The Letterbox
Protected Area
Magharee Islands SPA
Why dive here
With 169+ marine species recorded in the area - including dolphins, dwarf minke whales, humpback whales, ocean sunfish (mola mola) and octopuses - The Letterbox offers some of West Coast's richest diving. Water ranges 8-17°C, warmest July, August, September.
Dropping into The Letterbox feels like a secret handshake with the Atlantic. It’s a narrow swim-through, just wide enough for a diver and their gear, leading you into a sheltered gully. We often spot conger eels tucked into the crevices and the occasional lobster patrolling the rocky floor. This site is a neat, straightforward dive, perfect for those looking for a short, interesting exploration rather than a deep blue adventure.
Safety Notes
Cold water this month (avg 14°C). Drysuit or thick wetsuit (7mm+) recommended.
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Conditions
Ocean conditions, forecast and tides for The Letterbox
The Letterbox Ocean Conditions
Monthly averages for The Letterbox, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (53.32, -9.66) (22km away)
October Averages
Sea Temperature
14°C
56°F · Range: 11.7–15.4°C
Air Temperature
12°C
54°F
Wind Speed
8.2 m/s
15.9 knots
Atmospheric Pressure
1007.4 hPa
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data
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