Skomer Island
Wales (Pembrokeshire) · United Kingdom
Skomer Island in St Brides Bay is a National Nature Reserve above the waterline and one of Wales's most celebrated dive sites below it, famous for breeding cuttlefish aggregations in May and June that draw divers from across Britain. Grey seals haul out on the island's boulder beaches year-round and escort divers through kelp forest corridors with remarkable boldness. The tompot blenny — an expressive, curious fish with elaborate eye tufts — is so abundant here that it has become a signature species of the site, peering from every crevice.
Conditions
Depth
3 to 25 m
Open water and up
Current
Usually gentle
Can pick up on the edge
Visibility
8 to 15 m
Clearest in the calm season
Water
7 to 18°C
5mm wetsuit
Month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water (°C) | 8 | 7 | 7 | 8 | 10 | 12 | 14 | 15 | 14 | 12 | 9 | 8 |
| Vis (m) | 3 | 3 | 4 | 5 | 6 | 7 | 8 | 8 | 7 | 5 | 4 | 3 |
| Current | Strong | Strong | Moderate | Moderate | Moderate | Moderate | Gentle | Gentle | Moderate | Moderate | Strong | Strong |
Your chances of seeing each animal
Atlantic Grey Seal
Last confirmed Jul 4, 2026 · 80 records
Almost always
Nearly every dive
Razorbill
Last confirmed Jul 7, 2026 · 107 records
Almost always
Nearly every dive
Common Murre
Last confirmed Jul 7, 2026 · 130 records
Almost always
Nearly every dive
Atlantic Puffin
Last confirmed Jul 7, 2026 · 265 records
Very likely
Most dives
Tompot Blenny
Last confirmed Jun 15, 2026 · 5 records
Very likely
Most dives
Spiny Lobster
Last confirmed May 12, 2026 · 7 records
Very likely
Most dives
Common Cuttlefish
Last confirmed Sep 1, 2025 · 2 records
Sometimes
About 1 in 3 dives
Gear