Shetland's underwater character is defined by cold, clear water and a strong marine mammal presence. Harbor Seal and Gray Seal are encountered across the site mix, and Orca appears on an occasional basis. The sites divide between a handful of dedicated dive spots and a larger collection of snorkel sites, giving the islands a particular appeal for surface-based exploration. Expect cold water year-round, with the warmest conditions arriving in summer.
Monthly water temperature across Shetland's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Water temperatures remain cold throughout the year, sitting at their lowest from winter through to late spring and rising only modestly through summer. The warmest window for diving falls in late summer, when conditions are at their most comfortable. Divers should plan around this seasonal peak and be prepared for cold exposure at any time of year.
10 more sites to explore
Water temperature around Shetland ranges from about 8°C in January to 13°C in August, based on satellite sea-temperature data for its dive sites.
In the warm season (about 13°C) a 7mm or semi-dry suit is comfortable in Shetland; in the coldest months (about 8°C) step up to a drysuit.
Fin maps 10 sites in Shetland (3 scuba diving sites and 8 snorkelling spots, with some suited to both).
Harbor Seal is the most reliably encountered species and is observed across the region's sites. Gray Seal and Orca are seen on an occasional basis. The species list also includes Catshark, Monkfish, Gurnard, John Dory, Skate, Lumpfish, Jorunna Nudibranch, Gorgonian, and King Crab, among others.
The cold water and exposure characteristic of Shetland's dive sites mean the region is better suited to divers with some cold-water experience. That said, the larger number of snorkel sites makes Shetland very accessible for those not yet diving. Anyone entering the water should be prepared for cold conditions regardless of skill level.
Snorkel sites make up the clear majority of Shetland's total offering, with a smaller number of dedicated dive sites and one site suitable for both activities. This balance makes Shetland particularly strong for snorkelling, where encounters with Harbor Seal and Gray Seal are a realistic highlight. Divers have fewer dedicated sites to choose from but access species and depth not reachable from the surface.
There is currently one operator listed for the region: Lunna Kirk Preservation Group. Given the limited operator provision, it is worth contacting them well in advance to check availability and any logistical requirements for accessing dive sites.
