Kosterhavet Marine Park
Protected Area
2000583 Kosteröarna
Why dive here
With 121+ marine species recorded in the area - including dolphins, dwarf minke whales, humpback whales, orcas and seals & sea lions - Kosterhavet Marine Park offers some of West Coast (Gothenburg)'s richest reef diving. Water ranges 3-18°C, warmest July, August, September.
Okay, let's talk Kosterhavet. Forget your tropical expectations; this is a different kind of beautiful. Sweden's only marine national park delivers something truly unique: genuine cold-water coral reefs, specifically the *Lophelia pertusa*. We love how unexpected that is. Dropping into 15-20 meters, you start to see these delicate, branching structures emerge from the gloom, looking like alien trees. The visibility here can be decent, especially in late summer, but it's never going to be 30 meters of gin clear. Instead, you get this evocative, slightly mysterious green-blue light filtering through the bladder wrack near shore, opening up to the deeper reefs. You'll spend most of your time between 15 and 30 meters, navigating around the coral, looking for the smaller life that calls it home. Keep an eye out for Forbes sea stars clinging to the branches and the odd sea mouse trundling along the sandy patches. We've also spotted plenty of Hooded Shrimp if you have a keen eye. This site is definitely for the intermediate diver who appreciates the subtle beauty of cold-water environments and wants to tick off a genuinely unique dive experience.
Typical Kosterhavet Marine Park Dive Profile
Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.
Safety Notes
Cold water this month (avg 13°C). Drysuit or thick wetsuit (7mm+) recommended.
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Conditions
Ocean conditions, forecast and tides for Kosterhavet Marine Park
Kosterhavet Marine Park Ocean Conditions
Monthly averages for Kosterhavet Marine Park, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (57.57, 11.03) (3km away)
October Averages
Sea Temperature
13°C
56°F · Range: 10.6–15.8°C
Air Temperature
10°C
50°F
Wind Speed
6.56 m/s
12.8 knots
Atmospheric Pressure
1010.2 hPa
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data
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