The Turku Archipelago extends into the Baltic Sea south-west of Turku, and its five sites are all boat-access dives on wrecks and reefs. Depths range from eight to thirty-six metres, with sites such as the Park Victory requiring advanced certification due to depth and overhead sections, while shallower sites like the Helsingfors Wreck are rated for beginners. Visibility across the area is typically five to ten metres, with a torch recommended on most sites. Water temperatures stay near two degrees Celsius in winter and rise to the mid-teens at the surface in late summer, while deeper water stays cold throughout the year.
Monthly water temperature across Turku Archipelago's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Surface temperatures peak in late summer, but deep water stays cold year-round, and a drysuit is recommended for the majority of dives. The clearest visibility tends to coincide with stable late-summer conditions when thermal stratification limits mixing.
Water temperature around Turku Archipelago ranges from about 2°C in February to 15°C in August, based on satellite sea-temperature data for its dive sites.
In the warm season (about 15°C) a 7mm or semi-dry suit is comfortable in Turku Archipelago; in the coldest months (about 2°C) step up to a drysuit.
Fin maps 5 sites in Turku Archipelago (5 scuba diving sites).
Across Turku Archipelago's dive sites, May, June, July, August and September are most often reported as the best months to visit.
2 more sites to explore
