Arorangi Passage - Rarotonga

Arorangi Passage on Rarotonga is one of those dives we return to time and again, despite its reputation for serious currents. We’ve had dives here where you practically fly through the passage, which is exhilarating but not for the faint of heart. It’s the smallest and shallowest of Rarotonga’s passages, dredged out recently for smaller boats, but don't let that fool you. The action here can be immense. Our favourite way to dive Arorangi is on an incoming tide. You can drift over the sandy bottom, spotting Ambon pufferfish poking out from crevices and the occasional snakehead cowrie clinging to the reef. The real magic, though, is on the outer reef walls. Here, the current often lessens, letting you explore the canyons and swim-throughs. We’ve found lionfish lurking in the shadows and small reef sharks patrolling the drop-off. Keep an eye out for humphead unicornfish schooling in the bluer water, their iridescent scales flashing as they navigate the flow. The coral here, particularly some robust staghorn, has really bounced back. This dive is definitely for those who enjoy a bit of drift and don't mind a strong workout. Expect to cover ground quickly and see a lot of fish activity, especially triggerfish and parrotfish, adapting to the surge.

Location: Rarotonga, Cook Islands, Central & South Pacific
Coordinates: -21.232100, -159.830800
Type: reef

Best Time to Dive in Rarotonga

The warmest water temperatures in Rarotonga occur in January, averaging 26.5°C. The coolest conditions are in December at 26.5°C.

Monthly Water Temperatures

January: 26.5°C (air: 24.8°C)
February: 26.5°C (air: 25.2°C)
March: 26.5°C (air: 25.5°C)
April: 26.5°C (air: 25.0°C)
May: 26.5°C (air: 24.2°C)
June: 26.5°C (air: 22.8°C)
July: 26.5°C (air: 22.3°C)
August: 26.5°C (air: 21.7°C)
September: 26.5°C (air: 22.0°C)
October: 26.5°C (air: 22.1°C)
November: 26.5°C (air: 22.6°C)
December: 26.5°C (air: 24.0°C)

Nearby Dive Sites in Rarotonga

Nearest Dive Centres to Arorangi Passage

Marine Life in Rarotonga

Home to 143 recorded species including 102 reef fish, 14 hard corals, 10 sea snails & nudibranchs, 7 sea cucumbers, 2 sea urchins, 2 starfish.

Notable Species

Swordfish (Xiphias gladius) - Reef Fish
Black sea cucumber (Holothuria atra) - Sea Cucumbers
Burrowing urchin (Echinometra mathaei) - Sea Urchins
Greenfish (Stichopus chloronotus) - Sea Cucumbers
Small giant clam (Tridacna maxima) - Clams & Mussels
Manini (Acanthurus triostegus) - Reef Fish
Surf Redfish (Actinopyga mauritiana) - Sea Cucumbers
Staghorn coral (Acropora lutkeni) - Hard Corals
Lemon Peel (Centropyge flavissima) - Reef Fish
Gendarme Fish (Acanthurus olivaceus) - Reef Fish
Prickly Redfish (Thelenota ananas) - Sea Cucumbers
Coral Blenny (Istiblennius edentulus) - Reef Fish
Parrotfish (Thalassoma lutescens) - Reef Fish
Sponsal Cone (Conus sponsalis) - Sea Snails & Nudibranchs
cowry (Monetaria moneta) - Sea Snails & Nudibranchs
Staghorn coral (Acropora nasuta) - Hard Corals
Staghorn coral (Acropora hyacinthus) - Hard Corals
Bottleneck Sea Cucumber (Holothuria (Thymiosycia) impatiens) - Sea Cucumbers
Frigid Cone (Conus frigidus) - Sea Snails & Nudibranchs
Pearl-spotted wrasse (Halichoeres margaritaceus) - Reef Fish

Recommended Packing List for Arorangi Passage

Based on average water temperature of 26.5°C.

Shorty or Rashguard - warm 26°C water needs minimal exposure protection
Mask - essential for every dive
Fins
BCD - buoyancy compensator
Regulator - your most safety-critical piece of gear
Dive Computer - tracks depth, time, and NDL
Surface Marker Buoy (SMB) - essential for boat pickups
Dive Torch - useful for crevices and colour at depth
Underwater Camera - capture your diving memories