DivePlnr
    Siam Bay dive site
    reef
    5-20m
    Similan Islands, Thailand
    กำหนดพื้นที่เกาะราชาใหญ่ เกาะราชาน้อย ตำบลราไวย์ อำเภอเมืองภูเก็ต จังหวัดภูเก็ต

    Siam Bay

    Best months: Jan–May

    Protected Area

    กำหนดพื้นที่เกาะราชาใหญ่ เกาะราชาน้อย ตำบลราไวย์ อำเภอเมืองภูเก็ต จังหวัดภูเก็ต

    Why dive here

    With 173+ marine species recorded in the area - including blacktip reef sharks, eagle rays, giant moray eels, whale sharks and clownfish - Siam Bay offers some of Similan Islands's richest reef diving. Water ranges 29-31°C, warmest April, May, June.

    Best timeJan–May
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBlacktip Reef Sharks, Eagle Rays, Giant Moray Eels, Whale Sharks and Clownfish · 173+ species recorded
    Water29-31°C · warmest April, May, June
    CharacterReef dive · max 5-20m
    StandoutExceptional marine biodiversity

    Siam Bay is a good spot for a relaxed dive in the Similans. We often see leopard sharks resting on the sand patches here, along with plenty of Kuhl's stingrays tucked under the coral bommies. The shallower parts are calm, making it a comfortable introduction for newer divers getting used to the Similans' currents. It's an easy drift, usually, with a gentle slope.

    Typical Siam Bay Dive Profile

    5mSafety Stop0m5m max~60 min estimated bottom time

    Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.

    Today06:1418:1411h 59m daylightGolden hour 17:46

    Nearest Dive Centres to Siam Bay

    Dive shops near Siam Bay

    Aquasub

    18km away
    Phone

    Tommy’s Dive Center Phuket

    20km away
    Web
    Phone
    Courses

    Aum Scuba

    20km away
    Web
    Phone

    Amazing Phuket adventures

    20km away
    Web
    Courses

    Local Dive Thailand

    21km away
    Web
    Phone
    Courses
    Rental

    Nama Freediving Phuket

    21km away
    Web
    Phone
    Courses
    View all dive centres in Similan Islands

    Reviews for Siam Bay

    Sign in to write a review

    Conditions

    Ocean conditions, forecast and tides for Siam Bay

    Siam Bay Ocean Conditions

    Monthly averages for Siam Bay, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (8.1, 98.3) (6km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    30°C

    85°F · Range: 28.7–30.4°C

    Current Speed

    5.1 cm/s

    Direction: S (191.3°)

    Salinity

    29.75 PSU

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)

    Check travel advisory for Thailand

    Plan & book

    Ways to dive Similan Islands, from day trips to liveaboards.

    Day trips & courses

    via GetYourGuide

    Guided dives, courses and snorkel trips with instant booking.

    Find dive trips in Similan Islands

    Places to stay

    via Booking.com

    Hotels and dive resorts near Similan Islands.

    Search stays in Similan Islands

    Dive insurance

    Most travel insurance excludes or limits scuba. Check what you need before you go.

    Dive insurance explained

    Partner links: we may earn a commission if you book, at no extra cost to you. How we make money

    Where to Stay near Siam Bay

    Prices from Booking.com. We may earn a commission at no extra cost to you.

    Back to Similan Islands