Green Rock
Dive site · Thailand
Advanced divers and up
Is it worth the trip?
77Good out of 100 for your dates
Best on Thu 5: Sea: flat, Visibility about 15 m, Water 29 °C
Wed 4 · 80 out of 100
- Sea
- 0.1 mflat
- Wind
- 5 kn
- Gusts
- 10kn
- Air
- 28°C
Thu 5 · 81 out of 100
- Sea
- 0.1 mflat
- Wind
- 2 kn
- Gusts
- 6kn
- Air
- 28°C
Fri 6 · 73 out of 100
- Sea
- 0.1 mflat
- Wind
- 8 kn
- Gusts
- 11kn
- Air
- 28°C
Sat 7 · 78 out of 100
- Sea
- 0.2 mflat
- Wind
- 11 kn
- Gusts
- 17kn
- Air
- 28°C
Sun 8 · 77 out of 100
- Sea
- 0.2 mflat
- Wind
- 9 kn
- Gusts
- 15kn
- Air
- 28°C
Mon 9 · 69 out of 100
- Sea
- 0.2 mflat
- Wind
- 8 kn
- Gusts
- 22kn
- Air
- 27°C
Tue 10 · 70 out of 100
- Sea
- 0.3 m
- Wind
- 12 kn
- Gusts
- 17kn
- Air
- 29°C
Tap a day for sea, wind and water. Full forecast
Forecast: next 9 days
Full forecast- Tue 380, good
- Wed 480, good
- Thu 581, good
- Fri 673, good
- Sat 778, good
- Sun 877, good
- Mon 969, good
- Tue 1070, good
- Wed 1175, good
The site in five facts
- Down to 28 mits deepest
- From a boathow you get in
- Advancedand up
- Water 29 °Crash vest or 1 to 2 mm
- Faces NWswell 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 Advanced divers and up, by its depth against the depths each course trains to. Scored for Advanced divers.
| Day | Score | Sea | Wind | Gusts | Air |
|---|---|---|---|---|---|
| Tue 3Nov | 80, good | 0.0 mflat | 6 kn | 10kn | 29°C |
| Wed 4Nov | 80, good | 0.1 mflat | 5 kn | 10kn | 28°C |
| Thu 5Nov | 81, good | 0.1 mflat | 2 kn | 6kn | 28°C |
| Fri 6Nov | 73, good | 0.1 mflat | 8 kn | 11kn | 28°C |
| Sat 7Nov | 78, good | 0.2 mflat | 11 kn | 17kn | 28°C |
| Sun 8Nov | 77, good | 0.2 mflat | 9 kn | 15kn | 28°C |
| Mon 9Nov | 69, good | 0.2 mflat | 8 kn | 22kn | 27°C |
| Tue 10Nov | 70, good | 0.3 m | 12 kn | 17kn | 29°C |
| Wed 11Nov | 75, good | 0.4 m | 11 kn | 16kn | 27°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
- Tue 3 NovLow 03:11 −0.7 mHigh 16:00 +0.6 m
- Wed 4 NovLow 03:21 −0.6 mHigh 16:45 +0.3 m
- Thu 5 NovLow 03:14 −0.5 mHigh 17:37 +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
Green Rock 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 Green Rock
More diving near here
5 places
- Red Rock 0.5 km away
- Japanese Garden 0.7 km away
- Buoyancy 0.8 km away
- Twins 0.9 km away
- White Rock 1.6 km away
About
the place in full, sources, credits
About Green Rock
A reef dive. It goes down to 28 m. You get in from a boat. It suits Advanced divers and up, by its depth against the depths each course trains to. The coast faces NW: swell from the NW reaches it, and wind from the SE blows out to sea. 55 dive centres or shops within 10 km, the nearest 0.9 km away. The sea is about 28°C in January, its coldest month (3 mm wetsuit), and 31°C in May, its warmest (rash vest or 1 to 2 mm). The town to stay in is Koh Tao. Within 5 km we also list 1 wind sports spot and 13 dive sites.
- What it is Reef.
- How deep Down to 28 m.
- Getting in From a boat.
- Who it suits Suits Advanced divers and up, by its depth against the depths each course trains to.
- Dive centres 55 dive centres or shops within 10 km, the nearest 0.9 km away.
Water about 29°C: rash vest or 1 to 2 mm. Typical sea temperature for the time of year, not a forecast.
Visibility about 15 m. Typical for the time of year, estimated from ten years of NASA satellite water clarity, not a forecast. Clearest in Apr and Sep (about 20 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$1,150–US$2,290 each
about US$1,150–US$2,290 each · 6 nights, 2 sharing: flights, hire car, 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 USM, estimated from distance and season, changing at HKG, full-service airlines, with a hold bag | about US$886–US$1,850 |
| Hire car | 6 days, shared | about US$47–US$81 |
| Stay | 6 nights, a mid-range double, shared | about US$101–US$161 |
| Food | 7 days eating out | about US$114–US$208 |
| Total | about US$1,150–US$2,290 |
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: Koh Tao
Ad Links marked Ad may pay us if you book. You pay the same, and they never change a score. How we earn
about 10 min by car · 147 places to stay
about US$34/nightcountry average
About Koh Tao its beds, food and every spot near it
About US$34 a night is our estimate of the country's average 2-star double room that month: not each town's price, and not a quote. 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 27h 55m
About 27h 55m door to door from Chicago
Fly ORD → USM, changing at Hong Kong International Airport (HKG), then 1h 30m by road
Flights ORD → USM 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 Koh Tao · GetYourGuideDive gear hire in Koh Tao · GetYourGuide
Dive centres nearby
Nang Yuan Easy Divers 0.9 km
Goodtime Adventures 3.3 km
Mojo Divers 3.4 km
Blue Immersion 3.4 km
DJL (Davey Jones Locker) Diving 3.4 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
Animals divers and surveys have recorded within 2 km of this site in the last 15 years. A record says someone saw it here, not that you will.
Bluespotted ribbontail ray Taeniura lymmaRay
Seen in 7 records.
Chaetodon wiebeliButterflyfishes
Seen in 8 records.
Titan triggerfish Balistoides viridescens
Seen in 6 records.
Red-breasted wrasse Cheilinus fasciatus
Seen in 6 records.
Scissortail sergeant Abudefduf sexfasciatus
Seen in 5 records.
Pennant coralfish Heniochus acuminatus
Seen in 5 records.
Bluechin parrotfish Scarus ghobban
Seen in 5 records.
Streaked spinefoot Siganus javus
Seen in 5 records.
Siganus virgatusRabbitfishes
Seen in 5 records.
Blacktip grouper Epinephelus fasciatus
Seen in 4 records.
Pink skunk clownfish Amphiprion perideraion
Seen in 3 records.
Long-spined sea urchin Diadema setosum
Seen in 3 records.
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: iNaturalist Research-grade Observations; Programme CROMIS: carnet de plongée en ligne de la FFESSM-Observations d'espèces subaquatiques collectées par les utilisateurs de CROMIS; A photographically-vouchered global citizen science dataset of sea slugs (Mollusca: Heterobranchia) from the SEASLUG.WORLD platform since 2015. Credits
This week's visibility and the current no free forecast gives. Ask a dive centre before you book.
Saved: this link opens the same trip
The link holds the trip itself: nothing about you is kept. Check the forecast again before you book.