Smögen's diving is defined by vertical rock faces dropping through cold, clear water into the Bohuslän archipelago. Walls and reefs dominate the site mix, most reached by boat. The marine life leans heavily on invertebrates: Brittle Star, Sea Star, and Orange-clubbed Nudibranch are encountered on almost every dive, while the signature species, European Common Cuttlefish and Harbor Seal, reward attentive divers. Most sites suit intermediate divers, though Boviken offers a sheltered shore entry for beginners.
Monthly water temperature across Smögen's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water temperatures climb slowly from spring into summer, peaking in August and September before dropping back through autumn. The warmest months offer the most comfortable diving, though a drysuit or thick wetsuit is advisable through much of the year. Currents are a factor at exposed sites such as Rågstuten nr. 2 and Stora Sundskär, so checking conditions before descent is wise.
8 operators
14 more sites to explore
Water temperature around Smögen ranges from about 4°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 Smögen; in the coldest months (about 4°C) step up to a drysuit.
Fin maps 26 sites in Smögen (26 scuba diving sites and 3 snorkelling spots, with some suited to both).
Across Smögen's dive sites, April, May, June, July, August and September are most often reported as the best months to visit.
Invertebrates dominate: Brittle Star, Sea Star, and Orange-clubbed Nudibranch appear across nearly every site. Rock Crab, Sea Hare, Common Lobster, and Conger Eel are also regularly encountered. The signature species are European Common Cuttlefish and Harbor Seal, both observation-backed sightings in the area.
A handful of sites cater to less experienced divers. Boviken is shore-accessible and shallow, combining natural reef with artificial structures in a forgiving environment. Virrholmarna, Lilla Knappan, and Torsöfläcken are also rated beginner-friendly, though they require boat access. The majority of Smögen's sites are pitched at intermediate level, with a few demanding advanced certification.
Nearly all sites require a boat, as they lie offshore among the Bohuslän archipelago islands. Boviken is the main exception, offering direct shore entry. Local operator Dyk-Leif AB provides boat-based access to the wider site network.
Walls make up the core of Smögen's diving, ranging from shallow entries to deep drops. Several sites combine wall and reef structure, and Kostersten adds kelp forest and seagrass habitat. Torsöfläcken stands out as a pinnacle, and Stora Sundskär incorporates a drift element for divers comfortable with moving water.
