Olowalu Reef - Hawaii

Roche Zanana often gets billed as a beginner site, and sure, its 12-metre max depth makes it approachable, but we think that does it a disservice. This isn't just a shallow reef. It's a proper cave system, more of an underwater playground really. We love dropping down into those sand gullies, then ducking under rocky ledges and into tight swim-throughs. The real magic here is in the shadows. You'll find schools of sweepers, sometimes so dense they look like a shimmering curtain, hugging the cave ceilings. Keep an eye out for the smaller stuff too; we've spotted Emery's Pygmygoby and the colourful Zebra Eviota tucked into crevices. The Red lionfish are almost always lurking, looking incredibly dramatic against the darker rock. Our tip? Go slow. This site rewards patience. The visibility generally holds steady around 19m, making it easy to just drift and absorb the quiet, cool feel of the caves. It’s a site that proves shallower can still mean spectacular, and it’s a brilliant introduction to overhead environments without being intimidating.

Location
Hawaii, United States, North America
Coordinates
20.811700, -156.626200
Type
cave

Marine Protected Area: Offshore Island

Best Time to Dive in Hawaii

The warmest water temperatures in Hawaii occur in September, averaging 29.0°C. The coolest conditions are in March at 25.6°C.

Monthly Water Temperatures

  • January: 26.2°C
  • February: 25.7°C
  • March: 25.6°C
  • April: 26.0°C
  • May: 26.8°C
  • June: 27.6°C
  • July: 27.9°C
  • August: 28.5°C
  • September: 29.0°C
  • October: 28.6°C
  • November: 27.9°C
  • December: 27.2°C

Nearby Dive Sites in Hawaii

Nearest Dive Centres to Olowalu Reef

Marine Life in Hawaii

Home to 23 recorded species including 17 reef fish, 3 other, 2 sharks & rays, 1 whales & dolphins.

Notable Species

Recommended Packing List for Olowalu Reef

Based on average water temperature of 27.2°C, currents 9 cm/s.

  • Shorty or Rashguard - warm 27°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