Barren Arch
One of the main attractions at this dive site is the arch, which can be accessed from either the shallower entrance near the enclosed back or the deeper entrance towards the open end of the bay. Snorkelers can drop down into the arch or swim in from the bay side, where a shallow underwater reef lip at 2/3m separates the arch from the bay. This natural formation provides shelter for a variety of schooling fish, including blue and pink Maomao, Demoiselles, Koheru, and Mado.
As divers explore the arch, they will be amazed by the walls adorned with an abundance of marine life. Sponges, bryozoans, hydroids, and corals create a vibrant ecosystem, attracting fascinating creatures like crabs, eels, shrimps, and nudis. The endemic Jason Mirabilis Nudi is a special sight here.
After traversing the arch, divers can choose to follow the wall on their right shoulder back into the bay or venture further into deeper waters. Tech divers have the option to continue straight ahead. Along the entrance to the bay, large kelp-covered boulders welcome divers. The bay gently slopes up, revealing beautiful patches of pebble meadows covered in sea lettuce during the season. Triple fins, blennys, and even Octopus can be found in these patches, while stingrays rest in the open crack towards the back left corner. Maomao can often be seen using the smooth boulders as rubbing stones for cleaning parasites off themselves.
For safety stops, divers can utilize a ledge at the 5m mark. The bay provides excellent shelter and serves as a gathering point for salps, jellies, and occasional visits from seal pups during their season.
Exploring this dive site near Tawhiti Rahi in Northland, New Zealand is a must for any diver seeking a thrilling and diverse underwater adventure.
Diving Conditions Score for Barren Arch
Average conditions, be alert.
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Barren Arch
Depth
26m
Visibility
14m
Experience Level
Weather Conditions for Barren Arch
Wave Height
0.9m
Wind Speed
7.1 m/s
Water Temp
18.1°C
Visibility
46.44km
Cloud Cover
3%
Wave Period
10.3s
Air Temperature
16.1°C
Precipitation
0 mm
Dive Score Chart for Barren Arch
Best time to dive: 11:00 with score 7.800038969404186/10. Water conditions: Waves 0.88m, Wind 4.8 m/s.Best night dive time: 5:00 with score 6.499260606060605/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Optimal diving conditions at Barren Arch are affected by daylight hours. Sunrise occurs at 06:00 and sunset at 18:00, which impacts visibility and water temperature for scuba diving and snorkeling.
Score: 7.8/10
Waves: 0.88m (10.35s), Wind: 4.8 m/s
Score: 6.5/10
Waves: 1.02m, Wind: 13.4 m/s
Seasonal Analysis for Barren ArchAlpha
Historical patterns and best seasons for diving at Barren Arch
The dive score combines all factors to rate overall diving conditions throughout the year. Higher scores indicate better diving conditions.
Monthly Dive Score Analysis - Seasonal Diving Conditions
Higher values indicate better diving conditions
Seasonal DiveScore Chart
This chart displays monthly diveScore data throughout the year, showing seasonal patterns. The data is presented as a bar chart with an overlaid line graph.Dive scores range from 1 to 10, with 10 being optimal conditions.
Higher values indicate better diving conditions
Best Season for Barren Arch
Summer
Summer offers the warmest water temperatures and generally favorable conditions for all levels of divers.
Best Months for Barren Arch
Ideal Conditions for Barren Arch
Water Temp
18.7°C / 65.7°F
March
Visibility
12.0m / 39.4ft
May
Wave Height
1.8m / 5.9ft
December
Wave Period
8.0s
January
Seasonal Insights for Barren Arch
Barren Arch follows southern hemisphere patterns with March being the warmest month (18.7°C) and October the coldest (12.9°C). The calmest conditions typically occur in December with average wave heights of 1.8m and wave periods of 8.0s. The most comfortable wave conditions are in December with a low wave steepness ratio, creating gentler swells. January offers the longest wave periods (8.0s), creating more comfortable and predictable conditions for boat entries and exits. Ocean currents are slowest in January (0.5m/s) and strongest in January (0.5m/s). May is usually the driest month with 0.0mm of precipitation. For beginners, the best time to visit would be during December to February, when ocean conditions are calmer with long-period waves and currents are typically weaker. Experienced divers might enjoy the challenges and potentially better visibility during the shoulder seasons, with moderate currents that can improve marine life encounters.
Last updated: 1 min. ago - Jun 19, 2026