Portland Harbour
Protected Area
Chesil Beach and Stennis Ledges
Why dive here
With 176+ marine species recorded in the area - including blue sharks, dolphins, dwarf minke whales, humpback whales and ocean sunfish (mola mola) - Portland Harbour offers some of Cornwall & Devon's richest reef diving. Water ranges 10-18°C, warmest July, August, September.
Portland Harbour is a good spot for divers keen on wreck exploration without the open-sea conditions. You'll find a collection of scuttled vessels here, from small trawlers to the occasional warship, sitting on a sandy seabed. Visibility can be hit or miss, but on a good day, exploring these wrecks offers a solid outing, especially for those comfortable with overhead environments. It’s a solid choice for club dives or when other sites are blown out.
Nearest Dive Centres to Portland Harbour
Dive shops near Portland Harbour
Dive Beyond Limited
Old Harbour Dive Centre
Divers Down
Dorset Diving Services
Mayim Mermaid Academy
Dive academy
Reviews for Portland Harbour
Conditions
Ocean conditions, forecast and tides for Portland Harbour
Portland Harbour Ocean Conditions
Monthly averages for Portland Harbour, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (50.44, -2.73) (3km away)
October Averages
Sea Temperature
17°C
62°F · Range: 15.1–17.5°C
Air Temperature
13°C
56°F
Wind Speed
8.14 m/s
15.8 knots
Atmospheric Pressure
1011 hPa
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data
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