Bornholm, Denmark
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    Trekroner fortet

    Best months: Jul–Sep

    Protected Area

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    Why dive here

    With 66+ marine species recorded in the area - including jellyfish lake - Trekroner fortet offers some of Bornholm's richest diving. Water ranges 3-18°C, warmest July, August, September.

    Best timeJul–Sep
    WetsuitA 5mm wetsuit
    Marine lifeJellyfish Lake · 66+ species recorded
    Water3-18°C · warmest July, August, September

    Trekroner Fortet offers a glimpse into Denmark’s military past underwater. Divers can explore the fort’s remains, a mix of brick and stone structures now colonised by local marine life. It’s a compelling site for those interested in wreck or historical diving, with crabs and small fish making their home in the crevices. We'd suggest it for divers looking for something a bit different from a natural reef.

    Safety Notes

    Cold water this month (avg 14°C). Drysuit or thick wetsuit (7mm+) recommended.

    Today06:3217:2210h 50m daylightGolden hour 16:31

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    Conditions

    Ocean conditions, forecast and tides for Trekroner fortet

    Trekroner fortet Ocean Conditions

    Monthly averages for Trekroner fortet, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (54.94, 13.85) (7km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    14°C

    57°F · Range: 11.7–16.3°C

    Air Temperature

    12°C

    53°F

    Wind Speed

    8.16 m/s

    15.9 knots

    Atmospheric Pressure

    1013.3 hPa

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

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