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AdvancedBoat entry

Blue Hole

Guam, United States
AOW suggested15–40 m depthBoat entryRash guard or 2mm shorty typical

Boat dive — see Entry & access.

Blue Hole at a glance

Blue Hole is an advanced boat dive site in Guam, United States with depths of 15.2–40 m (50–131 ft). Typically most favorable Jun · from 3 years of archive data. Divers commonly see Octopus, Anemonefish, and Moray eel. Recent reports put the water around 30°C (86°F). Check the latest conditions and entry details before you go.

Marine model · graded 13h ago
0.8 mwaves — under a meter expected

Tap a factor for its source and model point · Forecast 30°C · seasonal avg 30°C

Site hazards: Deep shaft, easy accidental over-depth, narcosis, strong current/drift exposure, brief overhead/cavern-like route, wall drop-off beyond recreational limits, boat pickup, and military/restricted shoreline nearby.

Read the full hazards ↓

Dive windows this week

Best: Sat
Sat7:00–19:00
Sun7:00–19:00
Mon7:00–19:00
Tue7:00–15:00
Wed7:00–9:00
Thu7:00–12:00
Fri—

Favorable windowModerate window— no window

First light 5:49 · Sunrise 6:10 · Sunset 18:25

Source: Open-Meteo marine · model point 6.8 km from site · graded 13h ago

Forecast only — always assess conditions on site.

Forecast · NOAA tide model

Tide & slack timing

Loading tide predictions

Recent diver reports

Dated firsthand observations from divers — not current conditions.

No diver reports for this site yet. — one dated observation helps every diver after you.

Dived here today — did the forecast match?

What Divers Say

Best time: Use a calm-weather, low-current window selected by local operators; avoid strong afternoon/current conditions.

Based on community reviews and site data. Conditions vary — always verify before diving.

Best months, historically

What conditions have historically been typical at this site, month by month — not a forecast.

  1. Jan11%29°C2.2 m
  2. Feb1%28°C2.2 m
  3. Mar32%28°C1.9 m
  4. Apr54%29°C1.5 m
  5. May73%29°C1.5 m
  6. Jun87%30°C1.1 m
  7. Jul78%30°C1.3 m
  8. Aug71%30°C1.3 m
  9. Sep73%30°C1.4 m
  10. Oct55%30°C1.6 m
  11. Nov22%29°C1.8 m
  12. Dec10%29°C2.0 m

June hastypically had the largest share of favorable days here. Conditions vary year to year — this is historical context, not a forecast.

Based on 3 years of archive data. Bar height shows the share of days each month whose conditions have historically scored favorably.

Marine life recorded at this site, by month

Recorded observations — evidence of past sightings, not a promise of what you’ll encounter.

Species seen here

  • Carcharhinus limbatus recorded here Apr (1 record)

    most recent 2012

  • Chelonia mydas recorded here Apr (1 record)

    most recent 2012

  • Gymnothorax flavimarginatus recorded here Apr (1 record)

    most recent 2012

  • Myliobatis aquila recorded here May (1 record)

    most recent 2013

  • Triaenodon obesus recorded here May (1 record)

    most recent 2013

Counts are occurrence records near this site from public biodiversity datasets (GBIF), grouped by calendar month across all sampled years. Sightings vary — past records are context, not a prediction.

The underwater calendar

When these animals are most recorded around Micronesia & western Pacific — from open sighting data, not a promise.

Watch the whole year animate on the Migrations map

Fills & rentals nearby

Facts from OpenStreetMap, corrected by the community — listed by distance only. Details change; confirm with the shop.

Shop facts come from OpenStreetMap and community corrections, shown nearest first. PickADive lists facts and contacts only — no listing is sponsored or ranked.

Data updated July 2026

Site details

Natural shaft/sinkhole off Orote Point, normally dived from a boat. Divers enter the opening on the reef top, descend through the blue-water shaft, and exit onto the outside wall near the recreational depth limit. The bottom continues far beyond recreational limits, so depth control is the central planning issue.

boatcavewall

Deep shaft, easy accidental over-depth, narcosis, strong current/drift exposure, brief overhead/cavern-like route, wall drop-off beyond recreational limits, boat pickup, and military/restricted shoreline nearby.

Reviews

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