27–30°CWater you can relax in
Warm all season, so a thin wetsuit is plenty. Many An Thới sites sit in the lee of the islands, with little current and easy entries from the boat.
An Thới islands · Season 2026–27Opens in November
Scuba DivingPhu Quoc
Warm water. Calm seas. Island season.
From November to April the islands off An Thới turn warm, clear and calm. We run small-group fun dives for certified divers and Discover Scuba sessions for first-timers — boat, gear, guide and lunch sorted. You bring a swimsuit.
PADI professionals
Max 4 divers per guide
English & Tiếng Việt
Season profile · An Thới
- Dive season
- Nov–Apr
- Visibility
- 10–20m
- Water
- 27–30°C
- Depth range
- 5–30m
Fun dives $95 · Discover Scuba $105 · no deposit
Scuba diving in Phu Quoc is best from November to April, when visibility reaches 10-20m and the water sits around 27-30°C. The An Thoi archipelago off the island's southern tip offers shallow coral reefs from 5 to 30m, macro life and calm, beginner-friendly conditions; sea turtles are now an occasional sighting. With Vietnam Underneath, a two-dive fun dive day is $95 USD and a Discover Scuba Diving session for first-timers is $105 USD, both including boat, equipment, guide and lunch.
- Diving season
- November - April
- Visibility
- 10-20m (15-20m December - March)
- Water temperature
- 27-30°C
- Depth range
- 5-30m
- Main dive area
- An Thoi archipelago (Hòn Rỏi, Hòn Thơm, Hòn Móng Tay, Hòn Gầm Ghì, Hòn Mây Rút); Hòn Đồi Mồi on the north-west coast
- Fun dive day (2 dives)
- $95 USD
- Discover Scuba Diving
- $105 USD
- Certification needed
- None for a try dive; Open Water for fun dives
- Minimum age
- 10 years
- Group size
- Max 4 divers per guide
Timing is everything
Vietnam has two dive seasons. This is the other one.
Phu Quoc faces the Gulf of Thailand, so it runs on the opposite clock to Nha Trang. The northeast monsoon that roughens the central coast from October leaves this side dry and calm. In May the southwest monsoon arrives, the swell builds and the boats rest until November.
Season 2026–27 · month by month
Jul
Aug
Sep
Now
OctNov
Dec
Jan
Feb
Mar
Apr
May
Jun
- Peak · 15–20 m vis
- Good diving
- Season opening
- Monsoon · no boats
Clearest water: December – March
Visibility typically reaches 15–20 m — the window photographers wait for.
Shoulder months: November & April
Good diving at either end of the season, handy if your trip lands there.
Diving all year?
Pair it with Nha Trang, which is in season from February to September.
See Nha Trang divingWhy Phu Quoc
Why choose Phu Quoc for scuba diving?
Warm water, gentle reefs and plenty of small life — without a long boat ride or a big learning curve.
27–30°C
5–25 mCoral gardens full of small life
Soft and hard coral from 5 m down. Slow down and the reef fills in: nudibranchs, seahorses, anemonefish and moray eels. Sea turtles still pass through — a lucky bonus, never a promise.
10+Easy for first-timers
Plenty of reefs sit between 5 and 12 m. No certificate? Discover Scuba takes you to a maximum of 12 m with a PADI instructor beside you all dive. Ages 10 and up.
Your dive day
One easy day. Two dives. Nothing to organise.
Here is how a day on the water runs. Tell us your hotel and we handle the rest.
- 01
Hotel pickup
From most Dương Đông and Long Beach hotels — about 40–60 minutes to An Thới harbour.
- 02
Board & brief
Gear fitted, site briefing and buddy checks while the boat runs 30–45 minutes out to the islands.
- 03
Dive one
A guided reef dive with no more than four divers per guide.
- 04
Lunch on board
Vietnamese lunch, drinks and a surface interval anchored between the islands.
- 05
Dive two
A second site chosen for the day’s conditions — usually shallower, with a long, easy bottom time.
- 06
Back by afternoon
Return to the harbour and your hotel, with photos from your dives.
Choose your day
Two ways into the water
Prices in USD, per person. Boat, full equipment, guide and lunch are always included.
Fun Dive Day
For certified divers
$952 dives
- Two guided dives at the An Thới islands
- Boat, full equipment & dive guide
- Vietnamese lunch & drinks on board
- Photos from your dives
- Open Water certification or equivalent
No experience needed
Discover Scuba Diving
Your first breath underwater
$105no certificate
- Briefing & shallow-water skills with a PADI instructor
- Instructor-led reef dive, max 12 m
- Boat, full equipment & lunch
- Photos from your dive
- Ages 10+, comfortable in the water
- No deposit — pay on dive day
- Free cancellation up to 24 h before
- Max 4 divers per guide
Want your own certificate?
PADI Open Water Diver
Dive with a buddy anywhere in the world — taught in Vietnamese or English. A Discover Scuba session can count toward it.
Where we dive
Phu Quoc dive sites
Tap a marker on the map for depth, level and what to expect, then read how the island groups compare.
Phu Quoc · Dive map
NSWE
GULF OF THAILAND
Quần đảo An Thới
An Thới archipelago
The island chain off Phu Quoc’s southern tip: Hòn Rỏi, Hòn Thơm, Hòn Khô, Hòn Mây Rút, Hòn Gầm Ghì, Hòn Móng Tay and Hòn Bườm. Most of it lies inside the Phú Quốc Marine Protected Area (about 40,900 ha), where strictly protected reef zones are closed to visitors and tourism is limited to designated points.
- From harbour
- 4–12 km
- By boat
- 30–60 min
- Season
- Nov–Apr
- Protected area
- Snorkel & scuba
- Calm shallow reefs
Hòn Móng Tay · Hòn Gầm Ghì · Hòn Mây Rút
The three-island circuit
The classic An Thới route, 11–12 km from the harbour and a gentle place to start. Hòn Móng Tay has calm, clear water and colourful coral below the rocks. At Hòn Gầm Ghì (also called Hòn Dăm Ngang) plate and large hard corals sit just 1–3 m below the surface. Hòn Mây Rút (Trong and Ngoài) adds a long white-sand beach and clear shallows.
- Depth
- 1–12 m
- Level
- Easy
- Good for
- First dives & snorkelling
- Plate corals
- Clear shallows
- White-sand beach
- First-time divers
Closer to the harbour
Hòn Rỏi & Hòn Thơm
Two islands 4–6 km from the harbour with named operator dive points. Hòn Rỏi: Roi East (to about 10 m, cuttlefish and glass shrimp) and Roi South (boulders, whip corals, sea fans). Hòn Thơm: North Pineapple Point (to 18 m, rocky bottom with coral) and South Pineapple Point (to 35 m, strong current, for experienced divers). The Sun World cable car also lands on Hòn Thơm, so clarity varies with boat traffic and construction.
- Depth
- 10–35 m
- Level
- Easy–advanced
- Good for
- Certified divers
- Whip corals
- Cuttlefish
- Boulders
- Current at South Point
Dry Island · Sail islet
Hòn Khô & Hòn Bườm
Two small rock islets in the south of the group. Hòn Khô (Dry Island) is a boat dive for certified divers — mostly hard coral with parrotfish and butterflyfish, and moderate to strong current. Hòn Bườm (Hòn Buồm, “Sail islet”) has no beach: snorkellers swim over plate, flowerpot and mushroom corals in water mostly 1–6 m deep.
- Depth
- 1–20 m
- Level
- Easy–moderate
- Good for
- Snorkellers & certified divers
- Hard coral
- Anemonefish
- Boat dive
- Snorkel
Bắc Đảo · Hòn Đồi Mồi, Hòn Thầy Bói, Hòn Bàng
North-west islands
A separate trip from the An Thới islands, outside the Marine Protected Area. Hòn Đồi Mồi (Turtle Island), opposite Bãi Dài, is a shallow reef of boulders, lettuce coral and anemones in calm water, to about 12 m; the turtles it is named for are now rarely seen. Hòn Thầy Bói and Hòn Bàng (Hòn Bần) are small islets 2–3 km off the coast, used for snorkelling. Gành Dầu, the rocky cape at the north-west tip, is a beach and fishing village rather than a dive site.
- Depth
- 3–12 m
- Level
- Easy
- Good for
- Calm, shallow dives
- Boulders
- Anemones
- Snorkel islets
- Calm water
Depths and levels are typical ranges published by Phu Quoc dive operators; conditions on the day decide which sites we dive.
Gallery
Phu Quoc, underwater
Reviews
Heard from our divers
Real Google reviews from people who have trained and dived with the Vietnam Underneath team.
- Live from Google Reviews
- A team of PADI professionals
- Taught in Vietnamese & English
Before you book
Phu Quoc diving: frequently asked questions
Season 2026–27 · Opens in November
Six calm months. Pick your day.
Send us your dates, your hotel and how many divers. We’ll reply with availability, pickup time and what to bring — no deposit needed.
- No deposit
- Free cancellation 24 h before
- Max 4 per guide
Related guides
Keep exploring diving in Phu Quoc
Guides, courses and articles to help you plan your dives in Phu Quoc and across Vietnam.
Scuba diving in Vietnam: full guideSeasons, visibility, costs and how every Vietnamese dive region compares.Scuba diving Nha TrangHon Mun marine park dive sites, the February–September season and prices.PADI Open Water Diver courseGet certified to dive independently, taught in English or Vietnamese.Try Dive experienceNever dived before? See what your first breath underwater looks like.An Thới dive site depth & difficulty indexSite-by-site depths, difficulty and what you can expect to see.All Vietnam dive sitesBrowse every dive site we run trips to, with depths and conditions.