DivePlnr
    Horsea Island dive site
    Cornwall & Devon, United Kingdom
    Portsmouth Harbour

    Horsea Island

    Best months: Jul–Sep

    Protected Area

    Portsmouth Harbour

    Why dive here

    With 176+ marine species recorded in the area - including blue sharks, dolphins, dwarf minke whales, humpback whales and ocean sunfish (mola mola) - Horsea Island offers some of Cornwall & Devon's richest diving. Water ranges 10-18°C, warmest July, August, September.

    Best timeJul–Sep
    WetsuitA 5mm wetsuit
    Marine lifeBlue Sharks, Dolphins, Dwarf Minke Whales, Humpback Whales and Ocean Sunfish (Mola Mola) · 176+ species recorded
    Water10-18°C · warmest July, August, September
    StandoutExceptional marine biodiversity

    Horsea Island is primarily a training site, offering a sheltered inland dive experience. We found visibility can be variable, but it’s generally calm, making it a good spot for skill practice or trying out new gear. You'll likely encounter a few curious flatfish or small crabs in the silty bottom. It’s ideal for newer divers or those looking for a relaxed, accessible dive without the challenges of coastal conditions.

    Today06:2117:2311h 2m daylightGolden hour 16:38

    Nearest Dive Centres to Horsea Island

    Dive shops near Horsea Island

    In2 Diving

    6km away
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    Andark Diving

    15km away
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    Sussex Diving & Leisure

    25km away
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    Courses

    Mulberry Marine Experiences CIC

    25km away
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    Rental

    Sunken Dreams Scuba Diving Academy

    36km away
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    Rental

    Abyss Scuba School

    38km away
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    Courses
    View all dive centres in Cornwall & Devon

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    Conditions

    Ocean conditions, forecast and tides for Horsea Island

    Horsea Island Ocean Conditions

    Monthly averages for Horsea Island, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (50.44, -2.73) (3km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    17°C

    62°F · Range: 15.1–17.5°C

    Air Temperature

    13°C

    56°F

    Wind Speed

    8.14 m/s

    15.8 knots

    Atmospheric Pressure

    1011 hPa

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data

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