Northern Mariana Islands

The Grotto

5–18 mMax Depth

boatEntry

78Species

Conditions Summary

Model forecast · local time (GMT+10)

Planning signal71/100

Waves

1.4 m

8.6 s

Swell

1.2 m

7.0 s

Current speed

1.3 km/h

flowing toward SW

Water temperature

29.9°C

Wind

0.8 km/h

→ NE

Sea level

0.5 m

rising

WavesChallenging

SwellWatch

Current speedCalm

Forecast Overview

TodayChallenging

Waves1.4–1.4 mCurrent speed1.9 km/h maxWater temperature30.1°C

TomorrowChallenging

Waves1.1–1.3 mCurrent speed2.1 km/h maxWater temperature30.1°C

Tue, Sep 8Challenging

Waves1.1–1.2 mCurrent speed2.3 km/h maxWater temperature30.1°C

Wed, Sep 9Challenging

Waves1.2–1.2 mCurrent speed2.1 km/h maxWater temperature29.9°C

Next 72 hours

11:00

Waves: 1.4 m

Current speed: 1.3 km/h

Water temperature: 29.9°C

17:00

Waves: 1.4 m

Current speed: 1.5 km/h

Water temperature: 30.3°C

23:00

Waves: 1.4 m

Current speed: 1.9 km/h

Water temperature: 29.9°C

05:00

Waves: 1.2 m

Current speed: 1.7 km/h

Water temperature: 29.8°C

11:00

Waves: 1.1 m

Current speed: 1.8 km/h

Water temperature: 30.0°C

17:00

Waves: 1.1 m

Current speed: 1.7 km/h

Water temperature: 30.5°C

23:00

Waves: 1.1 m

Current speed: 1.5 km/h

Water temperature: 30.0°C

05:00

Waves: 1.2 m

Current speed: 1.5 km/h

Water temperature: 29.9°C

11:00

Waves: 1.2 m

Current speed: 1.5 km/h

Water temperature: 30.0°C

17:00

Waves: 1.2 m

Current speed: 2.0 km/h

Water temperature: 30.4°C

23:00

Waves: 1.2 m

Current speed: 1.6 km/h

Water temperature: 30.0°C

05:00

Waves: 1.2 m

Current speed: 1.9 km/h

Water temperature: 29.9°C

Catalog depth5–18 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

Nov-Jun

Peak month

Sep 29.5°

Jan27.7°

Feb27.3°

Mar27.3°

Apr27.9°

May28.6°

Jun29.3°

Jul29.4°

Aug29.4°

Sep29.5°

Oct29.2°

Nov28.9°

Dec28.3°

Current: moderate

Typical visibility: 20 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.

Explore nearby centers on the map

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Dive Types

cavesalt Wateradvanced Difficulty

Data source & current conditions

Profile facts were imported from DeepLog. ScubaProof adds nearby-center links and presents the recorded fields without treating missing data as confirmation. Conditions, access, permits, and site suitability can change; confirm them with a local operator before diving.

View the source profile →

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

Brown-spotted halgerda

Halgerda brunneomaculata

DeepLog13

Phyllidiella annulata

DeepLog11

Halgerda malesso

DeepLog10

Snakey bornella

Bornella anguilla

DeepLog5

Elegant phyllidia

Phyllidia elegans

DeepLog4

Nail sea star

Mithrodia clavigera

DeepLog4

Flame scallop

Ctenoides ales

DeepLog3

Fried egg sea slug

Colpodaspis thompsoni

DeepLog3

Orange fish

Pearsonothuria graeffei

DeepLog3

Sixblotch hind

Cephalopholis sexmaculata

DeepLog3

Bluefin trevally

Caranx melampygus

DeepLog2

Bluespine unicornfish

Naso unicornis

DeepLog2

These are nearby biodiversity records, not a guarantee that every species will be seen on a particular dive.

DeepLog + OBIS →

Photos