Middle Arch
The focal point of Middle Arch is, of course, the magnificent archway itself. It provides a shallow enough depth for Open Water divers to explore, while the encrusting walls and boulders offer a captivating environment to discover. From tiny nudibranchs to large stingrays, there is a plethora of marine life thriving in this area.
Fish enthusiasts will surely be delighted, as this site is frequently visited by patrolling Kingfish, Snapper, and Blue MaoMao. Moreover, the kelpy area beyond the archway holds even more surprises, such as Long and Short Tailed Stingrays. Don't forget to keep an eye out into the blue for a chance encounter with other fascinating marine creatures.
For the adventurous divers, a recommended route is to navigate through the archway, explore the bouldery area, and continue towards the drop off. From there, you can immerse yourself in the stunning views of the open ocean. If you prefer a comprehensive exploration, consider doing a full lap through the archway and around the point back to the starting point. Remember to head north through the arch and keep the reef on your left to avoid getting lost. However, be cautious of any currents and attempt the loop only when they are absent. If you choose to go in the opposite direction, be mindful not to miss the entrance back into the archway.
With its unique topography, ample marine life, and accessible depths, Middle Arch is undoubtedly one of the most intriguing dive sites in Poor Knights, New Zealand. Whether you are a beginner or an experienced diver, this site promises an exhilarating underwater adventure that will leave you in awe.
Diving Conditions Score for Middle Arch
Challenging conditions, for experienced divers only.
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Middle Arch
Depth
19m
Visibility
17m
Experience Level
Weather Conditions for Middle Arch
Wave Height
0.76m
Wind Speed
22.8 m/s
Water Temp
18.2°C
Visibility
10.3km
Cloud Cover
86%
Wave Period
8.4s
Air Temperature
14.3°C
Precipitation
0.1 mm
Dive Score Chart for Middle Arch
Best time to dive: 17:00 with score 7.2580243243243245/10. Water conditions: Waves 0.66m, Wind 16.6 m/s.Best night dive time: 18:00 with score 6.711472463768117/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Optimal diving conditions at Middle 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: 7.3/10
Waves: 0.66m (9.25s), Wind: 16.6 m/s
Score: 6.7/10
Waves: 0.66m, Wind: 18.4 m/s
Seasonal Analysis for Middle ArchAlpha
Historical patterns and best seasons for diving at Middle 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 Middle Arch
Summer
Summer offers the warmest water temperatures and generally favorable conditions for all levels of divers.
Best Months for Middle Arch
Ideal Conditions for Middle Arch
Water Temp
18.6°C / 65.5°F
March
Visibility
12.0m / 39.4ft
May
Wave Height
1.8m / 5.9ft
December
Wave Period
8.0s
January
Seasonal Insights for Middle Arch
Middle Arch follows southern hemisphere patterns with March being the warmest month (18.6°C) and October the coldest (12.7°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 17, 2026