YO-21

United States

YO-21

30–35 mMax Depth
boatEntry
2Species

Conditions Summary

Model forecast · local time (GMT-10)

Model conditions signal81/100
Waves
1.2 m
6.7 s
Swell
0.4 m
11.9 s
Current speed
0.9 km/h
flowing toward N
Water temperature
27.4°C
Wind
38.2 km/h
→ E
Sea level
0.4 m
falling
WavesChallenging
SwellCalm
Current speedCalm
Planning window
08:00–09:00
Calmest model window

Forecast Overview

Tue, Oct 20Challenging
Waves1.1–1.2 mCurrent speed0.9 km/h maxWater temperature27.4°C
TodayWatch
Waves0.9–1.1 mCurrent speed1.2 km/h maxWater temperature27.4°C
TomorrowWatch
Waves0.8–1.0 mCurrent speed1.5 km/h maxWater temperature27.5°C
Fri, Oct 23Watch
Waves0.8–0.9 mCurrent speed0.9 km/h maxWater temperature27.5°C
Next 72 hours
17:00
Waves: 1.2 m
Current speed: 0.9 km/h
Water temperature: 27.4°C
23:00
Waves: 1.1 m
Current speed: 0.9 km/h
Water temperature: 27.4°C
05:00
Waves: 1.0 m
Current speed: 1.2 km/h
Water temperature: 27.3°C
11:00
Waves: 1.0 m
Current speed: 0.6 km/h
Water temperature: 27.4°C
17:00
Waves: 1.0 m
Current speed: 0.7 km/h
Water temperature: 27.4°C
23:00
Waves: 1.0 m
Current speed: 0.6 km/h
Water temperature: 27.3°C
05:00
Waves: 0.8 m
Current speed: 1.4 km/h
Water temperature: 27.3°C
11:00
Waves: 0.8 m
Current speed: 0.8 km/h
Water temperature: 27.6°C
17:00
Waves: 0.8 m
Current speed: 1.1 km/h
Water temperature: 27.8°C
23:00
Waves: 0.8 m
Current speed: 0.4 km/h
Water temperature: 27.5°C
05:00
Waves: 0.8 m
Current speed: 0.8 km/h
Water temperature: 27.3°C
11:00
Waves: 0.8 m
Current speed: 0.4 km/h
Water temperature: 27.7°C
Catalog depth30–35 m
Data sources & field guideOpen-Meteo Marine + Weather APIs

Planning context, not a safety guarantee. Coastal model accuracy is limited. Confirm the actual briefing, entry, exit, and suitability with a local operator.

Open-Meteo Marine + Weather APIs →

Dive readiness

Collecting the latest marine conditions and forecast signals.

Seasons · water temperature

12-month outlook

Best window

Year-round

Peak month

Sep 27.0°

Jan24.7°
Feb24.3°
Mar24.3°
Apr24.7°
May25.3°
Jun25.9°
Jul26.3°
Aug26.8°
Sep27.0°
Oct27.0°
Nov26.3°
Dec25.3°
Current: moderate
Typical visibility: 10 m

Historical planning data from the recorded site profile. Water temperature and conditions can vary by day, depth, and weather; confirm current conditions with a local operator.

Nearby live cameras

Check the water around YO-21 before you dive. Feeds are provided by third parties and may occasionally be offline.

1 camera

Maui Live Cam

31.7 km awayOpenStreetMap
Check is getting oldLast checked 47h ago

External source · live video is not independently verified

No history is stored for this external source.

Public feedCatalogued Oct 19, 2026

Live availability is controlled by each camera provider. Use the feed as a quick surface check and confirm current conditions with a local dive operator.

Explore nearby centers on the map

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Dive Types

wrecksalt Waterintermediate Difficulty

Questions to ask a local operator

  • What are today's current, visibility, entry, and exit conditions?
  • Does the planned route stay within my certification and recent experience?
  • Are there local permits, conservation rules, or equipment requirements?

Common Species

12 km · nearby observations
Atlantic green turtle
Chelonia mydas
DeepLog1
Striped sea urchin
Tripneustes gratilla
DeepLog1
Montipora patula
Nearby OBIS observations26
Montipora capitata
Nearby OBIS observations21
Porites lobata
Nearby OBIS observations11
Saddle wrasse
Thalassoma duperrey
Nearby OBIS observations11
Boomerang triggerfish
Sufflamen bursa
Nearby OBIS observations9
Humpback whale
Megaptera novaeangliae
Nearby OBIS observations9
Porites compressa
Nearby OBIS observations7
Brown surgeonfish
Acanthurus nigrofuscus
Nearby OBIS observations6
Hawaiian Hogfish
Bodianus albotaeniatus
Nearby OBIS observations6
Yellow tang
Zebrasoma flavescens
Nearby OBIS observations6
These are nearby biodiversity records, not a guarantee that every species will be seen on a particular dive.
DeepLog + OBIS →
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