappable factor breakdown, free, no signup. Pro extends the forecast to 8 days.
Notable species
Maui is known for:
Typical water visibility
Summer visibility around Maui is commonly reported in the 40–100 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 Maui. 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 | 42 | 59 | 81 |
| Oct 4 | 42 | 64 | 82 |
| Oct 3 | 42 | 63 | 82 |
| Oct 2 | 42 | 58 | 80 |
| Oct 1 | 42 | 61 | 81 |
| Sep 30 | 41 | 54 | 79 |
| Sep 29 | 24 | 42 | 79 |
Table baked Oct 5, 2026; days the recorder missed are simply absent.
Clearest months at Maui
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 | 49 | 82 | low |
| Feb | 33 | 82 | low |
| Mar | 59 | 94 | low |
| Apr | 59 | 94 | low |
| May | 59 | 87 | low |
| Jun | 56 | 82 | low |
| Jul | 56 | 82 | low |
| Aug | 56 | 82 | low |
| Sep | 59 | 82 | low |
| Oct | 59 | 82 | low |
| Nov | 62 | 85 | low |
| Dec | 51 | 82 | low |
Ceiling artifact global-reef-v10-obis-world; table baked Oct 5, 2026.
What Submarius shows for Maui
- 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 Maui specifically, the app shows any recent tagged sharks within range and lets you enable push notifications for sightings on your active tiles.