Blackrock
Why dive here
With 134+ marine species recorded in the area - including humpback whales and pufferfish - Blackrock offers some of Rarotonga's richest wreck diving. Water ranges 24-28°C, warmest February, March, April.
Blackrock feels like Rarotonga’s playful side. We love it because it’s an absolute maze of reef plateaus, all rising from the sandy bottom. You’re constantly finding new corners, new swim-throughs, and little hidden nooks. The coral bommies here are proper healthy, providing shelter for more than just your usual reef fish. Keep an eye out for the Granulated Drupe, they’re cool to spot. Our favourite part, though, has to be those shallow caverns at the end. That’s where you’re likely to see crayfish tucked away, and often a lionfish or two just hanging out. Sunlight shafts through the openings, creating these beautiful, shifting patterns on the rock – it’s a great place to just slow down and observe. Visibility averages around 18m, so you’ve got good scope to appreciate the details. This site is great for divers who enjoy exploring and don't mind a bit of a meander, rather than just cruising along a wall. It’s perfect for a second dive or if you just want something a little more chill with plenty to discover.
Safety Notes
Wreck site - avoid penetration without wreck diving certification. Watch for sharp metal and entanglement hazards.
Nearest Dive Centres to Blackrock
Dive shops near Blackrock
Cook Island Divers
Adventure Cook Islands
Chantal's Concierge on the Beach
Pacific Divers
Reviews for Blackrock
Conditions
Ocean conditions, forecast and tides for Blackrock
Blackrock Ocean Conditions
Monthly averages for Blackrock, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (-21.2, -159.82) (1km away)
October Averages
Sea Temperature
24°C
76°F · Range: 23.3–26°C
Air Temperature
22°C
72°F
Wind Speed
9.54 m/s
18.5 knots
Atmospheric Pressure
1016.5 hPa
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data
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