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Blue Hole
Dive site · Guam
Experienced divers only
Is it worth the trip?
91Good out of 100 for your dates
2 days tie for best
Tue 3 · 91 out of 100
- Sea
- 0.6 m
- Wind
- 8 kn
- Gusts
- 12kn
- Air
- 30°C
Wed 4 · 91 out of 100
- Sea
- 0.6 m
- Wind
- 6 kn
- Gusts
- 8kn
- Air
- 30°C
Thu 5 · 89 out of 100
- Sea
- 0.6 m
- Wind
- 13 kn
- Gusts
- 21kn
- Air
- 29°C
Fri 6 · 90 out of 100
- Sea
- 0.6 m
- Wind
- 11 kn
- Gusts
- 14kn
- Air
- 29°C
Sat 7 · 92 out of 100
- Sea
- 0.5 m
- Wind
- 2 kn
- Gusts
- 10kn
- Air
- 28°C
Sun 8 · 92 out of 100
- Sea
- 0.4 m
- Wind
- 9 kn
- Gusts
- 13kn
- Air
- 30°C
Mon 9 · 91 out of 100
- Sea
- 0.4 m
- Wind
- 11 kn
- Gusts
- 16kn
- Air
- 30°C
Tap a day for sea, wind and water. Full forecast
Forecast: next 10 days
Full forecast- Mon 289, good
- Tue 391, good
- Wed 491, good
- Thu 589, good
- Fri 690, good
- Sat 792, good
- Sun 892, good
- Mon 991, good
- Tue 1092, good
- Wed 1192, good
The site in five facts
- Down to 40 mits deepest
- From a boathow you get in
- Experienced / deepexperienced divers only
- Water 30 °Crash vest or 1 to 2 mm
- Faces SWswell from there reaches it
Full forecast
every day, every number
The score doesn't know currents, the visibility on the day or your certification.
Suits experienced divers only, as a dive guide states it. Scored for experienced divers.
| Day | Score | Sea | Wind | Gusts | Air |
|---|---|---|---|---|---|
| Mon 2Nov | 89, good | 1.0 m | 6 kn | 11kn | 28°C |
| Tue 3Nov | 91, good | 0.6 m | 8 kn | 12kn | 30°C |
| Wed 4Nov | 91, good | 0.6 m | 6 kn | 8kn | 30°C |
| Thu 5Nov | 89, good | 0.6 m | 13 kn | 21kn | 29°C |
| Fri 6Nov | 90, good | 0.6 m | 11 kn | 14kn | 29°C |
| Sat 7Nov | 92, good | 0.5 m | 2 kn | 10kn | 28°C |
| Sun 8Nov | 92, good | 0.4 m | 9 kn | 13kn | 30°C |
| Mon 9Nov | 91, good | 0.4 m | 11 kn | 16kn | 30°C |
| Tue 10Nov | 92, good | 0.4 m | 9 kn | 15kn | 30°C |
| Wed 11Nov | 92, good | 0.4 m | 7 kn | 10kn | 28°C |
Sea is the waves near the site, in metres; wind and gusts in knots. "Boats in": gusts that keep dive boats in. More
Tide
- Mon 2 NovLow 07:07 −0.5 mHigh 14:48 +0.3 mLow 20:39 +0.0 m
- Tue 3 NovHigh 00:59 +0.2 mLow 08:12 −0.4 mHigh 15:32 +0.3 mLow 21:41 −0.1 m
- Wed 4 NovHigh 02:40 +0.2 mLow 09:17 −0.3 mHigh 16:11 +0.3 mLow 22:33 −0.1 m
Local clock times; heights about mean sea level. On open coasts the times are usually within a quarter of an hour; in bays, estuaries and on the Gulf of Mexico they can be an hour or more out. Slack water, the safest time to dive where there is current, is about half an hour either side of each high and low. Tide: EOT20 global ocean tide model, Hart-Davis et al. 2021, DGFI-TUM (doi:10.17882/79489), CC BY 4.0. Times and heights computed by us. A model, not a tide table: check a local table before you go.
Forecast updated . It refreshes every three hours. Forecast data: ECMWF, DWD, Météo-France and NOAA, served by Open-Meteo.com (CC BY 4.0). Changed by us. Generated using E.U. Copernicus Marine Service Information.
Map
the site, its town, photos
Blue Hole on Google Maps · Directions
Each place wears its best day on these dates: green good, amber fair, pale red poor, as the key says.
The map needs JavaScript. Every place on it is listed on this page, and each place's page links to Google Maps.
One finger scrolls the page; two fingers move the map. Pins are our own positions. Map OpenFreeMap, © OpenMapTiles, data © OpenStreetMap contributors.
Photos of Blue Hole
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More diving near here
5 places
- Shark Pit 0.2 km away
- Gab Gab Reef 2.1 km away
- American Tanker 3 km away
- Fish Eye Marine Park 3.2 km away
- Dogleg Reef 3.6 km away
About
the place in full, sources, credits
About Blue Hole
A cave dive. It goes down to 40 m. You get in from a boat. It suits experienced divers only, as a dive guide states it. The coast faces SW: swell from the SW reaches it, and wind from the NE blows out to sea. 1 dive centre or shop within 10 km, the nearest 9.4 km away. The sea is about 28°C in February, its coldest month (3 mm wetsuit), and 30°C in June, its warmest (rash vest or 1 to 2 mm). The town to stay in is Agat. Within 5 km we also list 3 surf spots, 1 wind sports spot and 8 dive sites.
- What it is Cave.
- How deep Down to 40 m.
- Getting in From a boat.
- Who it suits Suits experienced divers only, as a dive guide states it.
- Dive centres 1 dive centre or shop within 10 km, the nearest 9.4 km away.
Water about 30°C: rash vest or 1 to 2 mm. Typical sea temperature for the time of year, not a forecast.
Visibility over 30 m. Typical for the time of year, estimated from ten years of NASA satellite water clarity, not a forecast. Clearest in Jan, Feb, Mar, Apr, May, Jun, Jul, Sep, Oct, Nov and Dec (over 30 m).
The score is the conditions only: the journey, the price and the partners never change it (how we score, how we earn).
Rough cost (estimate): about US$1,220–US$2,390 each
about US$1,220–US$2,390 each · 6 nights, 2 sharing: flights, taxi, stay, food.
Our estimate from typical public prices, not a quote: check the real prices before you book (where they come from). Prices are about, in US Dollar (USD): our pound figures at the European Central Bank's rate of 2 November 2026.
How we worked it out
| What | How we worked it out | Each |
|---|---|---|
| Flights | return ORD to GUM, estimated from distance and season, changing at HNL, full-service airlines, with a hold bag | about US$751–US$1,560 |
| Taxi | airport and back, shared | about US$47–US$81 |
| Stay | 6 nights, a mid-range double, shared | about US$201–US$329 |
| Food | 7 days eating out | about US$221–US$416 |
| Total | about US$1,220–US$2,390 |
Guided dives are not priced yet: we have no sourced price, so it is not in it. Prices from public sources, checked in 2026.
Where to stay: Agat
Ad Links marked Ad may pay us if you book. You pay the same, and they never change a score. How we earn
about 15 min by car · 3 places to stay
About Agat its beds, food and every spot near it
Drives are estimates. Prices are about, in US Dollar (USD): our pound figures at the European Central Bank's rate of 2 November 2026.
Getting there: about 25h
About 25h door to door from Chicago
Fly ORD → GUM, changing at Daniel K. Inouye International Airport (HNL), then 40 min by road
Flights ORD → GUM on your dates · AviasalesAdeSIM for your phone · Search on AiraloAd
An estimate, one way; the journey never changes the score.
In the water
Dives and courses in Agat · GetYourGuideDive gear hire in Agat · GetYourGuide
Dive centres nearby
MDA (Piti Shop) 9.4 km
The nearest named dive centres and shops within 25 km, in a straight line; training agencies where the map states them. Listings, not a recommendation. Dive centres: © OpenStreetMap contributors (ODbL). Credits
What you might see
Too few records at this site itself, so these are the animals divers and surveys have recorded at other sites within 25 km in the last 15 years. A record says someone saw it there, not that you will.
Scalloped hammerhead Sphyrna lewiniShark
Seen in 15 records, mostly Sep to Jan.
Pomacentrus vaiuliDamselfishes
Seen in 68 records, mostly Mar to May.
Lavender Tang Acanthurus nigrofuscus
Seen in 47 records, mostly Mar to May.
Lined Bristletooth Ctenochaetus striatus
Seen in 43 records, mostly Mar to May.
Chrysiptera traceyiDamselfishes
Seen in 35 records, mostly Mar to May.
Stegastes lacrymatusDamselfishes
Seen in 33 records, mostly May to Aug.
Orangespine unicornfish Naso lituratus
Seen in 32 records, mostly Mar to May.
Bullethead Parrotfish Chlorurus spilurus
Seen in 28 records, mostly Mar to May.
Blackfin Cod Cephalopholis urodeta
Seen in 26 records, mostly Mar to May.
Fivestripe wrasse Thalassoma quinquevittatum
Seen in 23 records, mostly Mar to May.
Boomerang triggerfish Sufflamen bursa
Seen in 22 records, mostly Mar to May.
Orange-lined triggerfish Balistapus undulatus
Seen in 21 records, mostly Mar to May.
Records: OBIS (Ocean Biodiversity Information System, IOC-UNESCO) and GBIF.org (1 November 2026, doi:10.15468/dl.jeesns), from the datasets named here, CC0 and CC BY records only. Names: WoRMS and GBIF; common names from the Catalogue of Life, the GBIF Backbone and Wikidata. Largest datasets here: NOAA Pacific Islands Fisheries Science Center, Ecosystem Sciences Division, National Coral Reef Monitoring Program: Stratified random surveys (StRS) of reef fish in the U.S. Pacific Islands; Vertebrate Zoology Division - Ichthyology, Yale Peabody Museum; iNaturalist Research-grade Observations; Natural History Museum (London) Collection Specimens; INSDC Sequences. Credits
This week's visibility and the current no free forecast gives. Ask a dive centre before you book.