Surf Forecasts:
O'Neills Bay surf forecast from 16 Aug 2026:
- Best quality surf: Monday 24 Aug, 3AM (local time) - 4ft (1.2m), 16s period, WSW swell with glassy winds.
- Most powerful swell: Monday 17 Aug, 6AM (local time) - 10ft (3.0m), 15s period, SW swell with 3,538 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 3AM (local time) - 4.5ft (1.3m), 13s period with WSW swell.
Best Forecast Surf Conditions for O'Neills Bay this week:
The surf forecast for O'Neills Bay over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 3AM. The primary swell is predicted to be 1.3m and 13s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at O'Neills Bay in the next 16 days are 3.0m 15s and forecast to arrive on Monday (Aug 17) at 6AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Fri 21st Aug) | 4.5ft (1.3m) 13s |
| Best Surf | 3AM (Mon 24th Aug) | 4ft (1.2m) 16s |
| Most Powerful | 6AM (Mon 17th Aug) | 10ft (3.0m) 15s |
Table - best surf conditions forecast for O'Neills Bay over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about O'Neills Bay.
We got a long 16-day window, but the first part of it is a total write-off for clean waves. The wind is just no good for a paddle.
That first Monday, the 17th of August, we see a solid 10-foot SW groundswell with a very long 15-second period, but the wind is all over it from the SSE at 16 mph, making it a lumpy cross-chop. The energy is massive (3420), but it’s not for surfing. That afternoon the wind picks up even more, so forget it.
From Tuesday the 18th through to Sunday the 23rd of August, it's quiet and messy. Swell sits around 3 to 5 feet, but it’s cross-onshore or onshore and windy, leaving it choppy. The energy drops from about 1000 down to a weak 285 on that Saturday morning. With that strong wind and sloppy surf, some of those afternoons look more fun for a kite surfer than a paddle surfer.
Then the bomb arrives. Monday the 24th of August morning is the one. We’ve got a solid 10-foot SW groundswell with a very long 16-second period, and it goes glassy – just a slight air from the NE at 3 mph. The combined energy is a massive 8448. This is a heavy, powerful, clean groundswell. At this size, this advanced break will be dredging. It is for experts only. Expect a crowd, as it’s known to get busy.
That afternoon the wind shifts, so the morning window is it.
After that, the swell stays big but the wind gets messy. Tuesday the 25th sees 8 to 10-foot SW swell but with a cross-onshore wind, so it gets bumpy.
We get one more clean window on Wednesday the 26th of August. It’s a 10-foot SW swell with a 14-second period, and a light NNE breeze at 6 mph is blowing cross-offshore, keeping the faces clean. Still a big, expert-only wave.
From the 27th of August through to the 1st of September, it fades to a dribbly 3 to 6 feet. The winds are clean or light some mornings, but the energy is low. A couple of mornings deliver “clean” conditions, but the waves are just too small to get pumped about.
So the call is: wait for Monday the 24th if you’re an expert, or Wednesday the 26th for another solid session. The rest is a blowout or flat.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Sun night. Very mild (max 12°C on Tue night, min 8°C on Sun night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Very mild (max 14°C on Sat morning, min 10°C on Thu morning). Wind will be generally light. | ||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | WSW 14 | SW 13 | SW 12 | SW 13 | SW 15 | WSW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 14 | WSW 14 | WSW 14 | WSW 7 | WSW 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 3990 | 3420 | 2830 | 1889 | 1170 | 990 | 1204 | 907 | 791 | 1453 | 1126 | 921 | 599 | 472 | 379 | 357 | 253 | 152 | 208 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-on | cross-on | cross-on | cross | cross-on | cross | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on |
High Tide | 00:04AM2.89m | 12:27PM2.71m | 00:43AM2.71m | 1:07PM2.56m | 1:24AM2.50m | 1:51PM2.40m | 2:08AM2.30m | 2:41PM2.23m | 3:02AM2.12m | 3:45PM2.11m | 4:12AM2.00m | 5:03PM2.07m | |||||||
Low Tide | 6:23AM0.13m | 6:39PM0.27m | 7:03AM0.30m | 7:22PM0.47m | 7:45AM0.49m | 8:08PM0.67m | 8:31AM0.67m | 9:01PM0.85m | 9:28AM0.83m | 10:08PM0.97m | 10:37AM0.91m | 11:24PM0.99m | |||||||
 |  | |  | | |  | | | | | | | |  | | | | | |
 | — | 7:03 | — | — | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:56 | — | — |
 | — | — | 5:49 | — | — | 5:50 | — | — | 5:51 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — |
mm | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 9 | 9 | 10 | 11 | 11 | 11 | 12 | 10 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 14 | 14 | 14 |
Feels °C | 2 | 3 | 3 | 4 | 6 | 4 | 7 | 3 | 6 | 8 | 8 | 8 | 10 | 10 | 9 | 10 | 9 | 9 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | WSW 15 | SW 15 | SW 14 | WSW 14 | SW 13 | SW 12 | SW 13 | SW 15 | WSW 14 | WSW 14 | WSW 13 | WSW 13 | WSW 14 | WSW 14 | WSW 14 | WSW 14 | WSW 13 |
| kJ | 3990 | 3420 | 1761 | 1889 | 1170 | 990 | 1204 | 907 | 791 | 1453 | 1126 | 921 | 599 | 472 | 379 | 357 | 253 | 123 | 114 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | SW 18 | WSW 16 | SW 10 | — | — | — | — | SW 16 | — | — | W 23 | SW 21 |
| kJ | — | — | — | — | — | — | — | 157 | 475 | 213 | — | — | — | — | 130 | — | — | 10 | 108 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | SW 15 | — | — | S 5 | — | S 6 | S 6 | S 5 | — | — | — | — | W 4 | WSW 5 | WSW 6 | WSW 7 | WSW 7 |
| kJ | — | — | 2830 | — | — | 32 | — | 102 | 112 | 28 | — | — | — | — | 7 | 35 | 47 | 152 | 208 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 161 | 93 | 68 | 67 | 39 | 78 | 109 | 223 | 116 | 1 | 1 | 8 | 78 | 113 | 223 | 117 | 333 | 347 | 347 |
Best forecast wave conditions in Auckland | |||||||||||||||||||
Best forecast wave conditions in New Zealand | |||||||||||||||||||
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Information about the O'Neills Bay Surf forecast
The above surf forecast table for O'Neills Bay provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at O'Neills Bay can be found by selecting the local surf guide option on the grey menu. Our O'Neills Bay 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 (O'Neills Bay) 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 O'Neills Bay 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.
O'Neills Bay is 10 km (6 miles) from the city of Waitakere. If you plan a holiday in Auckland, look for hotels and other accommodation in Waitakere. Waitakere has rooms for a wide range of budgets as well as car hire and transport links.
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