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Shark Alley surfForecast / Great Barrier Island / New Zealand
12 Day Weather and Surf, issued 5 pm Tuesday 16 Sep 2025 NZST
Best Forecast Surf Conditions for Shark Alley this week:
The surf forecast for Shark Alley over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 23) at 6PM. The primary swell is predicted to be 1.3m and 7s period with a secondary swell of 0.9m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Shark Alley in the next 12 days are 2.0m 7s and forecast to arrive on Tuesday (Sep 23) at 6AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Friday (Sep 19) at 3AM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Tue 23rd Sep) | 4.5ft (1.3m) 7s |
| Best Surf | 6PM (Tue 23rd Sep) | 4.5ft (1.3m) 7s |
| Most Powerful | 6AM (Tue 23rd Sep) | 6.5ft (2.0m) 7s |
Table - best surf conditions forecast for Shark Alley over the next 12 days.
Short Range Forecast Light rain (total 4mm), mostly falling on Thu afternoon. Very mild (max 17°C on Thu afternoon, min 13°C on Tue night). Winds increasing (light winds from the NW on Wed afternoon, strong winds from the NW by Thu afternoon). | Days 3-6 Weather Summary Mostly dry. Very mild (max 15°C on Sun night, min 11°C on Sat morning). Winds increasing (light winds from the SE on Fri night, strong winds from the N by Sun night). | ||||||||||||||||||||||
Tue 16 | Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | |||||||||||||||||
| PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |||
Rating (10 max) | |||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||||
| Period(s) (?) | 13 | 12 | 12 | 12 | 11 | 6 | 7 | 8 | 7 | 6 | 6 | 5 | 4 | 5 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | ||
Wave (?)Graph  | |||||||||||||||||||||||
| Energy (?) | 21 | 18 | 18 | 18 | 9 | 153 | 363 | 146 | 32 | 23 | 12 | 46 | 40 | 59 | 143 | 224 | 223 | 319 | 349 | 372 | 517 | ||
Wind (km/h) | |||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | cross- off | cross | cross- off | cross | cross- off | cross- off | off | off | cross- off | cross- on | cross- on | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | ||
High Tide / height (m) | 2:44AM 2.05 | 3:24PM 2.09 | 3:50AM 2.04 | 4:29PM 2.12 | 4:54AM 2.06 | 5:25PM 2.17 | 5:51AM 2.11 | 6:14PM 2.22 | 6:42AM 2.16 | 6:59PM 2.26 | 7:27AM 2.20 | 7:40PM 2.26 | 8:09AM 2.22 | ||||||||||
Low Tide / height (m) | 8:30PM 0.72 | 8:50AM 0.66 | 9:35PM 0.73 | 9:57AM 0.68 | 10:38PM 0.72 | 11:00AM 0.66 | 11:34PM 0.68 | 11:54AM 0.63 | 12:23AM 0.64 | 12:41PM 0.59 | 1:06AM 0.60 | 1:23PM 0.56 | 1:46AM 0.57 | ||||||||||
Tue 16 | Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | |||||||||||||||||
| Sunrise | - | - | 6:15 | - | - | 6:13 | - | - | 6:11 | - | - | 6:11 | - | - | 6:09 | - | - | 6:07 | - | - | 6:05 | ||
| Sunset | 6:08 | - | - | 6:09 | - | - | 6:09 | - | - | 6:10 | - | - | 6:12 | - | - | 6:13 | - | - | 6:13 | - | - | ||
 |  |  |  | | |  |  | | | | | | | | |  | | |  |  | |||
Rain (mm) | - | - | - | - | - | - | 2 | 2 | - | - | - | - | - | - | - | - | - | - | - | 9 | 6 | ||
| Temp. °C | 16 | 13 | 14 | 15 | 15 | 16 | 17 | 14 | 13 | 14 | 12 | 11 | 12 | 13 | 14 | 14 | 15 | 15 | 15 | 15 | 16 | ||
| Feels °C (?) | 10 | 7 | 11 | 13 | 9 | 8 | 11 | 7 | 5 | 5 | 4 | 6 | 7 | 6 | 7 | 7 | 8 | 8 | 8 | 9 | 13 | ||
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Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Great Barrier Island
The wind is still offshore at Shark Alley (moderate winds from the WSW at MokohinauIslandAws 54 km from Shark Alley). 0.1m 12s groundswell from the NE with a 0.1m 13s groundswell from the N. 2 swells combining to make bigger set waves.
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Shark Alley surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Shark Alley Surf forecast
The above surf forecast table for Shark Alley provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Shark Alley can be found by selecting the local surf guide option on the grey menu. Our Shark Alley surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Shark Alley) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Shark Alley may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Shark Alley is 88 km (55 miles) from the city of Northshore. If you plan a holiday in Great Barrier Island, look for hotels and other accommodation in Northshore. Northshore has rooms for a wide range of budgets as well as car hire and transport links.
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